Black Box DESKTOP TELCO User Manual
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Black Box DESKTOP TELCO User Manual

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TELCOLINK DT - AccessDSL NTU
DESKTOP TELCO MODEMS
E1/G.703/V.35,36/X.21/V.24 NTU
MDS92xxx xDSL TRANSMISSION SYSTEMS

USER MANUAL

Version
Revision
Document name
Version: 2.5
User Manual
2.5
30 Aug 2008
MDS923AE-xxx-R2_MDS921AE-xx-R2-V2-3
Page 1 of 66

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Summary of Contents for Black Box DESKTOP TELCO

  • Page 1: User Manual

    User Manual TELCOLINK DT - AccessDSL NTU DESKTOP TELCO MODEMS E1/G.703/V.35,36/X.21/V.24 NTU MDS92xxx xDSL TRANSMISSION SYSTEMS USER MANUAL Version Revision 30 Aug 2008 Document name MDS923AE-xxx-R2_MDS921AE-xx-R2-V2-3 Version: 2.5 Page 1 of 66...
  • Page 2 User Manual TELCOLINK DT - AccessDSL NTU © Copyright ©2008 by Black Box Network Services. The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated into any language, or transmitted in any form or by any means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written permission of Black Box Network Services.

  • Page 3: Table Of Contents

    User Manual TELCOLINK DT - AccessDSL NTU VERSION CONTROL......................... 6 SELECTION GUIDE ......................8 2 PANEL DESCRIPTION ....................8 CONFIGURATION OPTIONS ................... 10 DSL .......................... 10 3.1.1 Master / Slave ....................... 10 3.1.2 Normal / Dual pair / Multipoint mode ..............10 3.1.3 Fixed rate / Adaptive setting ..................
  • Page 4 User Manual TELCOLINK DT - AccessDSL NTU ........................24 ENERAL & O ..................24 TRUCTURE RGANIZATION 7.2.1 CLI Timeout ......................24 7.2.2 Password protection and access rights ..............25 7.2.3 Command set tree for Normal and Dual modes (* - Administrator access only) ..25 7.2.4 Command set tree for Multipoint mode (* - Administrator access only) ....
  • Page 5 User Manual TELCOLINK DT - AccessDSL NTU FIGURES Figure 2-1: Rear Panel ....................... 9 Figure 2-2: Tabletop Front View ....................9 Figure 3-1: Synchronous Operation ..................12 Figure 3-2: Synchronous Operation ..................13 Figure 3-3: Plesiochronous Operation ..................13 Figure 3-4: Nx64 Block Diagram ....................16 Figure 3-5: standard Test Loops ....................

  • Page 6: Version Control

    OTHER ENVIRONMENT AND/OR CHASSIS/HOUSING THAN PROVIDED BY BLACK BOX NETWORK SERVICES MIGHT LEAD TO HARMFUL CONDITIONS. FAILURE TO FOLLOW THESE PRECAUTIONS MAY RESULT IN DEATH, SEVERE INJURY OR PROPERTY DAMAGE. BLACK BOX NETWORK SERVICES REFUSES TO TAKE ANY RESPONSIBILITY, FURTHERMORE, NO WARRANTY IS GRANTED IN SUCH CASE! Please read this manual carefully before operating the system.
  • Page 7 User Manual TELCOLINK DT - AccessDSL NTU Version: 2.5 Page 7 of 66...

  • Page 8: Selection Guide

    User Manual TELCOLINK DT - AccessDSL NTU 1 SELECTION GUIDE DESKTOP (TELCOLINK), E1, Nx64, V24, Ethernet Bridge MDS921AE-E1-R2 MDS923AE-V35X21-R2 MDS923AE-V35X21-MP-R2 MDS923AE-E1-MP-R2 Version: 2.5 Page 8 of 66...

  • Page 9: 2 Panel Description

    User Manual TELCOLINK DT - AccessDSL NTU 2 PANEL DESCRIPTION Power Mini-Fit xDSL RJ-45 4 pin Connector 8 pin Connector Local/Remote Optional N64/RS232 Sub-D25 E1 120 Ohm Sub-D15 Monitor Sub-D9 Power Switch EarthTerminal female Connector male Connector female Connector Figure 2-1: Rear Panel Tricolour Tricolour LED for...

  • Page 10: Configuration Options

    User Manual TELCOLINK DT - AccessDSL NTU 3 CONFIGURATION OPTIONS The following sections describe the various configuration options. The operating modes for the NTU are configurable via the V.24 monitor interface on the rear panel as well as from remote LTU (or NTU) via DSL in case of establishing of the link.

  • Page 11: E1-Interface (2 Mbit/S G.703 / G.704)

    User Manual TELCOLINK DT - AccessDSL NTU Rate adaptation is not supported in Dual Pair Mode, so in this mode both system units must be set to the same base rate. E1-Interface (2 Mbit/s G.703 / G.704) The following configuration options refer to the E1 side only and do not affect the xDSL operating mode.

  • Page 12: Ais Generation

    User Manual TELCOLINK DT - AccessDSL NTU 3.2.4 AIS Generation If this option is enabled, an unframed AIS (all 1's) will be transmitted on the E1 side, irrespective of whether the system is configured in the transparent or framed mode. AIS generation will be activated on the following conditions: ...

  • Page 13: Figure 3-2: Synchronous Operation

    User Manual TELCOLINK DT - AccessDSL NTU o xDSL recovered clock (if synchronous mode is used (“PLL” option at slave side is off)). The primary RX clock source for module with E1 interface is:  For Master: o E1 2 Mbit transmit clock (if synchronous mode is used (“PLL” option at master side is off)) or Internal clock (in case of E1 signal loss);...
  • Page 14 User Manual TELCOLINK DT - AccessDSL NTU transmit clock except if one xDSL equipment is an LTU using the "External Clock" option. Otherwise there will be no defined clock. N o t e : O r i o n 1 r e p e a t e r s s u p p o r t o n l y s y n c h r o n o u s...

  • Page 15: Nx64/Rs232 Interface (Dce)

    User Manual TELCOLINK DT - AccessDSL NTU Nx64/RS232 Interface (DCE) The following configuration options refer to the Nx64/RS232 (V.35/V.11/V.28/RS232 – SW configurable) side only and do not affect the xDSL operating mode. 3.3.1 Nx64/RS232 Services One can choose between three available services: ...

  • Page 16: Nx64 Block Diagram

    User Manual TELCOLINK DT - AccessDSL NTU xDSL Service Clock Mode Clock Mode Clock Direction Clock Mode don’t care Slave internal Master don’t care Slave external Slave Nx64 only Master external codirectional Slave Master don’t care Master don’t care external contradirectional don’t care don’t care...

  • Page 17: Automatic V.54 Loops

    User Manual TELCOLINK DT - AccessDSL NTU 3.3.6 Automatic V.54 loops System supports V.54 loops, managed by 140-142 lines. Supporting of V.54 loops is SW programmable. Slave Master xDSL Loop 1 Loop 2 Loop 1 Master Slave State Name State Description Normal Data Transmission Loop1 at Master Side...

  • Page 18: Test Loops

    3.4.2 Analog Loop Back To test the Black Box Network Services equipment itself, the Analog Loop Back can be used. To perform this test, the xDSL - cable has to be disconnected from the unit and the test can be activated with the appropriate monitor command (see chapter 'Black Box Network Services Monitor').

  • Page 19: Performance Monitoring

    G.826 error performance parameters are intended to be used for long-term evaluation of operating xDSL links. Refer also to the “SQ” and “G826” monitor commands described in the “Black Box Network Services Monitor” section. G.826 Performance Monitoring The G.826 error performance parameters provide quantitative performance information of a specific loop.

  • Page 20: Alarms

    User Manual TELCOLINK DT - AccessDSL NTU 5 ALARMS General This chapter describes a possible implementation for the alarm signalization. LEDs The two NTU LEDs 'far end (FE) status' and 'near end (NE) status' are used to display normal operation condition and alarm condition. Each LED can be green, amber or red when lit according to the following table.

  • Page 21: Local Led - Alarm Conditions

    User Manual TELCOLINK DT - AccessDSL NTU 5.2.3 Local LED - Alarm Conditions 5.2.3.1 Local (NE) LED An alarm condition is displayed with the Local LED if one of the following conditions occurs: Major alarm (red):  Hardware or software failure (blinking) ...

  • Page 23: Ntu Power Concept

    User Manual TELCOLINK DT - AccessDSL NTU 6 NTU POWER CONCEPT Each NTU is fed via the power supply Molex connector on the rear panel with 48 VDC. The NTU converts these voltages to its onboard supply with its DC/DC converter. In case of a failure of the NTU's onboard power supply, all LEDs on the front-panel will be extinguished.

  • Page 24: Monitor

    Configuration management Accounting management Security management As Black Box Network Services does not support accounting management AM is not in the monitor's main menu. At any time, the <H> (“Help”) command shows and explains the available commands and their parameters.

  • Page 25: Password Protection And Access Rights

    User Manual TELCOLINK DT - AccessDSL NTU 7.2.2 Password protection and access rights There are two access levels to the system: Administrator (username: ADMIN) end User (username: USER). All the commands are available for Administrator while Configuration commands are not accessible by User.

  • Page 26: Command Set Tree For Multipoint Mode (* - Administrator Access Only)

    ALARM URGENT STATUS LINK DOWN MODEL-DESC. Black Box Network Services Tabletop Dual E1 / Nx64 120 Ohm Copyright (C) 2006 by Black Box Network Services ------------- Main Menu ----------------- 1. Performance management (PM) 2. Fault and maintenance management (FMM) 3. Configuration management (CM) 4.

  • Page 27: Dual Channel Syntax

    User Manual TELCOLINK DT - AccessDSL NTU To select the sub-menus type 1 to 6. Note: Each command must be terminated by a carriage return. 7.2.6 Dual Channel SYNTAX If a Dual channel unit works in multipoint mode and the parameter can be entered for channel A or B the command syntax can vary.

  • Page 28: Performance Management Pm

    User Manual TELCOLINK DT - AccessDSL NTU 7.2.8 Performance management PM Performance management activated Enter <M> to return to MAIN, or <H> for HELP information Type <H> and the monitor lists all available commands in the performance sub-menu. 7.2.8.1 G826 Command SYNTAX: G826 or G The G826 command displays the ITU-T G.826 error performance on xDSL line side: CO_01_PM>...
  • Page 29 User Manual TELCOLINK DT - AccessDSL NTU Available time 00000000 00000000 Unavailable time 00000135 00000135 ---------------------------------------------------------------------- CP_PM> If CRC4 detection mode is off, the following parameters are displayed: CP_PM>G826 E1 ---------------------------------------------------------------------- G.826 Error Performance ---------------------------------------------------------------------- Errored blocks 00000000 Errored seconds 00000000 Severely errored seconds : 00000000...
  • Page 30 User Manual TELCOLINK DT - AccessDSL NTU For the Nx64 interface only the alarm history is available. Version: 2.5 Page 30 of 66...
  • Page 31 User Manual TELCOLINK DT - AccessDSL NTU 7.2.8.5 RESETHIST Command SYNTAX: RESETHIST or RH This command clears the history data. 7.2.8.6 DATE Command SYNTAX: DATE [date] or DA [date] Without parameters this command displays current date. With parameters this command sets the date. FORMAT: DD/MM/YYYY 7.2.8.7 TIME Command SYNTAX: TIME [time] or TI [time]...

  • Page 32: Fault And Maintenance Management Fmm

    User Manual TELCOLINK DT - AccessDSL NTU 7.2.9 Fault and maintenance management FMM Fault and maintenance management activated Enter <M> to return to MAIN, or <H> for HELP information Type <H>and the monitor lists all available commands in the fault and maintenance sub-menu. 7.2.9.1 SQ Command The SQ command allows the user to toggle the signal quality trace on and off: CO_01_FMM>...
  • Page 33 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.3 STATUS Command SYNTAX: STATUS or ST The STATUS command displays the actual system status: CO_FMM>STATUS ---------------------------------------------------------------------- Local System Status ---------------------------------------------------------------------- LOSD SEGA SEGD Tx power 07.5 dBm Rx gain 07.3 dB Loop attn.: 00.2 dB 35.8 dB Bitrate...
  • Page 34 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.4 ALARM Command SYNTAX: ALARM or AL The ALARM command displays the actual alarm status: CO_01_FMM> ALARM ---------------------------------------------------------------------- Local Alarm Status ---------------------------------------------------------------------- LOS-S : off LFA-S : off AIS-S : off AIS-R : off BER-S : off DTR-OFF...
  • Page 35 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.5 TLM Command SYNTAX: TLM or T This command displays table of repeaters’ external alarm inputs. CO_FMM>TLM Distance Ext. Alarm Status ---------------------------- REPTR | ALM1 | ALM2 | ALM3 | ---------------------------- REPT 1| off | det REPT 2| REPT 3|...
  • Page 36 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.8 TLMSET Command SYNTAX: TLMSET [Rn-k] [abc] or TS [Rn-k] [abc] This command sets the external alarm configuration. Definitions: ignore represents external alarm status in the external alarm table represents external alarm status in the external alarm table and consider as Minor alarm represents external alarm status in the external alarm table and consider as Major alarm CO_FMM>TLMSET R02-R03 321 Reactions table for distance ext.
  • Page 37 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.9 LOOP1 Command SYNTAX: LOOP1 [E/N] [ON/OFF] or L1 [E/N] [ON/OFF] The LOOP1 command starts the local loopback (see section 3.4.1: Standard Test Loops): CO_FMM>LOOP1 E ON Loop 1 on E1 interface on CO_FMM>...
  • Page 38 User Manual TELCOLINK DT - AccessDSL NTU 7.2.9.12 RESTART Command SYNTAX: RESTART or RE By typing RESTART, the actual channel will be restarted. CO_01_FMM> RESTART Restarting channel CO_01_FMM> Note: In Multipoint mode and for Repeater RESTART command has a parameter, which assign necessary xDSL interface.

  • Page 39: Configuration Management Cm

    User Manual TELCOLINK DT - AccessDSL NTU 7.2.10 Configuration management CM Configuration management activated Enter <M> to return to MAIN, or <H> for HELP information Type <H> and the monitor lists all available commands in the configuration sub-menu. 7.2.10.1 CONFIG Command SYNTAX: CONFIG or C The CONFIG command displays the configuration of the unit.
  • Page 40 User Manual TELCOLINK DT - AccessDSL NTU Set automatic E-Bit insertion on / off 7.2.10.7 AISGEN Command SYNTAX: AISGEN [ON/OFF] or AG [ON/OFF] Set AIS generation on / off 7.2.10.8 AISDET Command SYNTAX: AISDET [ON/OFF] or AD [ON/OFF] Set AIS detection on / off 7.2.10.9 PCM Command SYNTAX: PCM [30/31] This command enables/disables signaling timeslot processing:...
  • Page 41 User Manual TELCOLINK DT - AccessDSL NTU AUTO: standard config (TS16 or last TS if baserate < 16) 1 – 31 for DSL A 1 – 31 for E1/G703 Version: 2.5 Page 41 of 66...
  • Page 42 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.14 SERVICE Command SYNTAX: SERVICE [E/N/M] or SRV [E/N/M] Select one of four available services: E1 only Nx64 only Multiservice Nx64 & fE1 (fractional E1) 7.2.10.15 TYPE Command SYNTAX: TYPE [n] or TP [n] This command sets the Nx64 interface type.
  • Page 43 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.18 AUTOLOOP Command SYNTAX: AUTOLOOP [ON/OFF] or AUL [ON/OFF] This command enables/disables the usage of lines 140/141 for The automatic V.54 loop control. 7.2.10.19 SLOTUSAGE Command SYNTAX: SLOTUSAGE [ON/OFF] or SU [ON/OFF] This command enables/disables the usage of timeslot 0 for the Nx64 payload when service Nx64 only is selected.
  • Page 44 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.25 RS232RATE Command SYNTAX: RS232RATE [n] or RSR [n] This command sets the RS232 rate. Parameters: 110, 150, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600,115200 7.2.10.26 RS232ERATE Command SYNTAX: RS232ERATE [n] or RSR [n] This command sets the excess rate of the RS232 interface.
  • Page 45 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.30 SETADDR Command SYNTAX: SETADDR [n] or SA [n] This command sets the virtual modem address. Parameters: Disable “%xx” command for entering NTU (Normal Mode!!!). 01 – 99 Address 1-99 A0-A9 Address 100 -109 B0-B9 Address 110 -119 C0-C7...
  • Page 46 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.34 SOME Command SYNTAX: SOM [type] Parameters: <no> Show available Operation & Monitoring System type: Monitoring System type 0-none 1-M2M 7.2.10.35 DEFAULT Command SYNTAX: DEFAULT [n] or DF [n] This command sets default configuration. There are two default configurations for multipoint mode (n=0..1) and six for all other modes (n=0..5).
  • Page 47 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.35.2 Nx64 only Normal or Dual Pair mode DEFAULT Interface Type V.35 V.35 V.35 V.35 V.35 V.35 Bitrate 512 kbit/s 1024 kbit/s 2048 kbit/s 512 kbit/s 1024 kbit/s 2048 kbit/s Clock Edge inverted inverted inverted inverted...
  • Page 48 User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.35.3 fE1 &Nx64 Normal or Dual Pair mode DEFAULT Framing ITU-T G.704 ITU-T G.704 ITU-T G.704 ITU-T G.704 ITU-T G.704 ITU-T G.704 CRC4 E-Bit Insertion AIS Detection AIS Generation Mode Interface Type V.35 V.35 V.35 V.35...

  • Page 49: Security Management Sm

    User Manual TELCOLINK DT - AccessDSL NTU 7.2.10.35.4 Multipoint Mode DEFAULT Framing ITU-T ITU-T G.704 G.704 CRC4 E-Bit Insertion AIS Detection AIS Generation PCM Mode PCM31 PCM30 Payload Idle pattern Mode Master/Slave Master Master Autorestart Base Rate Rate Adaption off off off off Annex A_B A_B...

  • Page 50: Software Update

    8 SOFTWARE UPDATE General The software of the Black Box boards has the possibility for field updates. To do a field update, you need only a Windows 95/98/NT computer, the Flash Loader program installed, a connection between the Windows computer and the LTU/NTU Monitor connector and the newest release of the Black Box software.
  • Page 51 User Manual TELCOLINK DT - AccessDSL NTU 5. Choose Select Device in the Setting menu, select the device AccessDSL and press Ok. 6. Choose the newest software version and press Open. Version: 2.5 Page 51 of 66...
  • Page 52 User Manual TELCOLINK DT - AccessDSL NTU 7. Execute the command Connect COM in the menu Action. 8. Switch on the power of your LTU/NTU. 9. The following message appears on the screen, then press Ja. Version: 2.5 Page 52 of 66...
  • Page 53 User Manual TELCOLINK DT - AccessDSL NTU 10. During the download the FE-LED is green blinking and the NE-LED is amber. On the Windows screen you see the ongoing download. 11. If the download is successfully finished the Flash Loader program sends the following message: 12.

  • Page 54: Connectors' Description

    User Manual TELCOLINK DT - AccessDSL NTU 9 CONNECTORS' DESCRIPTION xDSL Connector Signal Description Not used Shield DSL cable shield Front View RJ45-8 TXA.a Loop B, Tip (C-side) (four-wire unit only) LA.a Loop A, Tip (N-side) LA.b Loop A, Ring (N-side) TXA.b Loop B, Ring (C-side) (four-wire unit only) Shield...

  • Page 55: Nx64/Rs232 Dce Connector

    User Manual TELCOLINK DT - AccessDSL NTU Nx64/RS232 DCE Connector V.24 (V.35/V.36) X.21 Direction ITU-T # Description Name Description Name Shield Shield Signal Gnd Signal Gnd 103a Transmit Data (A) TD(A) Transmit (A) TO DCE 103b Transmit Data (B) TD(B) Transmit (B) TO DCE 104a Receive Data (A)

  • Page 56: Monitor Interface

    User Manual TELCOLINK DT - AccessDSL NTU Monitor Interface Signal Description Functional Protective Earth EIA-232 Transmit Data EIA-232 Receive Data ALACOM Common Contact* SGND EIA-232 Signal Ground ALMAJ_NC Major Alarm Contact, normally closed* ALMAJ_NO Major Alarm Contact, normally open* ALMIN_NC Minor Alarm Contact, normally closed* ALMIN_NO Minor Alarm Contact, normally open*...

  • Page 57: Technical Specification

    User Manual TELCOLINK DT - AccessDSL NTU 10 TECHNICAL SPECIFICATION 10.1 Interfaces 10.1.1 xDSL Line Interface Specification ITU-T G.SHDSL, Reek G.991.2 Option 4-wire Interface (separate Tx and Rx Pairs) Line Code TC-PAM Impedance 135 13.5 (Annex A) or 14.5 (Annex B) dBm @ 135  Transmit Power Number of Pairs 1 or 2 (option: 2 or 4)

  • Page 58: Environmental

    User Manual TELCOLINK DT - AccessDSL NTU 10.3 Environmental 10.3.1 Climatic Conditions (-35C … +75C) Storage: ETS 300 019-1-1 Class 1.2 (-40C … +80C) Transportation: ETS 300 019-1-2 Class 2.3 (-25C … +75C) Operation: ETS 300 019-1-3 Class 3.2 Higher Operation Temperaturrange available on request. 10.3.2 Safety / EMC According to EN60950 / EN 55022 , Class B 10.4 Physical Dimensions and Weight...

  • Page 59: Nx64 Cables

    User Manual TELCOLINK DT - AccessDSL NTU 11 NX64 CABLES V.35 DTE MRAC-34, DB25, female male (a/b) (a/b) FGND SGND 2/14 V.35/ISO 2593 3/16 34 Pin Connector female 24/11 Y/AA 15/12 17/9 V.35 DCE MRAC-34, DB25, male male (a/b) (a/b) FGND SGND 3/16...
  • Page 60 User Manual TELCOLINK DT - AccessDSL NTU V.36/RS449 DTE DB37, female DB25, male (a/b) (a/b) FGND SGND SGND(a) V.36/ISO 4902 SGND(b) 37 Pin Connector 4/22 2/14 6/24 3/16 7/25 4/19 9/27 5/13 11/29 6/22 female 12/30 20/23 13/31 8/10 17/35 24/11 5/23 15/12...
  • Page 61 User Manual TELCOLINK DT - AccessDSL NTU X.21 DTE DB15, female DB25, male (a/b) (a/b) FGND 6/13 17/9 X.21/ISO 4903 4/11 3/16 15 Pin Connectors 2/14 3/10 4/19 5/12 5/13 7/14 24/11 female Note: join together pins 22&23 and 6&20 at DB-25 side X.21 DCE DB15, male (a/b) DB25, male (a/b)
  • Page 62 User Manual TELCOLINK DT - AccessDSL NTU V.28 DTE synchronous DB25, female DB25, male SGND 105/106 25 Pin Connector female Note: join together pins 4&5 at DB-25 female side (DTE equipment side) V.28 DCE synchronous DB25, male DB25, male SGND 105/106 25 Pin Connector male...
  • Page 63 User Manual TELCOLINK DT - AccessDSL NTU RS232 DTE asynchronous DB9, female DB25, male SGND 9 Pin Connector female RS232 DCE asynchronous DB25, male DB25, male SGND 25 Pin Connector male Version: 2.5 Page 63 of 66...

  • Page 64: Appendices

    User Manual TELCOLINK DT - AccessDSL NTU 12 APPENDICES 12.1 Initialization Errors At system startup, various hardware selftests are performed. If any initialization error occurs, the startup procedure will be aborted and the monitor will display an initialization error code in hexadecimal representation.
  • Page 65 User Manual TELCOLINK DT - AccessDSL NTU Integrated Services Digital Network ISDN International Telecommunication Union ITU-T Loss of Frame Alignment Loss of Frame Alignment xDSL LFA-L Loss of Frame Alignment Subscriber LFA-S Loss of Signal LOS-L Loss of Signal Subscriber side LOS-S Line Termination Line Termination Unit...

  • Page 66: References

    User Manual TELCOLINK DT - AccessDSL NTU 12.3 References 12.3.1 Standards ETSI ETR 152, “Transmission and Multiplexing (TM); High Bit Rate Digital Subscriber Line (xDSL) Transmission System on Metallic Local Lines; xDSL Core Specification and Applications for 2048 kbit/s Based Access Digital Sections” ITU-T G.821, “Error Performance of an International Digital Connection Forming Part of an Integrated Services Digital Network”...

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