Sma1k Technical Description 05

© Copyright Siemens AG 1996 All Rights Reserved Title: Technical Description: SMA 1K Series 3 File: tdsma1k.doc Issue: Date: Ordering Nr./SNR Author: Z. Velkovski page 05 01.10.98 A30808-X3608-A414-05-7618 ICN TR V T3 1/27

TransXpress SDH Products

Technical Description

Synchronous Multiplexer SMA1K

This is an unpublished work the Copyright in which vests in Siemens AG. All rights reserved. The information contained herein is confidential and the property of Siemens AG and is supplied without liability for errors or omissions. No part may be reproduced, disclosed or used except as authorised by contract or other written permission. The copyright and foregoing restriction on reproduction and use extend to all media in which the information may be embodied. This publication provides outline information only which may not form part of any order or contract or be regarded as a representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design or conditions of supply of the product .

Eliminado: SMA_04.doc

Eliminado: ¶

TransXpress SDH Products SMA1K TECHNICAL DESCRIPTION

© Copyright Siemens AG 1996 All Rights Reserved Title: Technical Description: SMA 1K Series 3 File: Sma1k Technical

Description.doc

Issue: Date: Ordering Nr./SNR Author: Z. Velkovski page 05 1.10.98 A30808-X3608-A414-05-7618 ICN TR V T3 2/27

PAGE CONTENTS 2 GLOSSARY OF ABBREVIATIONS 4 RELATED DOCUMENTS 5 1. GENERAL DESCRIPTION 6 1.1 Introduction 6 1.2 Function 6 1.3 Main Features 7 2. APPLICATIONS 8 2.1 Configuration 8 2.1.1 Add-Drop Multiplexer 8 2.1.2 Terminal Multiplexer 8 2.2 Network Topologies 9 2.3 Deployment and Usage 10 2.3.1 Core Network Deployment 10 2.3.2 Edge Network Deployment 10 3. PRODUCT OVERVIEW 11 3.1 Implementation 11 3.2 Equipment Modularity 13 3.3 Protection 14 4. SYSTEM DESCRIPTION 15 4.1 SDH Background 15 4.2 Equipment Architecture 16 4.3 Cross-Connections 16 4.4 SMA1K Management 16 4.4.1 Local Management 17 4.4.2 Remote Management 17 4.5 Timing And Synchronisation 19 4.6 Protection Mechanisms 20 4.6.1 Multiplex Section Protection (MSP) 20 4.6.2 Sub-Network Connection Protection (SNC/P) 21 4.6.3 Card Protection 21 4.7 Fault Management 22 4.8 Performance Management 22


Eliminado: ¶



Description.doc


5. EQUIPMENT SPECIFICATIONS 23 5.1 Interfaces 23 5.1.1 Line Interface, STM-1 Optical 23 5.1.2 Tributary Interface, 2 Mbit/S 23 5.1.3 Tributary Interface, 34 Mbit/S 23 5.1.4 Synchronisation Interfaces 23 5.1.5 Local Craft Terminal Interface 23 5.1.6 Element Manager Interface 23 5.1.7 Engineering Order Wire (EOW) Interface 24 5.1.8 External Data Channel Interface 24 5.1.9 External User Alarm (TIF) Interface 24 5.1.10 In-Station Alarm (BW7R) Interface 24 5.2 Protection 25 5.2.1 Multiplex Section Protection 25 5.2.2 Sub-Network Connection Protection 25 5.3 Operation And Maintenance 25 5.3.1 Alarm Management 25 5.3.2 Performance Management 25 5.4 Environment 25 5.5 Power Supply 25 5.6 Dimensions 25 6. ANNEX 26 6.1 Equipment Modularity 26 6.2 SMA1K Rack Configuration 27


Eliminado: ¶



Description.doc


GLOSSARY OF ABBREVIATIONS

ADM Add/Drop Multiplexer AIS Alarm Indication Signal ALS Automatic Laser Safety shutdown APDP Alarm and Power Distribution Panel ASIC Application Specific Integrated Circuit ATM Asynchronous Transfer Mode AU Administrative Unit BW7R Bauweise 7R , ( Special construction standard ) DCC Data Communication Channel ECC Embedded Control Channel EM-OS Element Manager Operation System EOW Engineering Order Wire EWSD Elektronische Wähl System Digital F F interface to local craft terminal LCT LAN Local Area Network LCT Local Craft Terminal LOS Loss Of Signal MCF Message Communication Function MS Multiplex Section MSP Multiplex Section Protection MTS Multiplexer Timing Source NRZ Non Return to Zero PBX Private Branch Exchange PDH Plesiochronous Digital Hierarchy POH Path Overhead POP Point of Presence Q Q interface to telecommunication management network (TMN) SC System Controller SDH Synchronous Digital Hierarchy SD Signal Degraded SEMF Synchronous Equipment and Management Function SF Signal Fail SMA Synchronous Multiplexer SMN/OS Synchronous Management Network Operation System SNC/P Subnetwork connection protection with path monitoring SOH Section overhead STM-1 Synchronous Transport Module level 1 TIF Telemetry Interface TM Terminal Multiplexer TU Tributary unit VC Virtual container VCXO Voltage Controlled Crystal Oscillator WAN Wide Area Network


Eliminado: ¶



Description.doc


2. RELATED DOCUMENTS The design of the SMA1K is based on the following standards and recommendations: ITU-T G.703 G.707 G.708 G.709 G.783 G.813 G.823 G.841 G.957 G.958 V.11 EN 60 950 ETS 300 019 300 119 300 132 300 147 300 166 300 417 - 1..5 300 462-5 300 386-1 FTZ 1 TR 9 19 Pfl 1 TL 6130-3011, Part 3


Eliminado: ¶



Description.doc


1. GENERAL DESCRIPTION 1.1 INTRODUCTION

This document is intended to provide the reader with comprehensive information on the SMA1K Series 3 Synchronous Multiplexer. The Synchronous Multiplexer SMA1K is a member of the Series 3 Family of SDH products developed by SIEMENS. The Series 3 Product Family is a set of highly flexible equipment for the transport for PDH and SDH signals that supports SDH aggregate signals from STM-1 up to STM-16 hierarchical levels. The members of the Series 3 Product Family are Digital Crossconnects, Synchronous Line Equipment, Synchronous Radio and Synchronous Multiplexers. For more information about the other Siemens SDH Products from the Series 3 Family please refer to the appropriate Product Descriptions.

1.2 FUNCTION

The SMA1K is an ultra compact Synchronous Multiplexer that operates at a line rate of 155 Mbit/s (STM-1). In its Standard Configuration it offers tributary access for 21x2Mbit/s. The tributary access can be expanded via optional daughter boards to 63x2Mbit/s or to 21x2Mbit/s plus 1x34Mbit/s. In addition, it also offers various interfaces for:

• Operator monitoring/control by local or remote management systems (LCT/NCT and/or TransCommander)

• In-Station Alarm Scheme (BW7R) • EOW facility • External Data Channels • External Synchronisation • External Alarm Inputs

In its simplest application (as unprotected Terminal Multiplexer) all of the above functions are realised on a Single Card. Only two Cards are required for protected Terminal or full Add-Drop Multiplexer Applications. This is made possible by high level of integration and utilisation of the latest state-of-the-art development in the semi-conductor technology (ASICs with approximately 1 million gates).


Eliminado: ¶



Description.doc


1.3 MAIN FEATURES

The major features of the SMA1K are: • Ultra compact design that allows it to be used as a terminal or an add-drop

multiplexer. This offers the network operator planning flexibility and considerable savings in exchange floor space, spares holding, training requirements and maintenance costs.

• SDH - Multiplex structure according to ETSI specification ETS 300147 (derived from ITU -T Rec. G.707).

• STM-1 L-1.1 & L-1.2 Optical Interfaces with E2000, DIN or FC/PC type of optical connectors.

• Tributary access of up to 63x2Mbit/s or 21x2Mbit/s plus 1x34Mbit/s multiplexed directly into STM-1 Optical Bearer.

• SMart (STEP Mechanical State-of-the-Art) Quarter Pack housing mountable on a 19” or ETSI type racks (4 units per row, total of 16 per rack).

• Extensive Traffic and Equipment Protection Mechanisms. • Comprehensive synchronisation capability including support of SSMB operation

and the ability to synchronise to incoming STM-1 line, external synchronisation sources or from a 2 Mbit/s tributary.

• Support of line-line and line-trib type cross-connections. • Support of broadcast type cross-connections. • Automatic Laser safety shutdown (ALS). • Distributed power supply. Each Card is equipped with an on-board power converter

which is fed via duplicated DC power feeds. • Full integration into the TransXpress TMN for Network Layer and Element Layer

Management. • Remote operator control via the Siemens SDH Network Management System

TransIntegrator (SMN-OS), Element Manager TransCommander (EMOS) and/or Network Craft Terminal (NCT).

• Local operator control via Local Craft Terminal. • EOW Facility (optional). • Support of 64 kbit/s external data channels (compliant to V.11). • Support of In-Station Alarm Monitoring Scheme (BW7R).


Eliminado: ¶



Description.doc


2. APPLICATIONS

2.1 CONFIGURATION The SMA1K can be configured as an Add-Drop Multiplexer (ADM) or as a Terminal Multiplexer (TM).

The unprotected Terminal Multiplexer Application is implemented on a single card.

The Add-Drop Application and the protected Terminal Multiplexer Application require only two cards.

2.1.1 Add-Drop Multiplexer This configuration allows access to aggregate bearer traffic in ring or chain networks.

Tributaries21X2 Mbit/s or

63X2 Mbit/s or

21X2 Mbit/s plus1X34 Mbit/s

STM-1 AggregateSMA1KSTM-1 Aggregate

Figure 1: Add/Drop Configuration

2.1.2 Terminal Multiplexers

This configuration is used when the SMA1K is deployed as a spur from a SDH ring, at the end of a chain or in point to point applications.

Tributaries21X2 Mbit/s or

63X2 Mbit/s or

21X2 Mbit/splus1X34 Mbit/s

STM-1

SMA1K

STM-11+1

(optional)

Figure 2: Terminal Configuration Eliminado: SMA_04.doc

Eliminado: ¶



Description.doc


2.2 NETWORK TOPOLOGIES

SMA1K can be connected in a ring topology to interconnect customer premises equipment to a local digital exchange or to interconnect local digital exchanges. It can also be connected in a chain topology providing tributary access to main SDH Rings. A typical examples of both, the ring access and linear chain access are shown on Figure 3 below.

SMA-4

SMA-4

STM-4 Ring

SMA1K

SMA1K

SMA1 SMA-4STM-1 Ring

LocalExchange

SMA1K

SMA1K

STM-1

STM-1

SMA1K

SMA1K

STM-1

STM-1

(Terminal)

(Add-drop)

(Add-drop)(Terminal)

Figure 3: Example Network Topology

In the above figure the STM-1/4 rings can be build using mixes of SMA1K, Series 1 or Series 2 SDH Multiplexers from the Siemens SDH Product Family. The SMA1K is fully compatible with the current generation of Siemens Series 1 and 2 SDH Multiplexers. It can be used for expanding existing field installations or adding new applications to the existing core networks. The SMA1K is well suited for ring and chain type applications and can be utilised in all types of network topologies.


Eliminado: ¶



Description.doc


2.3 DEPLOYMENT AND USAGE

The SMA1K is designed to complement the existing Siemens Families of SDH Multiplexer Products and to offer the existing and new customers the benefits of latest technology developments translated into simpler and more compact (smaller) thus more cost-effective product. Some of the envisaged deployment types for the SMA1K are indicated in the text below.

2.3.1 Core Network Deployment

Due to its application versatility the SMA1K is well suited to applications in the lower speed core transport networks. Typical SDH Multiplexer Applications like Add-Drop Multiplexer (ADM) or Terminal Multiplexer (TM) are both supported thus providing the operator with the flexibility to build ring or chain types of transport structures. Considering the compatibility with existing Series 1 and 2 Families of Siemens SDH Multiplexers it is perfectly suited for expansion of the existing installed base or network growth under the common network management platform. By deploying it in the Core Network the Network Operators can take full advantage of the increased simplicity and significant savings in the floor space offered by the SMA1K.

2.3.2 Edge Network Deployment

With its extremely compact design the SMA1K is particularly well suited to customer premises deployment. It can be easily located at the customer premises providing WAN access for a variety of other type of traditional customer premises equipment like PBX, Routers, LAN switches, Primary Rate Multiplexers or TV Codecs for transmission of TV Signals over digital transport networks. In addition, the SMA1K can be used by network operators as POP (point-of-presence) to link separate parts of corporate networks or provide access for corporate networks to public networks. The SMA1K can also be used as transport multiplexer in remote modules of the EWSD switching system or as a transport platform for the forthcoming ATM Access Switches located at customer premises.


Eliminado: ¶



Description.doc


3. PRODUCT OVERVIEW

3.1 IMPLEMENTATION

The SMA1K is implemented as a single card Synchronous Terminal Multiplexer that can be duplicated for the Add-Drop Applications. The SMA1K provides line and tributary interfaces as well as interfaces for local and remote management, synchronisation, external data channels, EOW, In-Station Alarm scheme etc. The Block Diagram of the SMA1K system concept is shown in figure 4, below.

ITRACHIP ASIC

Backplane

BW7RV.11

SystemController

EOW

2M Interfacesand

daughterboardPower

Supply

VCXO MTS

OpticalInterfaceSTM-1

Alarm i/fV.11 i/f

T3, T4

F i/f

Q i/f

EOW i/f

2Mbit/s i/f

34 Mbit/s i/f

Figure 4: SMA1K System Concept Block Diagram

At the heart of the SMA1K is the state-of-the-art ITRACHIP ASIC which provides all of the switching and synchronisation functions. It allows cross-connections to be made between the line and the tributary side and in addition, in the add-drop applications, between the two available line sides.

The main card provides on-board tributary access for 21x2 Mbit/s data signals. In addition, provisions have been made for optional plug-in daughter boards that can increase the tributary access for additional 42x2Mbit/s or 1x34Mbit/s tributary ports.

Separate on-board circuitry is used to provide the Optical Line Interface, BW7R Interface and access to external V.11 compliant 64 kbit/s Data Channel. The EOW function is realised by an optional plug-in daughter board.

Block diagram of a SMA1K in a protected Terminal Multiplexer or Add-Drop Application is shown in figure 5 below.


Eliminado: ¶



Description.doc


Backplane

SystemController

EOWITRACHIP ASIC

2M Interfacesand

daughterboardPower

Supply

STM-1Optical

Interface

VCXO MTS

Alarm i/fV.11 i/f

T3, T4

F i/f

Q i/f

EOW i/f

2Mbit/s i/f

34 Mbit/s i/f

ITRACHIP ASIC

2M Interfacesand

daughterboard

PowerSupply

VCXO MTS

STM-1Optical

Interface

BW7RV.11

Protection Card

Worker Card

Figure 5: SMA1K Block Diagram for Protected Terminal or Add-Drop Applications

The basic hardware difference between the Worker Card and the Protection Card is that the System Controller, BW7R ,V11 and EOW function circuitry are realised on the Worker Card only.

The MTS function is implemented as part of each ITRACHIP ASIC. In addition, a very stable VCXO meeting the requirements of ITU-T Recommendation G.813 (+4,6 ppm) is used on each card to provide clock signals for cases where no other synchronisation sources are Eliminado: SMA_04.doc

Eliminado: ¶



Description.doc


available (Freerunning mode of operation). In protected configuration all of the functions of the ITRACHIP ASICs are synchronized. The on-board System Controller provides interfaces for local and/or remote management and carries out all of the SEMF and MCF functions. It supports both, F-Interface for local management (LCT) and Q-Interface for remote management (TransCommander). In protected applications the System Controller located on the Worker Card manages both, Worker and Protection Cards. Note: Due to the power requirements of the AUI interface (Q-Interface) and limited space available on the Main Card, the circuitry feeding the AUI interface is located on the EOW daughter board. This means that whenever a NE is to be used as a GNE, an EOW daughter board has to be inserted. The design of the orderable items (Building Blocks) makes allowance for this specific requirement.

The Power Supply of the cards is realised using on-board power supply circuitry that is connected to the station power supply system via duplicated power feeds.

3.2 EQUIPMENT MODULARITY

The SMA1K consist of a core unit to which additional units can be added depending on the customer application. Table 1, below, depicts the units available with the SMA1K.

TABLE 1: SMA1K EQUIPMENT OPTIONS SMA1K Core Units Application Dependent Units Sub-rack SMA1K Protection Card ETSI/19" Rack Mounting kit 42x2 Mbit/s Additional Tributary Access daughter board SMA1K Worker Card 1X 34Mbit/s Additional Tributary Access daughter board Set of connectors for power, timing, ancillary, tributaries etc.

EOW daughter board and handset

The SMA1K Core can be upgraded with Application Dependent Unit(s) at any time during operation. In most of the situations the In-Service Upgrade can be carried out without affecting the existing traffic connections. A list of available equipment building blocks is provided in clause 6.1 of this document. Figure 6, below, shows the functional blocks of the SMA1K subrack .

Q I / F

F I / F

E O WI / F

B W 7 RI / F

T I FI / F

V . 1 1I / F

T 3 / T 4I / F

T r i b u t a r yI / F

O p t i c a l C a b l e G u i d e

SMA1K

Worker

Card

SMA1K

Protection

Card


Eliminado: ¶



Description.doc


Figure 6: SMA1K Subrack Functional Blocks

The interface area provides the required termination for tributary, timing, management and ancillary signals. The Worker and the Protection Card (if required) are located in the main card area as shown on Figure 7, below.

SMA1K

W(West)

SMA1K

P(East)

(Optional)

Figure 7: SMA1K System in SMart QuarterPack housing

A standard ETSI or 19" style rack allow up to four SMart QuarterPack-subracks to be placed in a row (next to each other) thus making possible installation of up to 16 complete SMA1K systems in one standard ETSI/19" rack. This is a significant saving in installation space that Network Operators can take advantage off in installations where real estate is at a premium.

3.3 PROTECTION

SMA1K provides a number of protection options. In addition to the card protection, as detailed above, SNC/P and MSP protection mechanisms are also supported. Further details on protection are given in Section 4, below.


Eliminado: ¶



Description.doc


4. SYSTEM DESCRIPTION

4.1 SDH BACKGROUND

The SMA1K supports the multiplexing structure of G.709 and can be used in SDH networks based on ITU-T Recommendations G.707 to G.709.

The Multiplexing Structure defines the way in which signals are structured within the STM-1 frame, terminated by the SMA1K, as shown on Figure 8, below.

C-3

C-12

AU-4 VC-4

TUG-3 TU-3 VC-3

TUG-2

VC-12TU-12

X1X3

X7

X3

34Mbit/s

2Mbit/s

Pointer Processing

Multiplexing

Mapping

STM-1X1

Aligning

Figure 8: SMA1K Multiplexing Structure for STM-1 Aggregate Signals

For example, a 2 Mbit/s tributary signal is mapped into a C-12 container and Path Overhead (POH) information is added to form a Virtual Container, VC-12. The POH allows the operator to monitor the end-to-end path quality through the network. The SMA1K also supports virtual containers for bit rates of 34 Mbit/s (VC-3). A pointer is added to each virtual container to adapt signals between different timing clocks used within the network. The VC and associated pointer combination are called Tributary Units (TU). Multiple Tributary Units are multiplexed to form Tributary Unit Groups (TUGs) as shown in Figure 8 above . Seven TUG-2s or a single TU-3 are combined to form a TUG-3, which is then multiplexed into a higher order Virtual Container, a VC-4. The VC-4 has an alignment pointer added to it to produce an Administrative Unit (AU-4). Section Overhead (SOH) bytes are then added to complete the STM-1 signal.


Eliminado: ¶



Description.doc


4.2 EQUIPMENT ARCHITECTURE

In the transmit directions the signals from the tributary side are routed via the interface circuitry where they are terminated and presented to the ITRACHIP ASIC. There they are assembled into an aggregate STM-1 line signal. The ITRACHIP ASIC inserts the Section Overhead and retimes the data at the system clock. The signal is passed to the Optical Interface circuitry where the electrical format is converted to light and transmitted over the optical fibre bearer.

In the receive direction the reverse process takes place.

Section Overhead bytes accommodate the control and management transport function associated with the transmission of the SDH payload. These include frame alignment bytes, error monitoring data, data communications channels and auxiliary channels.

In addition to the ability to add/drop traffic from the STM-1 bearer the SMA1K has the capability for through traffic connectivity. The number of tributary access ports available is dependent on the mix of interfaces equipped. The SMA1K supports the following combinations of tributary traffic access ports:

Number of Ports Physical Location 21x2Mbit/s on-board 63x2Mbit/s 21 on-board + 42 on a daughter board 21x2Mbit/s + 1x34Mbit/s 21x2Mbit/s on-board + 1x34Mbit/s on a daughter board

4.3 CROSS-CONNECTIONS

The SMA1K supports cross-connections at VC-12 and VC-3 level only. The following type of cross-connections are supported:

• Line to Line • Line to Trib

4.4 SMA1K MANAGEMENT

The SMA1K can be managed by the operator either from a local or remote management system, Local Craft Terminal and TransCommander (EM-OS), respectively. In addition, Network Craft Terminal type management is also supported.

The following management functions are supported:

• Configuration • Fault • Performance • Maintenance • Security

This is made possible by the on-board System Controller which is located on the Worker Card. The System Controller supports and carries out all of the relevant SEMF and MCF functions.


Eliminado: ¶



Description.doc


If two cards are used in protected Terminal MUX applications or when he SMA1K is used as an Add/Drop Multiplexer then both cards, (the Worker and the Protection) are managed by the System Controller located on the Worker Card.

4.4.1 Local Management

An RS232 (F) interface is provided for direct connection of the Local Craft Terminal which is IBM compatible Personal Computer. The Local Craft Terminal is a Windows NT based application for keyboard and mouse operation. The operator access is password protected to ensure that the SMA1K database is not accessed/altered by unauthorised users. The minimum recommended hardware platform is as follows:

• IBM compatible Personal Computer • 486 or better processor running at 133 MHz+ • 16+ Mbytes of RAM • 3.5 inch high density floppy disk drive • Serial port for connection to the SMA1K • Parallel port for a printer (optional) • VGA (or better) colour monitor • Microsoft Windows NT application

If supplied by Siemens, the LCT is most likely to exceed the above requirements.

4.4.2 Remote Management A Qx interface (Ethernet) is provided for remote management of the SMA1K. The remote management can be either by a Network Craft Terminal or a TransCommander (EM-OS) and is realised by using the DCCm communication channels between the "Gateway" SMA1K (the NE connected to the NCT/TransCommander via Ethernet link) and the other NEs that belong to the same sub-network, as shown on Figure 9, below. IS-IS routing mechanism is used to provide DCC channel protection from network interruptions. The Local Craft Terminal hardware platform (Personal Computer) with addition of an Ethernet compatible modem is used as a Network Craft Terminal by using the appropriate Network Software Application. The TransCommander is a powerful software system running on a HP UNIX workstation. More information on the TransCommander can be found in its own product description document. Eliminado: SMA_04.doc

Eliminado: ¶



Description.doc


GNESMA1K SMA1K SMA1K SMA1K

Q

Network Craft Terminal (IBM Compatible PC)orTransCommander (HP Workstation)

sub-network

SMA1K

Figure 9: Remote Management of SMA1K

The general principle of SMA1K Remote Management on a Network Level when mixed with other types of network elements from the family of Siemens SDH Transport Products is shown in Figure 10, below.

SMA 1/4Series 1 and/or 2

SMA1K

SLR, SLT,SLD

Transmission Network

DCC

TransCommander(EMOS)

NCT

Q Q

Gateway Network Elements

Figure 10: Remote Management of Siemens SDH Transport Products


Eliminado: ¶



Description.doc


4.5 TIMING AND SYNCHRONISATION

The SMA1K is able to synchronise its internal system clock and all output interfaces from a variety of timing sources. All synchronisation functions are realised by the MTS functional block that is part of the ITRACHIP ASIC. Three modes of operation are supported, Freerun, Normal and Holdover. In Freerun mode the internal clock and the STM-1 outputs are synchronised to a high quality VCXO oscillator that meets the requirements of the ITU-T Recommendation G.813 (frequency stability better than + 4,6 ppm). In Normal Mode any or all of the following may be selected and prioritised as the synchronisation source:

• Incoming STM-1 Signal Timing Reference T1, maximum 2 sources can be selected.

• Selected 2 Mbit/s Tributary Port Timing Reference T2, maximum 2 out of the available 63x2 Mbit/s tributary signals can be selected.

• External 2048 KHz signal Timing Reference T3/T4, one input and one output interface is available.

Should all the timing sources used under Normal Mode fail the SMA1K will go into Holdover Mode. In this mode the synchronisation is provided using the last known acceptable timing source. When a selected timing source fails the next available priority is automatically selected without any effect on the existing traffic connections. When the original source is restored the consequent action depends on whether the operator has configured Revertive or Non-revertive operation. In Revertive mode each timing sink will always choose the higher priority timing source when it becomes available, after an operator configurable Wait-To-Restore time period. In Non-revertive mode the higher priority source will not be selected after re-establishment until the currently selected source fails. The equipment also supports the ITU-T defined Synchronisation Source Marker Byte (SSMB) function which allows the quality of the selected source to be transmitted within an STM-N signal. STM-N timing sources may be rejected on receipt of an SSMB timing marker reporting poor timing quality.


Eliminado: ¶



Description.doc


4.6 PROTECTION MECHANISMS

SMA1K features extensive protection schemes for both traffic and equipment protection:

Traffic Protection • Multiplex Section Protection (MSP) • Sub Network Connection Protection (SNC/P) • Drop and Continue/Dual Homing

Equipment Protection • Tributary Protection, 2M, 34M • MTS Function Protection (Synchronisation) • Switching Network Protection • Optical Interfaces Protection (combined with MSP) • Power Supply Protection

All of the above protection functions are implemented by the 1*1 card protection of the main card.

All of the protection mechanisms can be configured as autonomous, manual, revertive or non-revertive.

In the Autonomous Mode the SMA1K takes action to rectify a traffic affecting defect by invoking a protection mechanism without operator intervention.

In the Manual Mode the protection mechanism is invoked by the operator via the management interface (local or remote).

In Revertive Mode the original condition is reselected when its quality has been restored to normal working. In Non-Revertive Mode the new condition will continue to be used even if the original condition has been restored to normal working.

4.6.1 Multiplex Section Protection (MSP)

The MSP type implemented in the SMA1K is a single ended linear MSP that combines Card Protection. Due to the ultra compact design (maximum of two cards per system) the MSP protection method can only be used in the Terminal Multiplexer Applications. When MSP is used, both cards, Worker and Protection, receive both incoming STM-1 signals. Each card is responsible for its respective outgoing STM-1 line signal. In the normal operation the Worker Card monitors both incoming multiplex sections and feeds the working STM-1 traffic to the tributary interfaces. When disturbance is detected in any of the incoming STM-1 signals then the alternative incoming STM-1 signal is selected. In case of a Worker Card failure the Protection Card is enabled to feed the incoming STM-1 traffic to the tributary side. In addition to the traffic the MSOH bytes DCCm, E2, NU98, NU99, RES62 and RES63 are also protected with the linear MSP. The MSP can be configured to be automatic, manual, revertive or non-revertive. Eliminado: SMA_04.doc

Eliminado: ¶



Description.doc


4.6.2 Sub-Network Connection Protection (SNC/P)

This protection mechanism is applicable to ring configurations and is available for VC-12 and VC-3 levels. At the transmit end the TU traffic from a single tributary port is presented to both, East and West Line Cards to provide transmission in both directions around the ring. At the receiving end a selection is made for one of the two available signals coming from the two separate lines.

Any line or tributary port can be selected as a source or destination. The SNC/P can be configured to be automatic or manual.

4.6.3 Card Protection

In general, this method can only be used in conjunction with the other protection mechanisms described above (SNC/P or MSP). If a total Worker Card failure occurs then the Protection Card is capable of maintaining error free all of the existing traffic connection. The Power Supply and MTS circuitry functions are protected as part of the Card Protection mechanism. If any of them fail on the Worker Card , then all of the functions are taken over to be handled by the Protection Card. After Card Protection has taken place the management access via F/Q interface is possible if the System Controller (SC) circuitry located on the Worker Card is still active i.e. if the Worker Card failure did not affect the System Controller circuitry. In the cases where total Worker Card failure occurs including the SC then all of the traffic functions would be taken over by the Protection Card. At this point, although the existing traffic would not be affected (after a short switchover period), the management of the SMA1K would be interrupted. The removal of the faulty Worker Card (where the SC is located) will not affect the existing traffic as it is handled by the Protection Card. When the replacement Worker Card is inserted the new SC would first upload all of the configuration data from a non-volatile memory bank located on the subrack backplane. After successful completion of the configuration upload the SC becomes functional, the Worker Card would be ready to handle the traffic again and the management function would be re-established.


Eliminado: ¶



Description.doc


4.7 FAULT MANAGEMENT

A comprehensive Fault Management function supervising the correct function of all of hardware and software modules within the network element as well as monitoring the integrity of all incoming data signals is deployed in the SMA1K.

The following tasks are carried out by the Fault Management function:

• To detect anomalies and to report some of them to the performance management function.

• To derive defects by eliminating spurious anomalies and to report some of them to the performance management function.

• To trigger automatic maintenance actions such as ALS, protection switching, AIS insertion, far end defect indications etc...

• To process operator controlled maintenance actions. • To perform alarm reduction through correlation of defects. • To assign severity levels to alarm events (static table is used for the BW7R alarms). • To time stamp alarm events using the system real time clock. • To issue spontaneous alarm event notifications to the local/remote management

systems. • To report alarms to the local alarm system. • To indicate fault state of replaceable units. • To store alarm events in historical event log and the alarm status in a current problem

list. • To support fault location for diagnostic purposes and to assist in maintenance.

4.8 PERFORMANCE MANAGEMENT

In addition to the Fault Management function described above a Performance Management function is also implemented in the SMA1K. The following functions are carried out as part of the Performance Management function:

• Performance monitoring (PM) • Inquiry of current PM values • Inquiry of the previous PM values • Threshold crossing notification (TCN) • TCN event reporting • Inquiry of the currently raised TCN states

The following performance entities are monitored: • Erred seconds (ES) • Severely erred seconds (SES) • Unavailable time (UAT) • Background block errors (BBE)

The values of the above performance entities are counted for 15 min/24 hour time periods and stored in performance logs. Up to sixteen 15 min. performance reports and up to two 24 hour performance reports can be stored and retrieved.


Eliminado: ¶



Description.doc


5. EQUIPMENT SPECIFICATIONS 5.1 Interfaces: 5.1.1 Line Interfaces, STM-1 Optical

Bit rate 155 Mbit/s Multiplexing Structure as per ETS 300 147 User class as per ETS 300 232 (ITU-T G.957) L-1.1, L-1.2 Nominal Transmit Optical Power Level (point S) -5 to 0 dBm Receiver sensitivity (10-10 at point S) -34 to 0 dBm Auto Laser Shutdown (ALS) as per ITU-T G.958

5.1.2 Tributary Interfaces, 2 Mbit/s

Bit rate 2048 kbit/s Code HDB3 Electrical parameters as per ETS 300 166 Jitter performance as per ITU-T G.823 Number of Input/Output channels up to 63

5.1.3 Tributary Interfaces, 34 Mbit/s

Bit rate 34 368 kbit/s Code HDB3 Electrical parameters as per ETS 300 166 Jitter performance as per ITU-T G.823 Number of Input/Output channels 1

5.1.4 Synchronisation Interfaces Physical and Electrical parameters as per ETS 300 166 Number of External Synchronisation Inputs 1 Number of External Synchronisation Outputs 1 Jitter as per ETS 300 462-5

5.1.5 Local Craft Terminal Interface

Performance parameters RS232 interface to IBM compatible PC. Number of Interfaces 1

5.1.6 Element Manager Interface

Performance parameters Qx (Ethernet) Number of Interfaces 1


Eliminado: ¶



Description.doc


5.1.7 Engineering Order Wire Interface

Number of Interfaces 1 Electrical parameters

realisation 4 wire transmission range 300 to 3400 Hz input level -1,5 dBr output level -15,5 dBr input impedance 600 Ohm, balanced output impedance 150 Ohm, balanced modulation PCM, A-law dialling DTMF distance to SMA1K < 5m

5.1.8 External Data Channel Interface

Number of Interfaces 1 Electrical Parameters ITU-T V.11* Realisation Details

direction bi-directional bit rate 64 kbit/s data format NRZ data input/clock contra-directional data output/clock co-directional max. load resistance 150 Ohm, balanced input impedance 159 Ohm + 10% effective range app. 1000 m

Note*: The 64 kbit/s interface is V.11 compliant with the following exceptions:

- The receiver has an internal impedance of 150 Ohm + 10% - The transmitter is able to drive an external load impedance of 150 Ohm

5.1.9 External User Alarm (TIF) Interface

Number of external alarms supported 2 Input voltage range 0 to -75 V Input current range 1 to 5 mA Voltage range for active state 0 to -3 V Voltage range for inactive state -10 to -75 V Relation between the input state and alarm state configurable via the management

interface 5.1.10 BW7R Interface

Number of Interfaces 1 Signalling voltage (+S/-S) 10.5V to 75 V, isolated and

ungrounded Load rating <60 V, < 100 mA


Eliminado: ¶



Description.doc


5.2 Protection 5.2.1 Multiplex Section Protection

Switchover time < 50 ms Operation Mode Automatic, Manual, Revertive,

Non-Revertive Wait to restore time (for revertive operation) 5 to 12 min in steps of 1 min.

5.2.2 Sub-Network Connection Protection

Switchover time < 50 ms Operation Mode Automatic, Manual, Non-

Revertive Configurable persistency check 100 msec. to 10 sec. in steps of:

100 msec for range 0.1 to 1sec 1 sec for range 1 to 10 sec.

5.3 Operation and Maintenance 5.3.1 Alarm Management

Storage capacity of historical event log 100 records Logging granularity 1 sec. Alarm event handling time < 5 sec.

5.3.2 Performance Management

Monitoring Intervals 15 min. and 24 Hour Number of 15 min. reports stored 16 Number of 24 hour reports stored 2

5.4 Environment

Climatic Conditions as per ETS 300 019-1, Class 3.1E Normal Operating Temperature Range -5 to +45° C

5.5 Power Supply

Number of Interfaces 2, reverse polarity protected Input Voltage Range -40,5 to -75 V at rack level -38,5 to -75 V at card level Power Consumption < 40 W (typical 30 W) Performance Parameters as per ETS 300 132-2, ETS 300 386-1, EN 60950, FTZ 1

TR 9, FTZ 19 PFL 1, TL 6130-3011, Part 3

5.6 Dimensions 130 X 425 X 280 mm


Eliminado: ¶



Description.doc


6. ANNEX 6.1 Equipment Modularity

Table 2 below lists the Building Blocks available with the SMA1K : Building Block No. Title

J20-0.1 Installation Set for 19” Racks J20-0.2 Installation Set for wall mounting (sidewise) J20-0.3 Installation Set for wall mounting (back mounting) J20-0.4 External Synchronisation Access cable J20-0.5 V.11 and External User Alarm Access cable J20-1.1 Standard Equipment Core J20-1.2 Premium Equipment Core; Unprotected Terminal J20-1.3 Premium Equipment Core; Protected Terminal J20-1.4 Standard System Software Licence fee, Unprotected Terminal J20-1.5 Premium System Software Licence fee, Unprotected Terminal J20-1.6 Standard System Software Licence fee; Protected Terminal J20-1.7 Premium System Software Licence fee; Protected Terminal J20-2.1 STM-1 Optical LH 1310 nm (DIN), Worker J20-2.2 STM-1 Optical LH 1310 nm (FC/PC), Worker J20-2.3 STM-1 Optical LH 1310 nm (E2000), Worker J20-2.4 STM-1 Optical LH 1550 nm (DIN), Worker J20-2.5 STM-1 Optical LH 1550 nm (FC/PC), Worker J20-2.12 STM-1 Optical LH 1550 nm (E2000), Worker J20-2.6 STM-1 Optical LH 1310 nm, 2 ports (DIN) J20-2.7 STM-1 Optical LH 1310 nm, 2 ports (FC/PC) J20-2.8 STM-1 Optical LH 1310 nm, 2 ports (E2000) J20-2.9 STM-1 Optical LH 1550 nm, 2 ports (DIN) J20-2.10 STM-1 Optical LH 1550 nm, 2 ports (FC/PC) J20-2.11 STM-1 Optical LH 1550 nm, 2 ports (E2000) J20-3.1 42 X 2 Mbit/s Access Extension J20-3.2 1 X 34 Mbit/s Access Extension J20-3.3 42 X 2 Mbit/s Access Extension Set J20-3.4 1 X 34 Mbit/s Access Extension Set J20-3.5 Extended System Software Licence fee; Unprotected Terminal J20-3.6 Extended System Software Licence fee; Protected Terminal J20-3.7 EOW/LAN-Kit for Gateway Set J20-3.8 EOW Software Licence Fee J20-4.3 LCT Application Software J20-4.4 NCT Connection Licence J20-4.5 Handbook (German), Paper Format J20-4.6 Handbook (English), Paper Format J20-4.7 Handbook (German), CD-ROM Format J20-4.8 Handbook (English), CD-ROM Format J20-5.1 STM-1 Optical LH 1310 nm (DIN), Protection J20-5.2 STM-1 Optical LH 1310 nm (FC/PC), Protection J20-5.3 STM-1 Optical LH 1310 nm (E2000), Protection J20-5.4 Application Upgrade Software Licence fee J20-5.5 42 X 2 Mbit/s Access Extension for Upgrades J20-5.6 1 X 34 Mbit/s Access Extension for Upgrades J20-5.7 STM-1 Optical LH 1550 nm (DIN), Protection J20-5.8 STM-1 Optical LH 1550 nm (FC/PC), Protection J20-5.9 STM-1 Optical LH 1550 nm (E2000), Protection T20-0.1 ETSI Standard Rack, basic equipped T20-3.1 Local Craft Terminal Hardware T20-3.2 Network Craft Terminal Hardware T20-3.3 LCT Software Kernel T20-3.4 NCT Software Kernel

For more information on the Building Block items please refer to the Building Block Design document A30808-X3608-B522-*-7632 available in the SDH Multiplexer Product Folder. The electronic version of this document is located on Siemens INTRANET as part of the CatEna pages.


Eliminado: ¶



Description.doc


6.2 SMA1K Rack Configuration

APDP Panel

Connection Field

SMA1KNo. 1

SMA1KNo. 2

SMA1KNo. 3

SMA1KNo. 4

SMA1KNo. 1

SMA1KNo. 2

SMA1KNo. 3

SMA1KNo. 4

SMA1KNo. 1

SMA1KNo. 2

SMA1KNo. 3

SMA1KNo. 4

SMA1KNo. 1

SMA1KNo. 2

SMA1KNo. 3

SMA1KNo. 4

End of Document


Eliminado: ¶

Sma1k Technical Description 05

Documents

sma1k management

tributary interface

line interface

protection mechanisms

card protection

system description

general description

alarm management