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AM64/128A BASE BAND MODEM USER MANUAL A TL Part No. 1/203/002/610 Issue 4 - September 2002..
AM64/128A User Manual 2 THE INFORMA TION CONT AINED IN THIS DOCUMENT IS CONFIDENTIAL TO A TL TELECOM L TD. AND MA Y NOT BE DISCLOSED OR REPRODUCED IN WHOLE OR IN P AR T WITHOUT THEIR WRITTEN CONSENT .
Contents AM64/128A User Manual 3 CONTENTS 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2. Constructional Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AM64/128A User Manual Contents 4 5.6 Option Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 5.6.1 X.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 5.6.2 X.21bis .
Introduction AM64/128A User Manual 5 1. INTRODUCTION This manual applies to the AM 64/128A Baseband Modem. This modem is manufactured in the U.K. by A TL T elecom Ltd. There ar e six variants, each with a differ ent physical data interface circuit. The A TL T elecom Ltd.
Constructional Details AM64/128A User Manual 6 2. CONSTRUCTIONAL DET AILS 2.1 Baseband Modems The BBM is housed in a black plastic case. On the front panel ther e is a menu driven LCD display with six keys and five LED's.
System Overview AM64/128A User Manual 7 3. SYSTEM OVER VIEW The AM64/128A baseband modem uses the digital transmission system designed and developed by A TL T elecom Ltd. in Cardif f. It is intended for operation on 2-wire local telephone network cir cuits, such as those meeting BT EPS-9 (2-Wire).
AM64/128A User Manual System Overview 8 The interface circuit performs a number of functions : it converts between the user data fr om the appropriate interface and the 64kbps or 128kbps, which is tra.
Installation AM64/128A User Manual 9 4. INST ALLA TION This chapter describes the basic steps that are r equir ed to set up a system involving the Baseband Modems (BBM's).
AM64/128A User Manual Installation 10 Set the line rate (section 5.7.2) as requir ed at both ends, and set the user data rate up on the master (section 5.5). When the line is connected the F AUL T LED should go out. The interface details and synchronous or asynchr onous working should now be configured at both ends.
Installation AM64/128A User Manual 11 4.2 BBM to Line Car d Link Power up the BBM as described previously , and set the modem to slave mode. Set the line rate as requir ed, and connect the line cord. Consult the line card handbook to set up the user data rate.
Menu Operation AM64/128A User Manual 12 5. MENU OPERA TION 5.1 Front Panel Featur es The Baseband Modem has an uncluttered and easy to understand fr ont panel.
AM64/128A User Manual Fr ont Panel Operation 13 5.2 Fr ont Panel Operation The LCD will display one of five menus at any one time, these menus are: 1. ST A TUS (Prompt is S>) 2. TEST (Prompt is T>) 3. RA TE (Prompt is R>) 4. OPTION (Prompt is O>) 5.
Status Menu AM64/128A User Manual 14 5.3 Status Menu The status menu is read only , which means the select button has no effect. It pr ovides the following data: (1) Overall status (2) Alarm messages (3) User data rate (4) Line rate (5) Interface status (6) Operating mode 5.
AM64/128A User Manual Alarm Status 15 5.3.2 Alarm Status The possible messages for this item are: S > No Alarm S > No Signal S > Receiving AIS S > No Alignment The S > No Signal display indicates that the transmission system cannot find a signal to lock on to.
Status Menu AM64/128A User Manual 16 5.3.3 User Rate This item displays the user rate in current use. A complete list is given in section 5.5 - Rate Menu. For example: S > 48K 10 5.3.4 Line Rate This has to be set locally to the BBM via the front panel and cannot be downloaded fr om the Master unit.
AM64/128A User Manual Menu Operation - Status Menu 17 5.3.6 Operating Mode The BBM is capable of operating in two basic modes: S > Link Mode S > Network Mode For a BBM to BBM link this display should read Link Mode. If however a Line Car d is used instead of a master BBM, then the display should read Network Mode.
Menu Operation - T est Menu AM64/128A User Manual 18 5.4 T est Menu 1. Local loop 2. Loop back 3. Remote loop 4. Binary pattern 5. Data error test 6. In service error test 7. Lamp test 8. Self T est 9. Comms channel loop 5.4.1 Local loop This is a loop applied within the local BBM.
AM64/128A User Manual T est Menu 19 With a G.703 Interface fitted, the application of a local loop will cause G.703 data to be looped back to the G.703 network at the G.703 interface (known as a Loop B / LCB loop on the G.703 linecard and standalone units) as shown in figure 5.
T est Menu AM64/128A User Manual 20 With a G.703 interface fitted, the application of a loopback will apply a loopback to line at the remote slave unit (known as an L TU loop on the G.703 linecard and standalone units). Note : It is not possible to “Hardwir e” a G.
AM64/128A User Manual T est Menu 21 5.4.3.2 Remote loop from DTE When the BBM receives an ART pattern (00110011) from the DTE (in X.21), or when cir cuit 140 is active (in X.21bis) the loopback is applied on the remote BBM similarly to the above. T o apply a remote loop in this fashion refer to your DTE handbook for details.
T est Menu AM64/128A User Manual 22 5.4.5 Data T est 5.4.5.1 Overview This mode allows the user to send a binary 0's pattern to the remote BBM and monitor the received data stream for err ors Note : every binary 1 received is tr eated as a single error .
AM64/128A User Manual T est Menu 23 The Data T est can be used to test the performance of a link (0 or 1 patterns on the two wire line are all AMI encoded and framed as described in section 3). Note: Apply any loops requir ed before entering Data T est Mode.
T est Menu AM64/128A User Manual 24 2/ Pattern display The pattern display usually shows Injecting 0s Pressing SELECT will cause binary 1s to be injected (e.g. for loop verification): Injecting 1s This pattern will continue to be injected until the SELECT key is pressed again, (or the mode is exited).
AM64/128A User Manual T est Menu 25 5.4.6 In Service T est 5.4.6.1 Overview This mode allows the error performance of the line to be monitor ed, without interrupting data traffic. This works by monitoring the accuracy of some of the overhead bits that make up the transmission frame structure.
T est Menu AM64/128A User Manual 26 5.4.7 Lamp T est This facility is used to check the LED’ s and the LCD display . T o activate the test choose the item T > Lamp T est Pressing SELECT will cause a complete line of blocks to show on the LCD. Simultaneously all the LED's should light up, for about 3 seconds.
AM64/128A User Manual T est Menu 27 However , the usage of the EEPROM (Blocks Used) is still displayed for information. For example: 000 means that the first block is in use and that there ar e 254 empty blocks. 254 means that the last block is being used and the chip is nearly full.
Menu Operation - Rate Menu AM64/128A User Manual 28 5.5 Rate Menu The rate menu is only accessible in master mode. In slave mode the user rate is dictated by the master BBM.
AM64/128A User Manual Rate Menu 29 The Rate menu operates slightly differ ent when 64k mode is activated. It is described more fully in the Configuration Menu (Section 5.7). Briefly , this mode involves the master BBM set to 64K + BT , and the slave BBM set to some other rate.
Menu Operation - Option Menu AM64/128A User Manual 30 5.6 Option Menu This menu displays the type of DTE interface currently fitted in the BBM. The AM64/128A automatically “reads” which interface type is fitted on power up, and pr ograms certain options accor dingly .
AM64/128A User Manual Menu Operation - Option Menu 31 (3) O > 107 Normal Press SELECT : O > 107=108/1 This allows control line 107 to follow contr ol line 108/1 independent of other factors. (4) O > 108/1 Normal Pr ess SELECT O > 108/1 Set On This option holds the control line 108/1 ON internally .
Menu Operation - Option Menu AM64/128A User Manual 32 5.6.6 Character Length Scrolling down further gives the display: O > Char Len: 8 Pressing SELECT changes the length between the four options, 8, 9, 10 and 11 bits. The character length sets the total character length including one start bit, one stop bit and possible parity bit.
AM64/128A User Manual Menu Operation - Configuration Menu 33 5.7 Configuration Menu This menu contains the items that are used in the initial configuration of the BBM.
Configuration Menu AM64/128A User Manual 34 5.7.3 X.21 Loop Control This facility is designed for when a pair of BBM’ s are used as an extension to another BBM link. The concept is shown below . Figure 5.7.3 BBM’ s A and B form part of a conventional link.
AM64/128A User Manual Configuration Menu 35 5.7.4.1 Synchronisation T ype (for software version V1.3 and above) With these later versions of software, there ar e three possible options depending upon which interface is fitted, whether Master or Slave mode is selected, and the rate selected.
Configuration Menu AM64/128A User Manual 36 5.7.5 64k Mode This mode is designed to be used in association with the X.50 framing patterns. When the mode is selected the master BBM is set to 64k and the slave is (usually) set to 48k X.50. This allows the master BBM to become transparent to the X.
AM64/128A User Manual Glossary 37 GLOSSAR Y OF TERMS AIS Alarm Indication Signal. AL T Automatic Local T est. - Patter n sent to apply a local loop in the DCE. AMI Alternate Mark Inversion. - Code used for line transmission. ART Automatic Remote T est.
Glossary AM64/128A User Manual 38 V .24 CCITT specification. List of definitions for inter change circuits between DTE and DCE. V .28 CCITT specification. Electrical characteristics for unbalanced double-curr ent interchange circuits. (V .28 Interchange cir cuits defined in V .
AM64/128A User Manual Specifications 39 GENERAL SPECIFICA TIONS T ransmission system uses DSP techniques involving echo cancellation and adaptive decision feedback equalisation. The system is intended for use on 2-wire unconditioned copper wir e (BT EPS-9 type circuits).
AM64/128A User Manual Appendix A - Interface Connections A-1 APPENDIX A - Interface Pin Connections 25 W ay D - type X.21 bis (V .24 / V .28*) Connector pin allocation *V .28 defines the electrical characteristics of the circuits of a V .24 interface.
Appendix A - Interface Connections AM64/128A User Manual A-2 V .35 (MRAC) Connector Pin allocation Note: Circuit 108/1 is not available on the connector as an interface line but is softwar e clamped in the ON state.
AM64/128A User Manual Appendix A - Interface Connections A-3 25 W ay D-type RS-530 Connector pin allocation *Standards dictate that the contr ol circuit 107 may be implemented as a balanced cir cuit (using both A and B wires) or as an unbalanced single ended cir cuit.
Appendix B – Internal Link Settings AM64/128A User Manual A-4 APPENDIX B – Inter nal Link Settings.
AM64/128A User Manual A-5 The function of the links is as follows: J1 T ransmission disable This link is always left in position 1-2 J11 W atch dog enable This link is always left in position 1-2 J21 .
AM64/128A User Manual Appendix B – Internal Link Settings A-6 Interface Modules X.21 Interface Module: J1 - X.21 T (T ransmit data) Circuit T ermination – This link connects a 120 ohm load resistor acr oss the T circuit position 1-3. This helps maintain signal rise times and minimises r eflections at rates greater than 9.
AM 64/128A User Manual Appendix B – Internal Link Settings A-7 Interface Modules: RS530 Interface Module: J1 – V36 and RS530 Circuit 103 (T ransmit data) Circuit T ermination – This link connects a 120 ohm load resistor acr oss the 103 cir cuit in position 1-3.
Appendix C - In Service T est AM64/128A User Manual A-8 APPENDIX C - In Service T est BACKGROUND INFORMA TION The information passing between master and slave BBM’ s comprises of user data and control data; the latter is used for controlling and supervising the operation of the transmission system.
AM64/128A User Manual Appendix C - In Service T est A-9 It must be remember ed that this err or count is unidir ectional only . There can be no looping of the envelope alignment bits. This fact can be used to advantage in determining the location of noise on a link.
Appendix D - Approvals AM64/128A User Manual A-10 APPENDIX D - Appr ovals L VD - Safety Statements: Power Rating Information - AC Source: 1. V oltage Range: 230/120V ac. 2. Current Range 40mA at 230V and 85mA at 120V . 3. Frequency Range 50/60Hz. Safety Instructions: 1.
Appendix E - Private digital circuits AM64/128A User Manual A-12 APPENDIX E Use on X.21/X.21bis digital circuits - External Timing Configuration The details in this appendix relate to the arrangement shown in figur e E.
AM64/128A User Manual Appendix E - Private digital circuits A-13 2. X.21 byte timing cable - (15 way to 15 way D type plugs). 3. V .24 / V .28 bit timing cable - (25 way to 25 way D type plugs). 4. V .35 bit timing cable - (34 way to 34 way MRAC plugs).
Appendix E - Private digital circuits AM64/128A User Manual A-14 5. X.21 bis V .36 bit timing cable - (37 way to 37 way D type plugs). * In some cases it may be necessary to connect this line to GND (102) at the receiver end of the link dependant upon the implementation of the interface control lines - balanced or unbalanced.
AM64/128A User Manual Appendix F - T roubleshooting A-15 Appendix F - T r oubleshooting Please check the following points if problems ar e encountered when setting up a BBM link. 1. Ensure the modem is being used on unconditioned copper twisted pair wir e.
Appendix F - T roubleshooting AM64/128A User Manual A-16 In some environments, the external timing input (SEXT on X.21 or circuits 113 on the X.21 bis interfaces) of an AM64/128A set in Master Mode may become sensitive to external coupled noise.
AM64/128A User Manual.
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