td_lomif_lomi4

EN/LZTBU 250 201/5 RA

UMUX from KEYMILE, covers all your communication requirements in one system.

UMUX Technical Descriptions Units

LOMIF 158, 152 & LOMI4 159, 151

Technical Description LOMIF 158, 152 & LOMI4 159, 151

Copyright and Confidentiality: Copyright in this document vests in Keymile AG (KEYMILE). This document contains confidential information which is the property of KEYMILE. It must be held in confidence by the recipient and may not be used for any purposes except those specifically authorised by contract or otherwise in writing by KEYMILE. This document may not be copied in whole or in part, or any of its contents disclosed by the recipient to any third party, without the prior written agreement of KEYMILE.

Disclaimer: KEYMILE has taken reasonable care in compiling this document, however KEYMILE accepts no liability whatsoever for any error or omission in the information contained herein and gives no other warranty or undertaking as to its accuracy. KEYMILE reserves the right to amend this document at any time without prior notice.

Document number: EN/LZTBU 250 201/5 RA

Keymile AG Schwarzenburgstrasse 73 CH-3097 Bern-Liebefeld Switzerland © March 2005 by Keymile AG

© KEYMILE AG

EN/LZTBU 250 201/5 RA Technical Descriptions Units iii

Contents iPrecautions and safety 1 Referenced documents 1 Introduction 2

Overview 2 Definition of terms 2

Functions 2 LOMIF 158 2 LOMIF 152 4 LOMI4 159 4 LOMI4 151 4

View of the unit 4 Slot allocation 5

Versions and prerequisites 5 Functional Description 6

Applications 6 Traffic handling capacities 6

PBUS 6 Subrack and units 6 Control units 7

Functions 7 E12/P12 traffic signals 7

Signal layer 9 E12/P12 9

Synchronisation and timing 10 Maintenance functions for traffic signals 10 Performance monitoring 12 Protection 12 Interfaces 13

Traffic signals 13 Cables 13 Optical fault indicators 14

Complements to features 14 System level features 14 Unit level features 14

Summary of Standards 15 Generic and architecture 15 Access digital section for ISDN primary rate 16

Contents © KEYMILE AG

iv Technical Descriptions Units EN/LZTBU 250 201/5 RA

Synchronisation and timing 16 EMC 16 Emission 16 Immunity 16 Safety 16 Ambient conditions 16

Technical Specification 17 Parameters controlled via UCST 17

Unit parameters 17 Unit alarms 17 Performance Monitoring 19 Status/Maintenance function 19

Modes and traffic signals 19 E12/P12 traffic layer 19 PRA 19 NT1 Leased Lines 20 V5.x applications 20 Clock Master mode 20

Performance monitoring 20 Maintenance functions 20 Physical 2 Mbit/s signals 21 Power consumption 21

LOMIF 21 LOMI4 21

Mechanical Parameters 21 Construction 21 Dimensions 21 Weight 22

Reliability 22

Contents © KEYMILE AG

EN/LZTBU 250 201/5 RA Technical Descriptions Units v

Figures

Figure 1: Front View of the LOMI<X> 4

LOMIF 140, 158 & LOMI4 150, 159 © KEYMILE AG

EN/LZTBU 250 201/5 RA Technical Descriptions Units page 1 of 22

Precautions and safety

For generic information on precautions and safety refer to [033].

Referenced documents

[033] Precautions and safety [048] Release Note UCST & UNEM [202] UMUX 1500 Technical Description [203] UMUX 1200 Technical Description [204] UMUX 900 Technical Description [214] PCONV 131, 143 Technical Description [215] COBUX 212, 213, 219, 223 & COBUV 217, 218, 220, 224

Technical Description [302] UMUX User Guide [316] LOMIF 158, 152 & LOMI4 159, 151 User Guide [501] 75 Ohm Patch Panel User Guide [902] UMUX Network Functions


page 2 of 22 Technical Descriptions Units EN/LZTBU 250 201/5 RA

Introduction

The LOMIF (Low Order 2 Mbit/s InterFace) and LOMI4 units provide G.703 2 Mbit/s interfaces according to ITU-T G.703 for the UMUX 1500/1200 and UMUX 900.

The LOMIF unit has 8 x 2 Mbit/s interfaces and uses 1 slot in the subrack. The LOMI4 unit is the same width as the LOMIF but provides only 4 x 2 Mbit/s interfaces. In this document, the generic names

• LOMI<X> is used to name the following units and templates: − Units/templates with 8 E12/P12 subunits:

− LOMIF 158 (initially released with the UCST R5B) − LOMIF 152 (initially released with the UCST R5C SP02)

− Unit/templates with 4 E12/P12 subunits: − LOMI4 159 (initially released with the UCST R5B) − LOMI4 151 (initially released with the UCST R5C SP02)

If the context requires differentiation between the units and templates, the full names LOMIF 158, 152 or LOMI4 159, 151 are used.

• UMUX is used to name the − UMUX 1500 − UMUX 1200 − UMUX 900 (initially released with the UCST R5C)

For a technical description of the − UMUX 1500, refer to [202]. − UMUX 1200, refer to [203]. − UMUX 900, refer to [204].

The LOMI<X> units connect the E12 traffic signal of the electrical front interfaces for cross connection to the UMUX internal PBUS. Depending on the selected 2 Mbit/s modes, the cross connections are established on the P12 (2 Mbit/s), P0_nc (n x 64 Kbit/s) and the P0 (64 kbit/s) level. Cross connection for terminated P0_nc and P0 signals is possible for traffic signals with and without CAS in time slot 16.

The electrical front interface is implemented according to ITU-T G.703 with 120 Ohm and 75 Ohm line termination. The physical connection of coaxial cables requires an external patch panel.

The UCST R5C supports functional versions (with slightly different features) of the LOMI4 and the LOMIF: The LOMIF 158 supports the following functions and functional layers on each of the 8 subunits:

• Termination of the 2 Mbit/s physical layer according to ITU-T G.703 • The E12/P12 traffic layer of the LOMIF 158 provides control functions

and parameters for the 2 Mbit/s traffic signal as follows: − Control of states and functions (subunit, CAS, CRC4) − P12 (path) modes as set by the configuration:

− Terminated This mode supports the digital cross connection (DXC) on the 64 kbit/s level with the termination of the 2 Mbit/s path according to ITU-T G.704 with or without CAS in timeslot 16.

Overview

Definition of terms

Functions

LOMIF 158



This mode supports subnetwork connection protection for 64 kbit/s traffic signals (P0-nc SNCP/I).

− Monitored This mode supports the digital cross connection (DXC) on the 2 Mbit/s level with monitoring of the 2 Mbit/s path framed according to ITU-T G.704. In this case, the 2 Mbit/s signal is cross connected transparently with respect to data and timing information.

This mode supports subnetwork connection protection for the 2 Mbit/s traffic signals (P12s SNCP/N).

− Transparent This mode allows the digital cross connection (DXC) on 2 Mbit/s level. The signal is cross connected transparently in terms of data and timing information irrespective of its structure.

This mode supports subnetwork connection protection for the 2 Mbit/s traffic signals (P12x SNCP/I).

− Clock Master functionality allows the UMUX to re-synchronise 2 Mbit/s signals to the UMUX (master) clock.

− If the 2 Mbit/s path is terminated, the spare bits Sa4 to Sa8 of timeslot 0 can be used for the following applications identified as Sa-Modes: − SSI (Synchronisation Status Indication) uses 1 bit (Sa5).

The other 4 bits are user settable. This feature helps to prevent network synchronisation timing loops.

− ECC (Embedded Communications Channel). This inband channel with a bit rate of 16 kbit/s represents the physical layer of the management communications protocol stack. Sa4 bit is used for TTI (Trail Trace Identifier) and SSM

− SSM G.704 (Synchronisation Status Message). In this mode one of the 5 Sa bits carries the quality level of the timing source the trail is traceable to. The other 4 bits are user settable.

− V5.x applications use all 5 bits. − Fixed pattern on all 5 bits.

In the monitored mode of the 2 Mbit/s path, the Sa bit functions are available as far the inherent read-only function is useful.

− Setting of the three TS16 spare bits − Routing table to control the synchronisation information provided with

the traffic signals. − Control of the TTI (for the ECC Sa-mode only) − Status/Maintenance functions to

− Read status information related to the subunit (TTI, Sa-bits, loop status etc.)

− Apply loops in the signal path (front end and back end) − Performance Monitoring

− according to G.826 − count of frame slips

− PRA functionalities according to ETS 300 233 − NT1 Leased Line functionalities − Maintenance/Status function for the CRC-4 MFA (Multi-Frame

Alignment)



The LOMIF 152 provides the same features as the LOMIF 158 and additionally

• On the E12/P12 traffic layer: − AIS Insertion in the P12 signal leaving the LOMI<X> Interface B if the

P12 signal input to port A fails (port A and B are cross connected via P0_nc).

The LOMI4 159 provides the same features as the LOMIF 158 but has only 4 2 Mbit/s interfaces.

For the requirements on the UCST and ESW, refer to the paragraph “Versions and prerequisites” below.

The LOMI4 151 provides the same features the LOMIF 152 but has only 4 2 Mbit/s interfaces.

For the requirements on the UCST and ESW, refer to the paragraph “Versions and prerequisites” below.

Figure 1: Front View of the LOMI<X>

The LOMI4 unit has the same front panel and connector.

LOMIF 152

LOMI4 159

LOMI4 151

View of the unit



The LOMI<X> uses 1 slot in the UMUX subrack.

The LOMI<X> operates in slots that access the PBUS:

• UMUX 1500: − Slots 1 - 10 − Slots 12 - 20

• UMUX 1200: − Slots 5 - 9 − Slots 12

• UMUX 900: − Slots 6 - 9

Slot 11 has PBUS access but is reserved for the control unit.

The LOMIF 158 and LOMI4 159 are available from the UCST R5B and require the LOMIF_R4.Axx ESW or a higher version ESW.

The LOMIF 152 and LOMI4 151 are available from the UCST R5C (SP02) and require the LOMIF_R5.Axx ESW or a higher version ESW.

For more information on the requirements for hardware and software, refer to the corresponding release note and [202].

Slot allocation

Versions and prerequisites



Functional Description

The LOMI<X> front interfaces physically terminate E12 traffic signals according to ITU-T G.703. The LOMIF (LOMI4) provides 8 (4) electrical interfaces according to ITU-T G.703 for symmetrical and asymmetrical traffic signals. The unit checks the 2 Mbit/s receive paths for their signal integrity.

If required the LOMI<X> terminates traffic structured according to ITU-T G.704 with and without CAS.

Structured and unstructured 2 Mbit/s traffic signals are routed from the LOMI<X> to the UMUX internal PBUS for cross connection. The UCST creates the connection points for cross connection on the P12x (2 Mbit/s), P0_nc (n x 64 kbit/s) and the P0 (64 kbit/s) level.

With terminated (and partially with monitored) traffic signals the UMUX provides various Sa-modes that support the application specific use of the Sa bits. Typically the Sa-modes provide the transport of synchronisation information (SSI and SSM) for the traffic signal, V5 link information and PRA (including the leased line mode) maintenance information.

One of the Sa–modes allows you to use a dedicated in-band channel (16 kbit/s) in the TS0 for the UMUX management communication. To this end, you must establish an P0 (64 kbit/s) cross connection between the TS0 and the COBUV/COBUX PDH ECC interface.

Adding more LOMI<X> units in the subrack increases the access capacity for 2 Mbit/s and 64 kbit/s tributary traffic signals. A LOMIF fully replaces 2 LOMI4. The LOMIF and LOMI4 use the same connector pins for identical interface signals.

With 16 LOMIF units in the UMUX 1500 subrack the LOMIF can use the full PBUS capacity.

The LOMI<X> provides SNCP for traffic protection at the P12 and the P0_nc/P0 level.

The LOMI<X> connect to the PBUS of the UMUX. The bus structure is linear and the bus is available in all slots of the subrack but in slot 21:

• UMUX 1500: Slot 1 - 20 (available are max. 19 slots)



The PBUS has a maximum capacity of 128 x 2 Mbit/s (with CAS).

The UMUX subrack can be equipped with LOMI<X> E12 interfaces as follows:

• UMUX 1500 maximum E12 capacity The UMUX 1500 subrack provides up to 19 slots for LOMI<X>. This allows you to implement cross connects up to

− 128 x 2 Mbit/s with 16 LOMIF − 76 x 2 Mbit/s with 19 LOMI4 (technical value)

Applications

Traffic handling capacities PBUS

Subrack and units



• UMUX 1200 The UMUX 1200 subrack provides up to 6 slots for LOMI<X>. This allows you to implement cross connects up to

− 48 x 2 Mbit/s with the LOMIF − 24 x 2 Mbit/s with the LOMI4 (technical value)

• UMUX 900 The UMUX 900 subrack provides up to 4 slots for LOMI<X>. This allows you to implement cross connects up to

− 32 x 2 Mbit/s with the LOMIF − 16 x 2 Mbit/s with the LOMI4 (technical value)

Please note that

• The maximum capacity for LOMI4 units is technical, since the higher capacity requirements are more economically satisfied with the LOMIF.

• some control units manage a reduced PBUS capacity (refer, to the paragraphs below).

• powering options and redundancy of the control unit affect the number of slots (capacity) available.

The remaining slots are available for other traffic units.

The UMUX Network Elements provide different control units. Depending on the selected control unit the following restrictions apply:

• COBUV, COBUX The cross connect capacity of the COBUX 146, 213 and COBUV 237, 218 is limited to 40 x 2 Mbit/s on the PBUS (PHAU = 40).

• COBUL (not released for the UMUX 900)

• COBUQ (not released for the UMUX 1200 and 900) The cross connect capacity of the COBUQ 144 is limited to 32 x 2 Mbit/s on the PBUS (PHAU = 32).

Each E12/P12 subunit of the LOMI<X> provides two main sets of parameters that allow you to configure the handling of the traffic and the interpretation of its content. The P12-mode and the selected Sa-mode control the availability and parameters of the other traffic functions:

• P12-mode This mode defines the kind of 2 Mbit/s termination and defines the mapping on the internal traffic signal bus (PBUS).

− Terminated The 2 Mbit/s path is handled as an aggregate signal. The timeslot 0 is analysed in the receive direction and regenerated in the transmit direction.

Cross connection and protection switching is established on the P0 (64 kbit/s) or P0_nc (n x 64 kbit/s) traffic signal level.

For terminated signals and depending on the selected Sa-mode the functions below are available

Control units

Functions E12/P12 traffic signals



− CAS − CRC-4 − Spare Bits

Allows you to define the values of unused bits in the TS0 and TS16 (if applicable). For SSM it allows you to specify the Sa-bit that carries the SSM.

− Routing table for the selected NE timing source The NE sets the SSI/SSM data of the traffic signal leaving the NE according to this table.

− TTI (Trail Trace Identifier) supervision With TTI supervision you can identify each direction of the 2 Mbit/s path. For terminated signals you can define the - Transmitted TTI (15 characters) - Expected TTI (15 characters)

− AIS Insertion (LOMIF 152, LOMI4 151 only) With AIS Insertion enabled you can define the TS which the LOMI<X> interface monitors on its PBUS side for a TSF (Traffic Signal Fail) indication.

If the LOMI<X> detects TSF for that TS the P12 signal of the interface becomes AIS (all “1”).

− Monitored The 2 Mbit/s path is considered as a tributary signal which is not terminated but monitored. The timeslot 0 is analysed in the receive direction.

Cross connection and protection switching is established on the P12 (2 Mbit/s) traffic signal level.

For terminated signals and depending on the selected Sa-mode the functions below are available

− CAS − CRC-4 − Spare Bits (for SSM only)

Allows you to specify the Sa-bit that carries the SSM.

− TTI (Trail Trace Identifier) supervision With TTI supervision you can identify each direction of the 2 Mbit/s path. For monitored signals you can define the - expected TTI (15 characters)

− Transparent The 2 Mbit/s path is also considered as a tributary but with an unknown structure. In this case monitoring is not possible.

Both the monitored and transparent modes feature clock and data transparent cross connections. That means that the signal is in a plesiochronous phase relationship with the NE timing source.

− Clock Master Unlike the monitored and transparent mode, a Clock Master traffic signal is only cross connected transparently in terms of its structure. The 2 Mbit/s output signal is always resynchronised by the NE timing source. The input signal needs synchronisation to the output signal in order to avoid bit slips.



• Sa-mode This mode defines the use of the (spare) Sa-bits in the TS0 of structured traffic signals and adapts the interface mode to the features and applications provided via the Sa-bits. The features available with the Sa-mode depend on the selected 2 Mbit/s mode. Typical examples of Sa-mode based applications are

− SSI (Synchronisation Status Indication) via the Sa5 bit − SSM G.704 (Synchronisation Status Messages) via any Sa bit

according to ITU-T G.704. − ECC (Embedded Communication Channel)

SSM/TTI (Trail Trace Identifier) Transmission of a 16 kbit/s PDH ECC via the Sa5 … Sa8 bits and of

proprietary SSM/TTI in the Sa4 bit − V5.x applications

With fixed Sa bits for V5.1 and link identification control via the Sa7 bit for V5.2 applications

− PRA applications according to ETS 300 233 − Loop back indication in the Sa5 bit and indication and commands

according to ITU-T G.962 in the Sa6 bit. − NT1 Leased Line functionality.

− Fixed Sa bits

For more information of the generic functions of the

• E12/P12 traffic signal layer (P12 and Sa modes) and corresponding applications, refer to the [902].

• V5.x and corresponding applications, refer to [214]. The LOMI<X> provides only the E12/P12 traffic signal layer. The E12/P12 layer supports the following functions for each subunit:

• Definition of the subunit user name (16 characters) • Subunit enable/disable • P12 mode

− Terminated − Monitored − Transparent − Clock Master

• CAS on/off (availability depends on P12 mode) • CRC-4 enable/disable (availability depends on P12 mode) • Sa-modes for traffic signals in the

− terminated P12-mode − SSI − ECC − SSM G-704 − V5.x appl. − Fixed − NT1- U (PRA) − NT1-U (LL) − NT1-T (PRA) − NT1-T (LL)

Signal layer E12/P12



− monitored P12-mode − SSI − ECC − SSM G-704 − V5.x appl. − Fixed − LT-V3 − LT-U

• Use of T0 and T16 spare bits (availability depends on P12 mode) • Routing table for synchronisation information (availability depends on

P12 mode) • TTI Supervision (for ECC Sa-mode only)

− Transmitted TTI − Expected TTI

• AIS Insertion (LOMIF 152 and LOMI4 151 only) − Enabled − TS to monitor for TSF (Traffic Signal Fail)

Depending on the selected mode and the structure of the traffic signal, not all combinations of the above parameters and functions are available for configuration.

The LOMI<X> supports timing and synchronisation functions with terminated (monitored) traffic signals as follows:

• System synchronisation The LOMI<X> and its traffic signals can provide timing sources for the NE SETS and/or PETS timing system.

• Unit level − SSI and SSM for the LOMI<X> traffic signals − Routing table for forcing the QL information in the traffic signal output

to "Do not use" depending on the selected timing source.

The clock master mode is a synchronisation mode for traffic signals that resynchronises the 2 Mbit/s output signal to the NE timing source.

The LOMI<X> provides different functions for maintenance and operation control such as,

• Status indications The Status function allows you to monitor and control (if applicable) on the E12/P12 traffic signal layer

− operational state of the subunit (read back from the configuration) − received TTI (for framed signals only) − matches between the received and the expected TTI − status of Sa-bits − operational state of the PRA

− CRC-4 MFA The P12 and E12/P12 traffic signal layer provide a Status/Maintenance function for the CRC-4 MFA. You can monitor

Synchronisation and timing

Maintenance functions for traffic signals



the CRC-4 MFA for all the interfaces with CRC-4 and if required trigger a new MFA manually.

Upon start up of the subunit's layer 1 the LOMI<X> checks for 400 ms (according to the standard) for successful CRC-4 MFA on the interface. If MFA fails within this period, the subunit creates the "Non CRC-4 interworking" alarm.

With some non UMUX equipment, this initial CRC-4 MFA fails via the subunits interfaces and the resulting CRC-4 MFA failure persists in the NE. The CRC-4 MFA Status/Maintenance function allows you to check the alignment and to trigger a new attempt for synchronisation when required.

• Loops It is possible to apply loops into the signal path of each subunit as follows:

− 2 Mbit/s signal level − front end loop

The signal from the (front) interface is looped back to the interface before the LOMI<X> processes the signal.

The LOMI<X> receives AIS.

− back end loop The signal from the DXC is looped back to the DXC via the LOMI<X> circuit.

The front interface receives AIS.

− 64 kbit/s signal level (framed signals only) − front end loop (TS)

It is possible to configure individual loops per TS. These loops loop the signal from the (front) interface on the 64 kbit/s signal level back to the interface after the signal processing of the LOMI<X>.

The DXC receives AIS in the affected TS.

− PRA loops with the LT-U and NT1-T (PRA) Subunits in the PRA-mode support additionally PRA loops as follows:

− Loop 1: PRA loop implemented for the LT-U function block − Loop 2: PRA loop implemented for the NT1-T function block

With the active back end loop (refer to paragraph above) the front interface receives the signal from the LOMI<X> processing circuit.

The PRA loops are controlled via the QLE. (Sa6-Bit)!

− LL Loop with the NT1-T (Leased Lines) Subunits in the NT1-T Leased Line mode support the LL loop (same as the PRA loop in the NT1-T (PRA) mode).

The LL loop is controlled via the Sa6-Bit!

It is possible to enable or disable the NT1-T (LL) loop control via the Sa6-Bit.

Active loops (including the NT1 (PRA) and NT1 (LL) loops) create the Maintenance Function Active alarm on the system level.



The performance monitoring for the traffic signal of the LOMI<X> has 2 basic modes of operation which can create filtered or unfiltered data:

• The filtered mode provides performance monitoring according to ITU-T G.826 − EB (Errored Blocks) − BBE (Background Block Errors) − ES (Errored Seconds) − SES (Severely Errored Seconds) − UT (Unavailable Time)

The performance data is available for the near and the far end and it is possible to read the data as events or as ratios based on intervals of 15 minutes or 24 hours.

• The unfiltered mode of performance monitoring provides slip counts − Slip counts for the traffic signal in the positive sense − Slip counts for the traffic signal in the negative sense

The unfiltered performance data is available as a count of events for the near end only. However, it is possible to read the data based on intervals of 15 minutes or 24 hours.

The table below shows an overview of the functions available depending on Sa-mode.

Tab. 1: LOMIF/LOMI4 performance monitoring

Traffic Layer

P12-mode Filtered mode Unfiltered mode

Parameter Near Far Parameter Near Far

P12 Terminated EB, BBE, ES, SES, UT yes yes SLIP+, SLIP- yes -

Monitored EB, BBE, ES, SES, UT yes yes SLIP+, SLIP yes -

Transparent SES, UT yes - - - -

Clock Master EB, BBE, ES, SES, UT yes - - - -

SLIP Slip count (+ = positive, - = negative).

The LOMI<X> allows you to implement the following types of protection

• P0-nc SNCP/I 64 kbit/s and n x 64 kbit/s subnetwork connection protection (intrinsic) for terminated traffic signals.

The protection switching criteria provide the physical layer and faults detected by the supervision of the TS0.

• P12s SNCP/N 2 Mbit/s subnetwork connection protection (non-intrusive) for monitored traffic signals.

The protection switching criteria provide the physical layer and the faults detected by the monitoring function for the TS0.

Performance monitoring

Protection



• P12x SNCP/I 2 Mbit/s subnetwork connection protection (intrinsic) for transparent traffic signals.

The only switching criterion for protection switching is the failure of the physical layer (loss of signal).

Due to poor switching criteria, protection switching in transparent and Clock Master mode is not recommended.

Such a protection is implemented via the PBUS cross-connect of the NE. For more information on the principles of protection refer to [202].

The LOMI<X> has a full size connector frame on the front panel for the traffic signals. The connector frame provides the eight 2 Mbit/s interfaces of the LOMIF or the four 2 Mbit/s interfaces of the LOMI4.

The interfaces of the SbUs use different pins of the connector to terminate the traffic signals with 120 Ω or 75 Ω.

The LOMI<X> front interface provide terminals with 120 Ω and 75 Ω impedance for E12 tributary traffic signals according to ITU-T G.703.

Accordingly, 2 types of cables are provided to connect the 4/8 interfaces of the LOMI<X> subunits:

• 120 Ω signal termination The cable providing the 120 Ω termination to the 4/8 interfaces of the LOMI<X> subunits is an open ended twisted pair. The twisted pairs connect to an external patch panel.

The LOMIF cable connects to all 8 SbU interfaces of the LOMIF. With the LOMI4, only the interfaces of the first 4 SbUs are connected. The remaining 4 pairs are not used.

• 75 Ω signal termination The connection of coaxial cables requires an external patch panel which provides the required coaxial terminals. The connection between the LOMI<X> front interface and the patch panel is symmetrical.

To implement this adaptation, you have the options to

− connect the open ended twisted pair cable providing the 75 Ω termination for the 4/8 interfaces of the LOMI<X> subunits to your 75 Ω patch panel. The LOMIF cable connects to all 8 SbU interfaces of the LOMIF. With the LOMI4, only the interfaces of the first 4 SbUs are connected. The remaining 4 pairs are not used.

− implement the KEYMILE 75 Ω patch panel in the rack with the UMUX.

The KEYMILE patch panel is modular and provides cable modules which connect the 75 Ω termination for the 4/8 interfaces of the LOMI<X> subunits to the patch panel in the rack.

For more information of the 75 Ω patch panel, refer to [501].

Due to the mismatching impedances of the termination and cable you must keep the connection cable as short as possible (a few metres). This

Interfaces Traffic signals

Cables



requires that the 75 Ω patch panel installed close to the UMUX (e.g. in the same rack).

If the symmetrical connection cables are longer than a few meters, it is not possible to guarantee a LOMI<X> interface performance according to ITU-T G.703.

The LOMI<X> and the SYNAM front connectors have the same pin layout for traffic signals and use the same signal cables and 75 Ω patch panel cable modules.

The LOMI<X> provides the standard LED indicators on the front panel for

1 Unit failure 2 Failures of the subunit or the traffic signal

For more information on the LED indicators refer to [302].

• Configuration of the unit via the UCST/UNEM. • Inventory data stored on the unit. • Download for embedded SW. • Same ESW for the LOMIF and LOMI4. • Fault indication LEDs on the front panel. • PBUS interfaces for traffic signals. • PHAU (PBUS Highway Access per Unit)

− LOMIF: 8 − LOMI4: 4

• 2 Mbit/s TX/RX interfaces according to ITU-T G.703 − LOMIF: 8 interfaces per unit − LOMI4: 4 interfaces per unit

• 75 Ω or 120 Ω line termination depending on the cable wiring on the connector set. A 19-inch patch panel is available and allows the termination of the asymmetrical signals for different coaxial connector types. For more information, refer to [501].

• Front panel access. • No hardware settable options on the unit. All unit parameters are

software settable with the UCST/UNEM.

Optical fault indicators

Complements to features System level features

Unit level features



Summary of Standards

The LOMI<X> conforms to the following recommendations (conformance to applicable parts of the standards):

• ETS/EN − ETS 300 166 (08/93)

Transmission and Multiplexing (TM); Physical and electrical characteristics of hierarchical digital interfaces for equipment using the 2048 kbit/s - based plesiochronous or synchronous digital hierarchies

− ETS 300 167 (08/93) Transmission and Multiplexing (TM); Functional characteristics of 2048 kbit/s interfaces

− ETS 300 248 (10/93) Business TeleCommunications (BTC); Open Network Provision (ONP) technical requirements; 2048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface

− EN 300 417-1-1 V1.1.2 (11/98) Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 1-1: Generic processes and performance

− EN 300 417-2-1 V1.1.2 (11/98) Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 2-1: Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical section layer functions

− EN 300 417-5-1 V1.1.2 (11/98) Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 5-1: Plesiochronous Digital Hierarchy (PDH) path layer functions

− ETS 300 461-1 (10/96) Transmission and Multiplexing (TM); Flexible Multiplexer (FM) equipment; Part 1: Core functions, 2048 kbit/s aggregate interface functions, tributary interface functions and special functions

− ETS 300 461-2 (10/96) Transmission and Multiplexing (TM); Flexible Multiplexer (FM) equipment; Part 2: Management and control functions

• ITU − ITU-T G.702 (1988)

General aspects of digital transmission systems - Terminal equipments - Digital hierarchy bit rates

− ITU-T G.703 (10/98) Digital transmission systems – Terminal equipments – General Physical/electrical characteristics of hierarchical digital interfaces

− ITU-T G.704 (10/98) Digital transmission systems – Terminal equipments – General Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels

− ITU-T G.706 (11/95) General aspects of digital transmission systems - Terminal

Generic and architecture



equipments - Frame alignment and cyclic redundancy check (CRC) procedures relating to basic frame structures defined in recommendation G.704

− ITU-T G.732 (1988) General aspects of digital transmission systems - Terminal equipments - Characteristics of primary PCM multiplex equipment operating at 2048 kbit/s

− ITU-T G.736 (03/93) General aspects of digital transmission - Characteristics of a synchronous digital multiplex equipment operating at 2048 kbit/s

− ITU-T G.775 (10/98) Digital transmission systems - Terminal equipments - Operations, administration and maintenance features of transmission equipment - Loss of Signal (LOS), Alarm Indication Signal (AIS) and Remote Defect Indication (RDI) defect detection and clearance criteria for PDH signals

− ITU-T G.962 (03/93) Digital Sections and Digital Line Systems - Access Digital Section For ISDN Primary Rate At 2048 kbit/s

• ETS

− ETS 300 233 (05/94) Integrated Services Digital Network (ISDN); Access digital section for ISDN primary rate

• ETS/EN

− EN 300 417-6-1 V1.1.2 (11/98) Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 6-1: Synchronisation layer functions

• ITU − ITU-T G.823 (03/93)

The control of jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy

Refer to [202]

Refer to [202]

Refer to [202]

Refer to [202]

Refer to [202]

Access digital section for ISDN primary rate

Synchronisation and timing

EMC

Emission

Immunity

Safety

Ambient conditions



Technical Specification

Parameters controlled via UCST Unit parameters

Parameters settable for each of the 8 subunits: - Name (e.g. name of the MDF) : up to 16 characters - State : enabled, disabled

- P12 mode : Transparent Monitored Terminated Clock Master

- CAS : on, off - CRC4 : enabled, disabled - TS0 use of Sa- bits - Generic modes : SSI

ECC SSM V5.x appl. Fixed

- NT1 and LT modes - Terminated P12 mode : NT1-T (PRA)

NT1-U (PRA) NT1-T (LL) NT1-U (LL)

- Monitored P12 mode : LT-V3 LT-U

- Spare bits (Sa-bits available depend on use of Sa-bits) - Sa-spare bits in TS0 : 1, 0 - Spare bits in TS16 : 1, 0 - Synchronisation - Synchronisation information in output signal - via routing table (for timing signal quality) : - indication : “do not use”

“can be used”

- TTI parameters (for ECC mode only) - TTI supervision : enabled, disabled - Transmitted TTI : up to 15 characters - Expected TTI : up to 15 characters

- LOMIF 152 and LOMI4 151 only for terminated P12 mode: - AIS Insertion : enable -.Signal Fail : TS0 … TS 31

Unit alarms

Alarm layers : Board 2 Mbit/s

Settable parameters per alarm and subunit: - Supervision status : monitored (MON)

not monitored (NMON) - Severity : urgent, non urgent

logbook entry only - Time filters - Persist Time : trapped

0.1 … 30 s - Absent Time : 0.2 … 30 s





Performance Monitoring

Layers with performance monitoring : 2 Mbit/s Settable parameters for Performance (availability of parameters depends on evaluation) - Location : near end / far end - Evaluation of performance parameters : filtered / unfiltered - Time interval for evaluation : 15 min / 24 h - Presentation of results : events / ratios - Interval presentation : selectable - 15 min intervals : current

all recent 1 … 96

- 24 h intervals : current 1

Status/Maintenance function

Layers with maintenance/status functions : E12/P12

Maintenance functions (if applicable) - E12/P12

- Generic : received TTI TTI state Sa bits Loops

- Status indication : PRA link - Status and control for : CRC-4 MFA

Modes and traffic signals E12/P12 traffic layer

Number of subunits - LOMIF : 8 - LOMI4 : 4

Handling of traffic signals on the E12/P12 layer

- Framed signals (G.704 type) : terminated monitored transparent Clock Master

- Unstructured signals (unknown structure) : transparent Clock Master

PRA

PRA function - Type of access : PRA direct access - Functional groups of the PRA : NT1

LT - Implementation of the function blocks (2 Mbit/s subunits) - NT1 function (P12-mode terminated) : NT1-T (PRA)

NT1-U (PRA) - LT function (P12-mode monitored) : LT-V3

LT-U - Sa4, Sa7 and Sa8-bits - between ET → NT2 : transparent up to

NT1-T (PRA) - between NT2 → ET : set to "1" (→ NT2) - M-channel, AUXP : not supported



NT1 Leased Lines

NT1 LL function

- Functional group of the NT1 Leased Lines : NT1 (LL) - Implementation of the function blocks (2 Mbit/s subunits) - NT1 function (P12-mode terminated) : NT1-T (LL)

NT1-U (LL)

- Sa4, Sa7 and Sa8-bits - between network → NT2 : transparent up to

NT1-T (LL) set to "1" (→ NT2)

- between NT2 → network : settable in NT1-U (→ network)

- A-bit handling and functions : according to NT1 LL specification

- Loop handling and functions : according to NT1 LL specification

Loop control via Sa6-bit for the NT1-T (LL) : enable/disable

- Reception of Sa6 = 1000 on NT1-T (LL) : selectable - ignore - send AIS

V5.x applications

Handling of V5.x links : Fixed Sa bits in the TS0

Modes of the 2 Mbit/s layer : terminated (monitored)

Clock Master mode

Clock Master function (not for LOMIF 101, 120) - Type of traffic signal : 2 Mbit/s any structure - Influence on - Traffic data : transparent - Timing of the traffic signal : re-timed to NE clock

Performance monitoring

Filtered : ITU-T-G.826 Unfiltered : Slip counts

positive/negative

Maintenance functions

Status monitoring : TTI Sa-bits operational state

Loops - via UCST - 2 Mbit/s : front end

back end - 64 kbit/s level (framed signals only) : front end

-via QLE or equivalent - 2 Mbit/s : PRA loop

LL loop



Physical 2 Mbit/s signals

Number of physical interfaces (according to ITU-T G.703) - LOMIF : 8 - LOMI4 : 4

Bit rate : 2048 kbit/s +/-50 ppm Code : HDB3 Impedance (depending on wiring of cables to connector set) : 120 Ω symmetric or

75 Ω asymmetric Input voltages - 120 Ω : 3 Vp - 75 Ω : 2.37 Vp Input signal attenuation : 0...6 dB at 1024 kHz Jitter - any 2 Mbit/s mode : according to ITU-T G.823- 2 Mbit/s terminated mode only : according to ETS 300

248 Maximum line lengths for admissible signal attenuation of 6 dB at 1024 kHz - 75 Ω with coaxial cables : 390 m - 120 Ω with balanced HF cables : 180 m

Power consumption

Power supply range Vbat : not applicable

LOMIF

Current consumption (typical) - +5 VCC power rail from POSUS : 460 mA - -5 VCC power rail from POSUS : 68 mA - -48 Vbat (direct from battery) : 0 mA

Typical total power requirements from battery with - -Nominal voltage Vbat = -48 V - 71% efficiency of the POSUS (0.460+0.068) A x 5.1 V / 0.71 : 3.8 W

LOMI4

Current consumption (typical) - +5 VCC power rail from POSUS : 300 mA - -5 VCC power rail from POSUS : 38 mA - -48 Vbat (direct from battery) : 0 mA

Typical total power requirements from battery with - -Nominal voltage Vbat = -48 V - 71% efficiency of the POSUS (0.300+0.038) A x 5.1 V / 0.71 : 2.5 W

Mechanical Parameters Construction

Construction practice : 19 inch

Dimensions

Height of unit (1 HU = 44.45 mm) : 6 HU Width of unit (1 TE = 5.08 mm) : 4 TE (1 slot) Size of the PCB : 233 mm x 220 mm



Weight

Unit hardware - LOMIF : 350 g - LOMI4 : 320 g

Reliability

MTTF at 35°C ambient temperature (unit) - LOMIF with hardware up to R1A : ≥ 83 years - LOMIF with hardware R1B and up : ≥ 104 years - LOMI4 : ≥ 132 years

td_lomif_lomi4

Documents

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technical

access digital

isdn primary

plesiochronous

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ne timing

higher version