dsdcu

30451-101A-MOD Issue D

July 2001

Tel. 800-433-3433

510-523-6000

Fax. 510-523-6150

1151 Harbor Bay Parkway Alameda, California

94502-6511 USA

Channel Card 30451-101A

DSDCU Dual Synchronous Data Channel Unit

USER’S MANUAL

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PUBLICATION RELEASE RECORD

Publication Number: 30451-101A-MOD

Publication Name: DSDCU User’s Manual

Hardware Module Numbers: 30451-101A

Hardware Revision Level: See Product Description Page

DATE ISSUE ECO NO. REASON FOR CHANGE

Feb. 1998 A -- Initial release of user’s manual.

Jan. 1999 B 302-123 Corrected and reformatted manual.

July 2001 C Updated Product Description page to reflect CCU compatibility listing

February 2002 D 302-267 Updated cover and warranty page

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Product Description Coastcom Dual Synchronous Data Channel Unit (DSDCU) User's Manual Coastcom’s Dual Synchronous Data Channel Unit (DSDCU), occupying one physical card slot in a D/I Mux III shelf, provides two distinct data service ports that allow high-speed, bi-directional, synchronous data transfer over a T1 network. Each channel is independently mappable to either the T1-1 or T1-2 direction. The DSDCU provides LAN-WAN-LAN connectivity, and concentrates and transfers large amounts of data for computer-to-computer, CAD/CAM, high-speed facsimile, compressed video, and WAN communications. The DSDCU includes 56/64 x N capability, using RS-422/449, V.35, RS-232E, and EIA 530A data interfaces. The DSDCU enables interface of Data Terminal Equipment (DTE) or Data Communications Equipment (DCE) synchronous data with Coastcom’s D/I Mux III multiplexer system.

Multiplexer Requirement: Model: D/I Mux III Software version numbers for Control Units should be: • Common Control Unit (CCU) (30305-108) 8.8 (or above) • Common Control Unit (CCU) (30305-110) 1.9 (or above) • ALPS CCU (30305-109) 9.8 (or above) • Multiplexer Control Unit (MCU) (40305-103) 1.8 (or above) • Advanced Multiplexer Control Unit (AMCU) (40305-104) 1.8 (or above)

DSDCU Module Number: 30451-101A

Revision: A (or above)

The model and revision number of the CCU, MCU, or AMCU may be found either on the front panel or remotely by querying the multiplexer with the DC (Display shelf Configuration) command. If not operating with the specified (or a later) revision, an upgrade kit is required. Contact Coastcom at 1-800-433-3433 for further information.

All equipment specifications subject to change without notice.

Copyright 1999 by Coastcom. All Rights Reserved. Printed in the United States of America. No Coastcom document, or parts thereof, may be reproduced in any form without prior written permission from Coastcom except where otherwise noted. The information in this manual is subject to change without notice. D/I Mux III is a Trademark of Coastcom.

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DSDCU User’s Manual This User’s Manual is designed for use with other product-specific manuals, and is intended for use by technical planners as well as operation and installation personnel. Refer to the D/I Mux III System User’s Manual (P/N 30305-108-MOD) for further information on Coastcom’s D/I Mux III System. The DSDCU User’s Manual is organized in the following order:

• Table of Contents

• Product Overview

• Applications

• Installation

• Configuration

• Diagnostics

• Appendices

• Index.

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Regulatory Information FCC Notice Federal Communications Commission (FCC) Part 15 Regulation For Telephone Equipment NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. IMPORTANT: This product was tested for FCC compliance under the conditions that included the use of shielded cables and connectors between system components. Changes or modifications to this product not authorized by the manufacturer could void your authority to operate this equipment.

FCC REQUIREMENTS NOTE: FCC Part 68 rules require the following information to be included in this publication. Some information may not be relevant to Coastcom equipment. General Information Regarding The Use Of Customer-Provided Telephone Equipment FCC regulations and telephone company procedures prohibit connection of customer-provided equipment to telephone company-provided coin service central office implemented systems. Connection to party line service is subject to State tariffs. If you have any questions about your telephone line, such as how many pieces of equipment you can connect to it, the telephone company will provide this information upon request.

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INFORMATION FOR CANADIAN CUSTOMERS Equipment Attachment Limitations (Canada Only): CP-01, Part I, Section 10.1 NOTICE: The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment also must be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations. Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment. Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. CAUTION: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate. CP-01, Part I, Section 10.2 NOTICE: The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the LN (Load Numbers) of all the devices does not exceed 100.

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TABLE OF CONTENTS CHAPTER 1. PRODUCT OVERVIEW......................................................................... 1-1 DSDCU Features .......................................................................................................... 1-1 DSDCU Operation ........................................................................................................ 1-2

DSDCU Timing.................................................................................................. 1-3 Circuit Description......................................................................................................... 1-4

Microcontroller ....................................................................................... 1-4 Front Panel Indicators ........................................................................... 1-4 PCM Backplane Interface...................................................................... 1-4 CMOS Parallel FIFOs............................................................................ 1-4 Serial I/O Interface and Data Ports ....................................................... 1-4 Internal BERT........................................................................................ 1-5

CHAPTER 2. APPLICATIONS .................................................................................... 2-1 LAN-WAN-LAN Application........................................................................................... 2-1 CAD/CAM Application................................................................................................... 2-2 High-Speed Data Concentrator Application .................................................................. 2-3 High-Speed Videoconferencing Application.................................................................. 2-4

CHAPTER 3. INSTALLATION ................................................................................... 3-1 Handling Procedures to Prevent Electrostatic Damage................................................ 3-1 Installing the Card into the Shelf ................................................................................... 3-1 Removing the Line Card ............................................................................................... 3-2 DSDCU Jumper Configuration...................................................................................... 3-3 DSDCU Connections and Cable Requirements ........................................................... 3-6

DCE-to-DTE Cabling With V.35 Interface.............................................. 3-7 DCE-to-DTE Cabling With RS-422/449 Interface.................................. 3-10 DCE-to-DTE Cabling With RS-232E Interface ...................................... 3-13 DCE-to-DTE Cabling with EIA-530 Interface ........................................ 3-16

Cable Lengths ................................................................................................... 3-19 RS-232E Interface Cable........................................................... 3-19 RS-422/449, V.35, & EIA-530 Interface Cable .......................... 3-20 Extended Cable Lengths ........................................................... 3-21 Recommended Cable Types ................................................ 3-22

LED Indicators .......................................................................................... 3-22

CHAPTER 4. SOFTWARE CONFIGURATION ........................................................... 4-1 DD - Displaying Line Card Configuration Data ...................................... 4-2 DSDCU Configuration Matrix................................................................. 4-4 SL - Setting Line Card Configuration..................................................... 4-5

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Labeling the Card Slot ........................................................................... 4-5 Selecting Port Mode .............................................................................. 4-6 Enabling the Carrier Group Alarm Feature............................................ 4-6 Enabling the Polling Feature ................................................................. 4-7 Enable RTS Operation .......................................................................... 4-7 Enabling the Clear To Send Delay Option............................................. 4-8 Enable RLSD Feature ........................................................................... 4-8 Applying Changes ................................................................................. 4-9 Mapping................................................................................................. 4-9

CHAPTER 5. DIAGNOSTICS...................................................................................... 5-1 Hardware Troubleshooting .................................................................... 5-1 Diagnostics............................................................................................ 5-1 Test Loop Operation Modes.................................................................. 5-1

Equipment Data Loop (Local Loopback) ................................... 5-2 Send Remote Loop Code (Remote Network Loopback) .......... 5-3 Send Remote Loop Code w/Test Sent ...................................... 5-4 Network Data Loop (Local Network Loopback) ......................... 5-5

Equipment Interface Loop (Line Loopback) .................................................................. 5-6 OL - Operate Line Card Diagnostics............................................................................. 5-7 Displaying BERT Results.............................................................................................. 5-8 Alarm Conditions........................................................................................................... 5-9 APPENDIX A. SPECIFICATIONS ............................................................................... A-1 Data Interfaces.............................................................................................................. A-1 Bandwidth Occupancy .................................................................................................. A-1 Maximum Connecting Cable Length............................................................................. A-1 Recommended Cable Types ........................................................................................ A-1 Operating Temperature................................................................................................. A-2 Relative Humidity .......................................................................................................... A-2 Reliability .............................................................................................................. A-2 Power Requirements .................................................................................................... A-2 Jitter Tolerance ............................................................................................................. A-3 RTS to CTS Delay ........................................................................................................ A-3 RTS Operation .............................................................................................................. A-3 Error Performance ........................................................................................................ A-3 Performance Without Input Signal ................................................................................ A-3 DTE/DCE Connection ................................................................................................... A-3 Protection .............................................................................................................. A-4

LIST OF FIGURES Figure 1-1 DSDCU Circuit Block Diagram .................................................................. 1-5

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Figure 2-1 LAN-WAN-LAN Application ....................................................................... 2-1 Figure 2-2 Engineering/Manufacturing CAD/CAM Application ................................... 2-2 Figure 2-3 DSDCU in a Data Concentrator Application .............................................. 2-3 Figure 2-4 High-Speed Videoconferencing Application .............................................. 2-4 Figure 3-1 DSDCU Front Panel .................................................................................. 3-2 Figure 3-2 DSDCU Printed Circuit Board with Jumper Block Locations .................................................................... 3-3 Figure 3-3 Jumper Block W3 Setup Illustration.......................................................... 3-4 Figure 3-4 Jumper Block W5 Setup Illustration.......................................................... 3-4 Figure 3-5 V.35 Interface Cable Pinout for Internal Timing Mode ................................................................................. 3-7 Figure 3-6 V.35 Interface Cable Pinout for External 1 Timing Mode ............................................................................. 3-8 Figure 3-7 V.35 Interface Cable Pinout for External 2 Timing Mode ............................................................................. 3-9 Figure 3-8 RS-422/449 Interface Cable Pinouts for Internal Timing Mode ................................................................................ 3-10 Figure 3-9 RS-422/449 Interface Cable Pinout for External 1 Timing Mode ............................................................................. 3-11 Figure 3-10 RS-422/449 Interface Cable Pinout for External 2 Timing Mode ............................................................................. 3-12 Figure 3-11 RS-232E Interface Cable Pinout for Internal Timing Mode ................................................................................ 3-13 Figure 3-12 RS-232E Interface Cable Pinout for External 1 Timing Mode ............................................................................. 3-14 Figure 3-13 RS-232E Interface Cable Pinout for External 2 Timing Mode ............................................................................ 3-15 Figure 3-14 EIA-530 Interface Cable Pinout for Internal Timing Mode ................................................................................ 3-16 Figure 3-15 EIA-530 Interface Cable Pinout for External 1 Timing Mode ............................................................................ 3-17 Figure 3-16 EIA-530 Interface cable Pinout for External 2 Timing Mode ............................................................................ 3-18 Figure 3-17 Receive Clock Generates Internal Transmit Clock.................................... 3-21 Figure 3-18 Receive Clock Uses An External Transmit Clock..................................... 3-21 Figure 4-1 Display Line Card Data Command Screen............................................... 4-2 Figure 4-2 DSDCU Display Line Card (DD) Screen................................................... 4-3 Figure 4-3 DSDCU Configuration Matrix.................................................................... 4-4 Figure 4-4 Set Line Card Configuration: Slot Number Prompt Screen ........................................................................................... 4-5 Figure 4-5 Setting the Slot Label Screen ................................................................... 4-5

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Figure 4-6 Port Mode Selection Screen..................................................................... 4-6 Figure 4-7 Carrier Group Alarm Feature Selection Screen........................................ 4-6 Figure 4-8 Polling Feature Option Selection Screen.................................................. 4-7 Figure 4-9 Enable RTS Operation ............................................................................. 4-7 Figure 4-10 Clear To Send Delay Option Selection Screen ........................................ 4-8 Figure 4-11 Enable RLSD Feature .............................................................................. 4-8 Figure 4-12 Apply Changes Screen............................................................................. 4-9 Figure 5-1 Equipment Data Loop (Local Loopback) .................................................. 5-2 Figure 5-2 Send Remote Loop Code (Remote Network Loopback) ................................................................................................. 5-3 Figure 5-3 Send Remote Loop Code w/Test Sent ..................................................... 5-4 Figure 5-4 Network Data Loop (Local Network Loopback) ........................................ 5-5 Figure 5-5 Equipment Interface Loop (Line Loopback).............................................. 5-6 Figure 5-6 Operate Line Card Diagnostics Screen .................................................... 5-7 Figure 5-7 BERT Display Screen............................................................................... 5-8

LIST OF TABLES Table 3-1 Interface Connections in Internal Timing Mode ......................................... 3-5 Table 3-2 Interface Connections for External Timing Modes..................................... 3-5 Table 3-3 Receive Clock and Data Path Select......................................................... 3-6 Table 3-4 Clock Timing Select ................................................................................... 3-6 Table 3-5 Maximum Data Rate Versus Various Cable Lengths for RS-232E Interface ................................................................................ 3-19 Table 3-6 Maximum Data Rate Versus Cable Length for RS- 422/449, V.35, and EIA-530 Interfaces In Internal Timing Mode ................ 3-20 Table 3-7 Front Panel LED Indicators........................................................................ 3-22

Chapter 1. Product Overview

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CHAPTER 1. PRODUCT OVERVIEW

Coastcom’s Dual Synchronous Data Channel Unit (DSDCU), occupying one physical card slot in a D/I Mux III shelf, provides two distinct data service ports that allow high-speed, bi-directional, synchronous data transfer over a T1 network. Each channel is independently mappable to either the T1-1 or the T1-2 direction.

The DSDCU provides LAN-WAN-LAN connectivity, and concentrates and transfers large amounts of data for computer-to-computer, CAD/CAM, high-speed facsimile, compressed video, and WAN communications. The DSDCU includes 56/64 x N capability, using RS-422/449, V.35, RS-232E, and EIA 530A data interfaces.

DSDCU Features The Dual Synchronous Data Channel Unit has two independent ports, which can interface Data Terminal Equipment (DTE), or Data Communications Equipment (DCE) synchronous data with Coastcom’s D/I Mux III. The DSDCU occupies only one physical channel slot in the D/I Mux III (or TIM III) shelf. Each port uses from 1 to 24 time slots (DS0s), of either the T1-1 (West) or the T1-2 (East) span. Each port can be mapped to the same T1 span or on separate T1 spans. Each port can drop and insert to and from the T1-1 or the T1-2 span.

High-speed synchronous data equipment can be interfaced to the DSDCU data port(s) at rates of 56 kbps x N, or 64 kbps x N, where N is a whole number between 1 to 24.

The 56 kbps x N mode of operating the DSDCU meets AT&T ones’ density requirements. For 56 kbps x N operation, there is a control bit that always will be in position 8. The 64 kbps x N mode of operation provides a clear channel that uses the whole bandwidth of each time slot (DS0). The 64 kbps x N mode should be used only in applications where the input data will have sufficient ones’ density, in fractional T1 applications, or when the B8ZS clear-channel feature is enabled.

The DSDCU ports can be configured as V.35, RS-422/449, RS-232E, or EIA-530 interfaces. Each port is transparent to the data, permitting operation with any protocol.

A microcontroller controls each data port allowing easy data rate selection, direction set-up, loop selection, CTS lead delay, and polling capability. Data activity monitoring and failure diagnostics are also possible by software control. Access to software controls is via the control port using a standard terminal emulator.

Dual Synchronous Data Channel Unit (DSDCU) User’s Manual

1-2

Convenient front panel Light Emitting Diodes (LEDs), arranged in a dual bank on the DSDCU, permit full-control lead status confirmation of Data Terminal Equipment (DTE) connection and operation, as well as loopback status. (Refer to Figure 3-1 for an illustration of the DSDCU front panel.) The DSDCU features local and remote loopback capability for convenient testing and diagnostics. Software control provides easy data-activity monitoring. A front panel LED indicates when the unit is in loopback mode. The DSDCU supports the following loopbacks: • Line Loop • Local Loop • Network Loop • Remote Loop • Remote Loop with Bit Error Rate Test (BERT).

DSDCU Operation

Each data port of the DSDCU operates as a DCE in the following manner: A transmit clock of 56/64 kbps x N is derived from the internal multiplexers, which transmit clock of 1.544 MHz. The transmit clock is sent to the associated Data Terminal Equipment (DTE). The DTE synchronously transmits serial data with the supplied transmit clock. This serial data is converted in the DSDCU to 8-bit words, which are then inserted into the PCM bitstream and out onto the T1.

On the receive side, the DSDCU converts the 8-bit words in the PCM bitstream to a continuous serial bitstream. The data port of the DSDCU forwards receive data and clock to the DTE.


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DSDCU Timing When working with synchronous circuits, all elements of the network need to be synchronized. For this reason, there are three modes of timing for the DSDCU: Internal Timing, External Timing 1, and External Timing 2.

• Internal Timing

During internal timing mode, the DCE provides the DTE with both the receive and transmit clocks derived from the network timing.

• External 1 Timing

In external timing mode 1, the DCE accepts the transmit clock from the DTE and sends the receive clock to the DTE. External timing mode 1 is recommended for longer cables or higher data rates.

• External 2 Timing

In external timing mode 2, the DCE accepts the transmit clock from the DTE. The DCE does not send timing to the DTE.

Note:

If External 1 or External 2 Timing is used in Slot-2 Sync Mode, only Port A of the DSDCU can send timing to the D/I Mux III.

Note:

The conversion from serial data to 8-bit words within the DSDCU does not maintain byte boundaries. The data is continuous but not byte-aligned; this means the DSDCU cannot serve as a bridge for applications requiring byte alignment from source to destination.


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Circuit Description

Microcontroller

The microcontroller controls the logic and timing circuits. It accepts control leads from the DTE and sends response signals back. The microcontroller accepts inputs control from the provisioning bus. It also does data-activity monitoring and failure diagnostics.

Front Panel Indicators

The microcontroller controls the LEDs on the front panel. The LED displays are driven by the CPU for indicating status and loopback information of the two synchronous data ports.

PCM Backplane Interface

The interface to the backplane PCM highway will be through the Logic Cell Array (LCA). The LCA accepts data, clocks, primary strobe, and secondary strobe from the backplane. In addition, the LCA sends out data, and return strobes.

CMOS Parallel FIFOs

Four FIFOs transfer the data between the DTE and network. Two DTE-to-network FIFOs (one for each port) are used to convert the DTE datastream to a rate in which the data can be inserted onto the T1 spans. Two network-to-DTE FIFOs (one for each port) are used to convert network data into a receive rate that can be accepted by the DTE.

Serial I/O Interface and Data Ports

The serial I/O interfaces through the multimode serial transceiver, which provides serial data port logic for V.35, RS-422/449, RS-232E, or EIA-530. The data port interface options are jumper-selectable and each data port can be configured differently. Data Port A has the physical connection on the back of the D/I Mux III, and data Port B has the physical connection on the front of the DSDCU. Communication between the DCE (DSDCU) and the DTE occurs at these two individual ports.

Note:


1-5

Any cable connected to Port B (the front connection) of the DSDCU must have two snap-on ferrite cores (Coastcom P/N 0180-0128) attached to it to prevent electromagnetic interference (EMI). These cores should be completely snapped shut, and placed six inches from the front panel of the DSDCU. The ferrite cores will be included in a bagged kit with the DSDCU.

Internal BERT

The DSDCU contains two internal Bit Error Ratio Test (BERT) chips, which are capable of accepting data and turning the data back onto the network. The chip measures the integrity of the span by implementing a 2047 test pattern. The BERT results are measured and can be read through the D/I Mux III terminal-emulation screen.

Circuit Block Diagram

FIFO for PortADTE to Network

CMOS ParallelFIFO

FIFO for PortANetwork to DTE

CMOS ParallelFIFO

FIFO for PortBDTE to Network

CMOS ParallelFIFO

FIFO for PortBNetwork to DTE

CMOS ParallelFIFO

Backplane Interface and Loopback

Logic Cell ArrayMicrocontroller

with Associated Memory

DTE to DCE Interface for PortA

Multi-Mode Serial Transceiver

DTE to DCE Interface for PortB

Multi-Mode Serial Transceiver

I/O Span A

I/O Span B

BERT forPortA

BERT forPortB

DTE-1 DTE-2

Figure 1-1 DSDCU Block Diagram

Chapter 2. Applications

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CHAPTER 2. APPLICATIONS

The DSDCU provides a synchronous data interface for point-to-point, mainframe-to-mainframe, compressed video, LAN-to-LAN, and LAN-to-WAN communications. With the addition of the RS-232E interface, the DSDCU accommodates CAD/CAM, high-speed data concentrator, and transfer applications via Frame Relay. Several DSDCU applications are illustrated and described in this chapter.

LAN-WAN-LAN Application Point-to-point applications include mainframe-to-mainframe connections, compressed video transmission, LAN-to-LAN and LAN-to-WAN connectivity. Bridges enable the connection of two or more LANs to form the LAN-WAN-LAN application illustrated in Figure 2-1.

Figure 2-1 LAN-WAN-LAN Application


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CAD/CAM Application To eliminate costly transport of data between facilities, the DSDCU provides a high-speed data link. This link facilitates Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM) by making a communication line continually available between engineering and manufacturing facilities. By setting the same data rates, and mapping to the same DS0 transmission channels, the DSDCUs at several different locations can communicate with one another efficiently and economically. Figure 2-2 illustrates the DSDCU in a CAD/CAM application.

Figure 2-2 Engineering/Manufacturing CAD/CAM Application

Chapter 2. Applications

2-3

High-speed Data Concentrator Application The complex process of inventory control at several remote locations may be significantly simplified by using the DSDCU as a high-speed data concentrator. When DSDCUs are installed at all remote inventory sites, instantaneous data is available on demand by the inventory-control central computer. Figure 2-3 illustrates a simplified application of high-speed data transfer between remotely located facilities.

Figure 2-3 DSDCU in a Data Concentrator Application


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High-speed Videoconferencing Application Videoconferencing may be conducted easily and cost effectively at several remote locations with the DSDCU. With DSDCU units (along with CODECs and video cameras) deployed at the various desired sites, videoconferencing is made available on demand by the videoconference central-control computer. Figure 2-4 illustrates a typical videoconferencing application.

Figure 2-4 High-speed Videoconferencing Application

Chapter 3. Installation

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CHAPTER 3. INSTALLATION This section covers the installation of the DSDCU. Inspect the equipment when it is received to make certain it is free of any shipping damage. If damage has occurred during shipment, make prompt claims directly to the shipping company, and inform Coastcom Customer Service.

Handling Procedures to Prevent Electrostatic Damage Take precautions to prevent electrostatic damage to plug-in modules. Electrostatic damage can cause semiconductors and other static-sensitive components to fail, resulting in test failures and degraded performance. To prevent electrostatic damage, follow the procedures listed below when installing and removing line cards.

Warning!

Power down the D/I Mux III shelf when installing or replacing channel cards. Ensure that the card being installed to the shelf is the correct card for that slot, or equipment damage can result.

Installing the Card into the Shelf 1. Put on a grounded wrist strap. The wrist strap should touch the skin, and be

grounded through a one-megohm resistor to the terminal block screw labeled GND on the D/I Mux III backplane.

2. With the line card still in its static-shielded bag, loosen the captive screw at the top of the front panel. Pull the top of the panel forward until it is at a right angle from its former position.

3. Using its front panel as a handle, remove the plug-in card from the static-shielded bag.

4. Configure all jumper blocks according to desired options—referring to Figures 3-3 and 3-4, and Tables 3-1 to 3-4. Jumper blocks must be set before installing the card into the D/I Mux III shelf.

5. Carefully insert the line card as far as it can go into the desired channel card slot in the D/I Mux III shelf.

6. Return the front panel to its upright position so that it is locked into the shelf, and make certain the card is securely seated in the card slot by firmly pressing on the front panel until it fully seats.

Note: After installing the DSDCU card, you MUST use the SL/SM software commands (see Chapter 4) to configure the card or it will not work.

7. Tighten the captive screw at the top of the front panel.


3-2

Figure 3-1 DSDCU Front Panel

Removing the Line Card Use the following procedures to remove the DSDCU line card from the D/I Mux III shelf. 1. Put on a grounded wrist strap. The wrist strap should touch the skin and

be grounded through a one-megohm resistor to the terminal block screw labeled GND (ground), on the D/I Mux III backplane.

2. Loosen the captive screw at the top of the front panel of the line card. 3. Pull forward the top of the front panel until it is at right angles from its

former position. 4. Slide the unit out of the card slot in the D/I Mux III shelf. 5. Replace the line card in its original static-shielded bag. 6. Return the front panel to its upright position, and tighten the captive screw.

DSDCU Jumper Configuration


3-3

All DSDCU line card functions and features are software-programmable. Features and functions are listed and explained in Chapter 4, Configuration. Jumper blocks located on the DSDCU card control the different DSDCU protocol-selection options and clock sourcing. Following are instructions for configuring these jumper blocks as appropriate for the desired interface and timing needed. Figure 3.2 depicts the DSDCU printed circuit board with all jumper block locations represented.

Figure 3.2 DSDCU Printed Circuit Board with Jumper Block Locations

The Interface (protocol) option is selected using Jumper Blocks W-3 (Port A) and W-4 (Port B). Table 3-1 shows the jumper settings for Interface Connections when operating in Internal Mode. Table 3-2 shows the jumper settings for Interface Connections when operating in the External Modes (External 1 or External 2). Rx Clock and Data Path selections are made using Jumper Blocks W-5 (Port A) and W-6 (Port B). Table 3-3 shows the jumper settings for Rx Clock and Data Path. Refer to page 1-3 for an explanation on Internal, External 1, and External 2 timing. Clock Timing selection is made using Jumper Blocks W-1 (Port A) and W-2 (Port B). Table 3-4 shows the jumper settings for Clock Timing Figures 3-3 and 3-4 illustrate the difference between in and out for the jumper settings as described in tables 3-1, 3-2, 3-3, and 3-4.


3-4

Figure 3-3 illustrates the jumper settings for Jumper Block W3 when the DSDCU will be operating in Internal Timing Mode with a V.35 Interface on Port A. The graphic on the left shows the jumpers in the correct position. The graphic on the right shows the table read out (in this case Table 3-1).

Figure 3-3 Jumper Block W3 Setup Illustration

Figure 3-4 illustrates the jumper settings for Jumper Block W5 to Select the Receive Clock and Data Path with a V.35 interface on Port A. The graphic on the left in Figure 3-4 shows the jumpers in the correct position. The graphic on the right in Figure 3-4 depicts the table read out (in this case Table 3-3).

Figure 3-4 Jumper Block W5 Setup Illustration


3-5

Table 3-1 Interface Connections in Internal Timing Mode

Jumper Table for Interface Connections for Jumper Block W3 (Port A) and W4 (Port B)

when operating in Internal Timing Mode V.35 RS-422/449 EIA-530 RS-232 Jumpers Jumpers Jumpers Jumpers

A Open Open Open Open B 1-2 2-3 2-3 1-2 C 2-3 2-3 2-3 1-2 D 2-3 2-3 2-3 1-2 E 2-3 2-3 2-3 1-2 F Open Open Open 1-2 G 2-3 2-3 2-3 1-2 H 1-2 1-2 2-3 2-3 I Open Open Open Open

Table 3-2 Interface Connections for External Timing Modes

Jumper Table for Interface Connections for Jumper Block W3 (Port A) and W4 (Port B)

when operating in External Timing Modes V.35 RS-422/449 EIA-530 RS-232 Jumpers Jumpers Jumpers Jumpers

A Open Open Open Open B 1-2 2-3 2-3 1-2 C 2-3 2-3 2-3 1-2 D 2-3 2-3 2-3 1-2 E 2-3 2-3 2-3 1-2 F 2-3 2-3 2-3 1-2 G 2-3 2-3 2-3 2-3 H 1-2 1-2 2-3 2-3 I Open Open Open Open


3-6

Table 3-3 Receive Clock and Data Path Select

Jumper Table for RX Clock and Data Path Select for Jumper Blocks W5 (Port A) and W6 (Port B)

V.35 RS-422/449 EIA-530 RS-232 Jumpers Jumpers Jumpers Jumpers

A 1-2 1-2 1-2 Open B 1-2 1-2 1-2 Open C Open Open Open 1-2 D Open Open Open 1-2

Table 3-4 Clock Timing Select

Jumper Table for Clock Timing Select for Jumper Blocks W1 (Port A) and W2 (Port B)

Internal External One External Two Jumpers Jumpers Jumpers

A Open Open 1-2 B 1-2 1-2 Open C 1-2 Open 1-2 D Open 1-2 Open

DSDCU Connections and Cable Requirements The DSDCU has two points of connection for equipment interface. Channel A connects through a DB-25 connector, which is located at the corresponding card slot position on the D/I Mux III shelf backplane. Channel B connects through a DB-25 connector, which is located on the DSDCU card front panel. If the DSDCU will be used as a single channel unit, backplane connection through Channel A is recommended.

Note:

Any cable connected to Port B (the front connection) of the DSDCU must have two snap-on ferrite cores (Coastcom P/N 0180-0128) attached to it to prevent electromagnetic interference (EMI). These cores should be completely snapped shut, and placed six inches from the front panel of the DSDCU. The ferrite cores will be included in a bagged kit with the DSDCU.


3-7

System integration requirements vary depending upon the types of equipment interfacing within the system. Particular connections are required in order for Data Communications Equipment (DCE) to properly interface with Data Terminal Equipment (DTE), and to successfully pass data. DSDCU connections include the following:

• DCE-to-DTE, with V.35 interface • DCE-to-DTE, with RS-422 interface • DCE-to-DTE, with RS-232E interface • DCE-to-DTE, with EIA-530 interface.

DCE-to-DTE Cabling with V.35 Interface Figures 3-5 through 3-7 illustrate the connections between the 25-pin D connector on the D/I Mux III data service panel and the 34-pin V.35 connector on the DTE.

Figure 3-5 V.35 Interface Cable Pinout for Internal Timing Mode


3-8

Figure 3-6 V.35 Interface Cable Pinout for External 1 Timing Mode


3-9

Figure 3-7 V.35 Interface Cable Pinout for External 2 Timing Mode


3-10

DCE-to-DTE Cabling With RS-422/449 Interface Figures 3-8, 3-9, and 3-10 illustrate the connections between the 25-pin D connector on the D/I Mux III data service panel and the DB-37 connector on the DTE.

ST/A 15ST/B 19RT/A 17RT/B 18CTS 5RTS 4

DSR 6

SG 7

RLSD 8

RD/B 16RD/A 3SD/B 14SD/A 2

5238

2697

11

37

13

246

224

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB37M

TM 11 18

1920

37

Figure 3-8 RS-422/449 Interface Cable for Internal Timing Mode


3-11

ST/A 15ST/B 19RT/A 17RT/B 18CTS 5RTS 4

DSR 6

SG 7

RLSD 8


17358

2697

11

37

13

246

224

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB37M

TM 11 18

1920

Figure 3-9 RS422/449 Interface Cable for External 1 Timing Mode


3-12

ST/A 15ST/B 19CTS 5RTS 4

DSR 6

SG 7

RLSD 8


173597

11

37

13

246

224

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB37M

TM 11 18

1920

Figure 3-10 RS422/449 Interface Cable for External 2 Timing Mode


3-13

DCE-to-DTE Cabling With RS-232E Interface Figures 3-11, 3-12, and 3-13 illustrate the connections between the 25-pin D connector on the D/I Mux III data service panel and the DB-25 connector on the DTE.

ST 15RT 17

CTS 5RTS 4

DSR 6

TM 11

RLSD 8

RD 3SD 2

1517

54

6

11

8

32

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

SG 7 7

Figure 3-11 RS-232E Interface Cable for Internal Timing Mode


3-14

ST 15RT 17

CTS 5RTS 4

DSR 6

TM 11

RLSD 8

RD 3SD 2

2417

54

6

11

8

32

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

SG 7 7

Figure 3-12 RS-232E Interface Cable for External 1 Timing Mode


3-15

ST 15

CTS 5RTS 4

DSR 6

TM 11

RLSD 8

RD 3SD 2

24

54

6

11

8

32

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

SG 7 7

Figure 3-13 RS-232E Interface Cable for External 2 Timing Mode


3-16

DCE-to-DTE Cabling With EIA-530 Interface Figures 3-14, 3-15, and 3-16 illustrate the connections between the 25-pin D connector on the D/I Mux III data service panel and the DB-25 connector on the DTE.

ST/A 15ST/B 19RT/A 17RT/B 18CTS/A 5

RTS/B 9

DSR/A 6

SG 7

RLSD/A 8


15121795

19

6

8

163

142

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

DSR/B 22 227

CTS/B 21 13RTS/A 4 4

RLSD/B 10 10

Figure 3-14 EIA-530 Interface Cable for Internal Timing Mode


3-17

ST/A 15ST/B 19RT/A 17RT/B 18CTS/A 5

RTS/B 9

DSR/A 6

SG 7

RLSD/A 8


24111795

19

6

7

8

163

142

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

DSR/B 22 22


RLSD/B 10 10

Figure 3-15 EIA-530 Interface Cable for External 1 Timing Mode


3-18

ST/A 15ST/B 19CTS/A 5

RTS/B 9

DSR/A 6

SG 7

RLSD/A 8


24115

19

6

7

8

163

142

FG 1 1

DCE (SDCU)DB25M

DTE (Terminal)DB25M

DSR/B 22 22


RLSD/B 10 10

Figure 3-16 EIA-530 Interface Cable for External 2 Timing Mode


3-19

Cable Lengths

DSDCU cable length requirements are determined by the selection of data rate, cable type, interface type, and timing source. In general, shorter cables are required at higher data rates. Cables designed for data transmission are required to meet specified transmission distances. Balanced interfaces operate over longer distances than unbalanced interfaces and certain timing options impose additional cable length restrictions.

RS-232E Interface Cable The EIA RS-232E specification is based upon a maximum data rate of 20 kbps, a maximum shunt capacitance of 2,500 picofarad (pf), and a maximum distance of 50 feet (assuming a cable capacitance of 50 pf/ft). The DSDCU RS-232E interface is designed to operate at rates of 56/64 Kbps x N, where N equals 1 to 3. It is also designed to use either high-capacitance (30 pf/ft) or low-capacitance (12 pf/ft) cable. Table 3-5 lists cable length requirements for the RS-232E interface, based upon capacitance and data rate.

Table 3-5 Maximum Data Rate Permitted With Various Cable Lengths for RS-232E Interfaces

Cable Lengths (Feet) High

Capacitance Low

Capacitance Data Rate

64/56kbps x N 15 50 N=1 5 20 N=2 - 5 N=3


3-20

RS-422/449, V.35, and EIA-530 Interface Cable When the DSDCU is set for internal timing mode, inherent cable delay results. Table 3-6 illustrates maximum frequency versus cable length permitted for RS-422, V.35, and EIA-530 interfaces while set for internal timing mode.

Table 3-6 Maximum Data Rate Versus Cable Length For RS-422/449, V.35, and EIA-530 Interfaces In Internal Timing Mode

Cable Length (Feet)

Maximum Baud Rate

64 Kbps x N 56 Kbps x N 15 64 Kbps x 24 56 Kbps x 24 20 64 Kbps x 23 56 Kbps x 24 30 64 Kbps x 22 56 Kbps x 23 40 64 Kbps x 21 56 Kbps x 20 50 64 Kbps x 17 56 Kbps x 17 60 64 Kbps x 15 56 Kbps x 16 70 64 Kbps x 13 56 Kbps x 15 80 64 Kbps x 12 56 Kbps x 14 90 64 Kbps x 11 56 Kbps x 13

100 64 Kbps x 11 56 Kbps x 12 150 64 Kbps x 7 56 Kbps x 9 200 64 Kbps x 6 56 Kbps x 7 250 64 Kbps x 5 56 Kbps x 6 300 64 Kbps x 4 56 Kbps x 5 350 64 Kbps x 3 56 Kbps x 4 400 64 Kbps x 2 56 Kbps x 4 500 64 Kbps x 2 56 Kbps x 3 600 64 Kbps x 1 56 Kbps x 3 700 64 Kbps x 1 56 Kbps x 2 800 64 Kbps x 1 56 Kbps x 1 900 64 Kbps x 1 56 Kbps x 1 1000 64 Kbps x 1 56 Kbps x 1


3-21

Extended Cable Lengths For longer cables, or higher data rates, External 1 timing mode (EXT 1) should be used. In External 1 timing mode, the DCE accepts transmit clock from the DTE, and sends receive clock to the DTE. In this mode, the DTE is synchronized to the network by using the receive clock as the transmit clock. There are two ways of implementing this: (1) the DTE uses the receive clock to generate the transmit clock internally, or, (2) the DTE also uses the receive clock as an external transmit clock, and sends it back to the DCE.

Figure 3-17 Receive Clock Generates Transmit Clock Internally

Figure 3-18 Receive Clock Uses an External Transmit Clock


3-22

Recommended Cable Types

RS-422/V.35/EIA-530: 24 gauge, 16 pf/ft, twisted-pair shielded cable (for example, Belden #9836).

RS-232E: High-capacitance, 24 gauge 30 pf/ft shielded cable

(for example, Belden #9617); or low-capacitance, 24 gauge, 12 pf/ft shielded cable (for example, Belden #9937).

LED Indicators Table 3-7 describes the Light Emitting Diode (LED) indicators applicable to the DSDCU channel card. The abbreviations noted in the columns entitled “Labeling” correspond to the legends found on the DSDCU front panel.

Table 3-7 Front Panel LED Indicators

LED Color Labeling Indication DS1 Yellow LPBK Loopback in progress DS2 Green TXD Transmit Data Active DS3 Green RXD Receive Data Active DS4 Green DSR Data Set Ready DS5 Green CTS Clear To Send DS6 Green DCD Data Carrier Detect

Chapter 4. Software Configuration

4-1

CHAPTER 4. SOFTWARE CONFIGURATION This chapter explains the procedures for configuring and operating the software used by the DSDCU card. The logical programming order for the DSDCU is detailed, with commands listed and explained individually. While commands are shown in uppercase bold type, both in the screen representations, and in the text of this manual, they may be entered in either upper or lower case. Except for the features enabled by jumper blocks referenced in Chapter 3, Installation, all other configuration selections are accomplished using software commands as detailed in this chapter.

A screen example follows each procedure description. Values shown in square brackets ([ ]) are default (current) values. If a value is changed, the new value appears in the brackets the next time that parameter is edited. The enter key, indicated by [Enter] in the text, must be pressed after each entry. To make corrections before pressing [Enter], backspace and retype entries. If an error is made during configuration selections, continue to make all selections as desired, Applying Changes at the end of the selection menu. Then, re-enter the configuration menu, correcting the error when it appears for edit. Apply Changes again to save the correction.

Thorough review of the configuration chapter of the D/I Mux III System User’s Manual is recommended for use in conjunction with the configuration instructions given here. Each function is accessed by a two-letter command shown on the Common Control Unit (CCU), or Multiplexer Control Unit (MCU) Main Menu screen of the D/I Mux III system. The first letter is usually D, to display current settings, or S, to set or modify them. Configure the DSDCU line card through the use of an asynchronous ASCII terminal (or equivalent) connected to the D/I Mux III. Configuration settings are stored in non-volatile Random Access Memory (NVRAM) on the CCU, and are used to reconfigure the line card in case of power loss. The stored settings also allow replacement line cards plugged into the same slot to be automatically configured upon installation.

Warning! Do Not enter a slash (/), a backslash (\), a colon (:), or CTRL-P while issuing commands. These are Coastcom’s proprietary Machine Machine Language (MML) commands and, if used, will cause a system lockup. In the event of such a lockup, press the ENTER key repeatedly, until the system responds, or cycle power on and then off again. System will respond upon power-up.


4-2

DD - Displaying Line Card Configuration Data After installing the DSDCU line card as directed in Chapter 3. Installation, and after accessing the Main Menu screen, access the Display line card Data screen by typing DD and pressing [Enter]. The DD command displays the configuration settings and status information for a specific channel card. The system prompts for entry of the slot number containing the line card selected for display. Because the DSDCU line card occupies slot 17 in this example, its configuration data will be displayed. Until reset by the user, the default values programmed into the DSDCU line card at the factory will remain in place. Accessing the Display line card configuration Data screen before configuring the DSDCU card will confirm correct slot position for the card. Some front panel Light Emitting Diodes (LEDs) will remain lit, indicating card inactivity until the card is mapped. Refer to mapping instructions in Chapter 4 of the D/I Mux III System User’s Manual.

] DD Slot Number (1..24) 17

Figure 4-1 Display Line Card Data Command Screen


4-3

After entering the DD command, the system will prompt for entry of the desired line card slot number. The screen then displays the current configuration data for that card. ] DD Slot Number [17] 14:05:10 --------- [ Slot 17 : SDCU-DP ] ----------- 05/06/96 Current Status Normal Model: 56/64K x N SDCU-DP Port-A Mode : 56K Port-B Mode : 64K T1-1 CGA Ignore : OFF T1-2 CGA Ignore : OFF Port-A Interface : V.35 Port-B Interface : V.35

T1 Data RTS/ CTS Enable Port Label Line Rate Poll Delay RTS TM CTS DSR RLSD ---- ------ ---- ---------- ---- ----- --- --- --- --- -------------- ---- ----- --- --- --- --- ------- ------- ---- A T1-1 112K (TR) OFF OFF ON ON ON ON ON B T1-2 64K (TR) ON ON ON OFF OFF OFF OFF

--- Hardware --- Serial Software Card Type Part Number Rev Number Revision ---------------------------------------------------------------------------------------------------------------------- DSDCU 30451-101 A 123456-7890 A 05/06/96 ----------------------------------------------------------------------------------------------------------------------

Figure 4-2 DSDCU Display Line Card Data (DD) Screen


4-4

DSDCU Configuration Matrix

Figure 4-3 DSDCU Configuration Matrix


4-5

SL - Setting Line Card Configuration Enter SL to set line card configuration. The system prompts for entry of the slot number in which the DSDCU resides.

] SL Enter Line Card Configuration Information Slot Number (17)

Figure 4-4 Set Line Card Configuration: Slot Number Prompt Screen

Labeling the Card Slot After the slot number is entered, the system will prompt for entry of a label for each of the DSDCU ports, as applicable. If no label is desired, press [Enter]. Avoid entering a slash, a backslash, or a colon when labeling the card slot. Use of any of these characters may cause a system lock-up as described earlier in this chapter. Slot labels are recommended for overall shelf and configuration management.

Set DSDCU Line Card Configuration Label for Slot 17, Channel A (up to 10 Characters) [Label 1] Label for Slot 17, Channel B (up to 10 Characters) [Label 2]

Figure 4-5 Setting the Slot Label Screen


4-6

Selecting Port Mode After completing slot labeling, the system prompts for selection of Data Rate mode for Ports A and B. Port A Mode 5) 56 K 6) 64 K [5] Port B Mode 5) 56 K 6) 64 K [5]

Figure 4-6 Port Mode Selection Screen

Enabling the Carrier Group Alarm Feature The Carrier Group Alarm (CGA) option allows the selection of a desired card response to a CGA event. If CGA is ignored, the DSDCU will continue to pass data as though no alarm event is present. To prevent data from being passed if there is a CGA event, the selection should be (0) None. During a CGA event, DSR and CTS are disabled. To enable the DSDCU to ignore CGA, select 1, 2, or 3 (as appropriate). Ignore CGA 0) None 1) T1-1 2) T1-2 3) Both [3]

Figure 4-7 Carrier Group Alarm Feature Selection Screen

Enabling the Polling Feature


4-7

The polling feature allows the DSDCU channel card to be used in the multidrop mode. To enable polling, enter 1, 2, or 3 (as appropriate). If polling is not desired, enter 0 (None).

When in the polling mode, the DSDCU responds to the Ready To Send (RTS) signal from the terminal by connecting to the network when RTS is high. Enable RTS/Polling Feature 0) None 1) Port A 2) Port B 3) Both [3]

Figure 4-8 Polling Feature Option Selection Screen

Enable RTS Operation The enable RTS option allows RTS to remain on. To enable RTS operation enter 1, 2, or 3 (as appropriate). If RTS operation is not desired, enter 0 (None). Enable RTS Operation 0) None 1) Port A 2) Port B 3) Both [3]

Figure 4-9 Enable RTS Operation


4-8

Enabling the Clear To Send Delay Option The Clear To Send (CTS) 8 ms delay option is provided in the event that a slight delay period is desired before passage of data. To enable this delay feature enter 1, 2, or 3 (as appropriate). To ignore this feature, press 0 (None). Enable ~10 ms CTS Delay 0) None 1) Port A 2) Port B 3) Both [3]

Figure 4-10 Clear To Send Delay Option Selection Screen

Enable RLSD Feature To enable the RLSD feature, enter 1, 2, or 3 (as appropriate). If the RLSD feature is not desired, enter 0 (None).

Enable RLSD Feature 0) None 1) Port A 2) Port B 3) Both [3]

Figure 4-11 Enable RLSD Feature


4-9

Applying Changes Once all configuration settings are completed as desired, the Apply Changes screen will appear. Selecting Y (Yes) saves all configuration settings as entered. Selecting N (No) returns all settings to where they were previously.

Apply Changes Y) Yes N)No [Y/N] Y

Figure 4-12 Apply Changes Screen

Mapping DS0 channel mapping must be performed for the DSDCU to become functional. Each channel must be mapped for Transmit and Receive. Mapping instructions are described in Chapter 4 of the D/I Mux III System User’s Manual.

Chapter 5. Diagnostics

5-1

CHAPTER 5. DIAGNOSTICS

This chapter describes hardware troubleshooting and loopback diagnostic testing for the DSDCU line card.

Hardware Troubleshooting The primary method of troubleshooting the DSDCU line card is to systematically replace units with new units, one at a time, according to observed or measured symptoms. After a unit is replaced, test as necessary to verify normal operation. If a replacement unit does not clear the trouble, remove it, and plug the original unit into the shelf before continuing with the troubleshooting process.

Field repair of plug-in units is not recommended. Return defective units to Coastcom.

Diagnostics DSDCU diagnostics are performed through the D/I Mux III system software, in conjunction with the Light Emitting Diodes (LEDs) located on the front panel of the DSDCU channel card.

Test Loop Operation Modes Several test loops are available that allow various portions of the DSDCU circuit to be tested. A remote loop code may also be sent which tests the transmission facility. Available loopback tests include Equipment Data Loop (Local Loopback), Send Remote Loop Code (Remote Network Loopback), Send Remote Loop Code w/Test Sent, Equipment Interface Loop (Line Loopback), and Network Data Loop (Local Network Loopback), Each loopback test is described below.

Note: For proper loopback test results, the Request To Send (RTS) control lead must be set to NONE (option 0) in the SL command screen.


5-2

Equipment Data Loop (Local Loopback)

The Equipment Data Loop connects Transmit Data (TX) to Receive Data (RX) on the DSDCU. The Equipment Data Loop tests the complete DSDCU. If both Data Communication Equipment (DCE) ports are multiplexed onto the same T1 line, data that is sent on both ports will be looped back.

Figure 5-1 Equipment Data Loop


5-3

Send Remote Loop Code (Remote Network Loopback)

The remote loop code is generated at the local end; received and detected at the far end. This loopbacks the data at the far-end DSDCU toward the originating DSDCU. An unloop code generated at the local-end DSDCU will remove the remote loop at the far end.

Figure 5-2 Send Remote Loop Code

Send Remote Loop Code with Test Sent


5-4

Send Remote Loop Code with Test Sent is the same as Remote Loop, however, a 2047 test pattern is generated to verify integrity of the span.

Figure 5-3 Send Remote Loop Code with Test Sent on Port A


5-5

Network Data Loop (Local Network Loopback)

The Network Data Loop connects Receive Pulse Code Modulation data (RX PCM) to Transmit Pulse Code Modulation data (TX PCM), in the direction of the network, providing loopback testing for the DSDCU PCM interface. If both ports are mapped onto the same T1 line that is performing the loopback, no data from the local DSDCU will be passed onto the line.

Figure 5-4 Network Data Loop on Port A


5-6

Equipment Interface Loop (Line Loopback)

The Equipment Interface Loop connects Transmit (TX) and Receive (RX) data, in the direction toward the Data Terminal Equipment (DTE). This occurs at the interface circuitry, providing loopback testing for the DCE interface of the DSDCU. If one of the DSDCU ports is in loopback mode, the other port may be operated normally, and not necessarily be in loopback mode.

Figure 5-5 Equipment Interface Loop on Port A


5-7

OL - Operate Line Card Diagnostics Software-controlled diagnostics are available for the DSDCU card through the Operate Line card diagnostics (OL) command. When performing diagnostics from the OL screen, simply type in the desired mode of operation, and press [Enter]. After completion of operations in test loop mode (selections 1, 2, 3, 4, 5 or 6, or B, C, D, E, F, or G, as appropriate), the DSDCU must first be returned to “0) Normal” mode of operation.

] OL 14:05:10 ---- [ Operate Slot 17 : SDCU-DP ] ---- 08/14/96 Current Status Normal Port A Port B 0) A) Normal (0)/(A) Both Ignore Loop Codes 1) B) Normal/Ignore Loop Codes 3) D) Send Remote Loop Code 4) E) Equipment Interface Loop 6) G) Remote Loop Code w/Test Sent T1-1 T1-2 2) C) Equipment Data Loop 5) F) Network Data Loop (Local) R) Reset Card Q) Quit ]

Figure 5-6 Operate Line Card Diagnostics Screen

Note:

The selection “S” only appears when the current status is “Send Remote Loop Code w/Test.”


5-8

Displaying BERT Results Bit Error Rate Test (BERT) results are available only when a remote loopback is actively operating in test mode. The BERT results may be displayed by selecting S from the options included in the OL command menu, only after the Remote Loop Code w/ Test Sent loop has been sent. Figure 5-7 depicts the status screen format that appears after selecting the Display BERT Status Information option.

14:05:10 ---- [ Operate Slot 17 : SDCU-DP ] ---- 08/14/96 Current Status Remote Loopback w/Test (Port A) Loopback Test Period : 0 : 0 : 10 Pattern Sync : Yes Bit Errors : 0 Number of Sync Losses : 0 R) Clear Counters and Resync I) Insert Single Bit Error Q) Quit ]

Figure 5-7 BERT Display


5-9

Alarm Conditions Carrier Group Alarm (CGA) options are set in the SL command screen. A CGA event causes a DSDCU microprocessor interrupt, and an DSDCU transmission interrupt. If a transmission interrupt occurs, and the DSDCU is configured to process CGA events, the DSDCU Data Carrier Detect (DCD), Clear To Send (CTS), and Data Send Ready (DSR) control leads are turned off. Further passage of data from the DSDCU is suspended until the CGA event is cleared.

Index-1

INDEX

A alarms, 5-9 applications, 2-1

C Cable lengths, 3-20, 3-22, A-1 CAD/CAM, 2-2 Carrier Group Alarm (CGA), 4-6 Clear To Send (CTS) Delay, 4-8

D Data Concentrator, 2-3 DCE-to-DTE Cabling, 3-8—3-19 default values, 4-2 diagnostics, 5-1

E Electrostatic damage, 3-1 Equipment Data Loop, 5-2 Equipment Interface Loop, 5-1, 5-6 external 1 timing, 1-3, 3-9, 3-12, 3-15, 3-18, 3-22 external 2 timing, 1-3, 3-10, 3-13, 3-16, 3-19

I Internal Timing, 1-3, 3-5, 3-6, 3-8, 3-11, 3-14, 3-17, 3-21

L LAN-WAN-LAN, 2-1 local and remote loopback capability, 1-2

Index-2

M mapping, 4-9 microcontroller, 1-2, 1-4

N Network Data Loop, 5-1, 5-5, 5-7 NVRAM, 4-1

P polling, 4-7 power requirements, A-2

R Ready To Send (RTS), 4-7

RLSD feature, 4-8

S Send Remote Loop Code, 5-3 Send Remote Loop Code w/Test Sent, 5-4 static-shielded bag, 3-1 synchronous circuits, 1-3

T terminal block screw, 3-1 timing, 1-2 transmit clock, 3-22 troubleshooting, 5-1

V Videoconferencing, 2-4

Hardware Warranty and 90-Day Support Agreement Coastcom warrants that hardware products of its own manufacture shall, at date of shipment and for 24* months from said date, be free from defect in materials. These products will perform substantially as described in applicable Coastcom written materials and support services shall be substantially as described in applicable Coastcom written materials. *Please note the following exceptions: • Any product that reaches end of life (is no longer being manufactured) shall be subject to a 90-day warranty period. • Any product, part or assembly not manufactured by Coastcom is subject to such warranty of the original manufacturer as

negotiated by Coastcom. If any Coastcom product shall be determined by Coastcom to be defective in material or workmanship under normal intended usage and maintenance during the warranty period, then Coastcom shall repair or replace, with substantially equivalent product, at Coastcom's sole discretion, such defective product. Such replacement shall not include the cost of labor by Buyer's own employees, agents or contractors in identifying, removing or replacing the defective product. Coastcom’s liability for breach of any and all warranties hereunder is expressly limited to the repair or replacement of defective products as set forth in this section. In no event shall Coastcom be liable for special, incidental or consequential damages by reason of any breach of warranty or defect in material or workmanship. Coastcom shall not be responsible for the repair or replacement of products which have been subjected to neglect, accident or improper use or installation, acts of God, or which have been altered by other than authorized Coastcom personnel. This warranty is not transferable. Coastcom’s Technical Support Department will provide phone assistance for a period of 90 days from the day of product shipment from Coastcom. Coastcom will provide product upgrades free of charge only as such upgrades fall within that 90-day period. After 90 days, Coastcom will provide telephone consultation and other customer services per a written service agreement providing such agreement has been executed and authorized by the customer. Return Policy: An item may only be returned with prior written approval of an authorized Coastcom representative. Any such approval shall reference a return material authorization number issued by said Coastcom representative. Shipping costs, if any, incurred in connection with the return of a defective item to Coastcom will be paid by Customer. Any shipping costs incurred in connection with the return of a repaired or replaced item shall be the responsibility of Coastcom. However, such costs shall be the responsibility of the Customer if Coastcom determines that the item is NOT defective. If Coastcom determines, at its sole discretion, that the allegedly defective item is not covered by the terms of the warranty provided hereunder or that the warranty claim is made after the warranty period, the cost of repair at Coastcom’s option, including all shipping expenses, shall be reimbursed by the customer. If the returned material is improperly packaged for shipment thereby resulting in further damage the Customer is responsible for the additional repair cost. Coastcom will have no liability with respect to any data contained in any system returned to Coastcom. Coastcom will make every reasonable effort to repair or replace and ship replacement products in warranty within thirty (30) calendar days. Coastcom will make every reasonable effort to repair or replace out of warranty products. THIS EXPRESS WARRANTY SHALL EXTEND TO THE BUYER AND ITS END-USER CUSTOMER ONLY, AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. THERE ARE NO OTHER WARRANTIES EXCEPT AS APPEAR ON THE FACE HERE OF. Copyright © 2001 by Coastcom. All Rights Reserved. Printed in the United States of America. No Coastcom document or parts thereof may be reproduced in any form without prior written permission from Coastcom except where otherwise noted. The information in this manual is subject to change without notice. If you require further information or assistance, contact Coastcom: 1151 Harbor Bay Parkway Alameda, California 94502 Telephone: (800) 433-3433 (510) 523-6000 Fax: (510) 523-6150 [email protected] www.coastcom.com

10/02/02 jide

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Documents

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system users manual

reformatted manual

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coastcoms di mux

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common control unit