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AM64/128A User Manual

Glossary

37

GLOSSARY OF TERMS

AIS

Alarm Indication Signal.

ALT

Automatic Local Test. - Pattern sent to apply a local loop in the DCE.

AMI

Alternate Mark Inversion. - Code used for line transmission.

ART

Automatic Remote Test. - Pattern sent to apply a loopback on the remote modem.

BBM

Baseband Modem.

BT

Byte Timing. - Synchronisation to every 8 bits.

CNR

Controlled Not Ready

DC

Direct Current

DCE

Data Circuit-terminating Equipment.

DSP

Digital Signal Processor.

DTE

Data Terminating Equipment.

EEPROM

Electrically Eraseable Programmable Read Only Memory.

EMC

Electromagnetic Compatibility.

G.703

ITU-T Recmmendation for physical and electrical characteristics of hierarchical digital
interfaces. used for 64Kbps and E1/T1. Whereby data and its associated timing are
transmitted in the same direction. (120, 4Kbps Codirectional)

ITU-T

International Telecommunications Union - Telecoms.

LCD

Liquid Crystal Display

LED

Light Emitting Diode.

LTU

Line Terminating Unit. Equivalent to Baseband Modem.

PTO

Public Telephone Operator.

RS-530

High speed 25-position interface for DTE and DCE employing serial binary data
interchange; developed to serve as a complement to EIA-232-D for data rates above
20kbps.

SEXT

External Signal Element Timing.

UNR

Uncontrolled Not Ready.

V.10 ITU-T

Electrical Characteristics for unbalanced double current interchange circuits for general
use with integrated circuit equipment in the field of data communications.

V.11

CCITT specification. Electrical characteristics for balanced double-current interchange
circuits for general use with integrated circuit equipment in the field of data
communications.

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Содержание AM128A

Страница 1: ...AM64 128A BASE BAND MODEM USER MANUAL ATL Part No 1 203 002 610 Issue 4 September 2002...

Страница 2: ...28A User Manual 2 THE INFORMATION CONTAINED IN THIS DOCUMENT IS CONFIDENTIAL TO ATL TELECOM LTD AND MAY NOT BE DISCLOSED OR REPRODUCED IN WHOLE OR IN PART WITHOUT THEIR WRITTEN CONSENT ATL TELECOM LTD...

Страница 3: ...ront Panel Features 12 5 2 Front Panel Operation 13 5 3 Status Menu 14 5 3 1 Over all Status 14 5 3 2 Alarm Status 15 5 3 3 User Rate 16 5 3 4 Line Rate 16 5 3 5 Interface Status 16 5 3 6 Mode Display...

Страница 4: ...aster Slave 33 5 7 2 Line Rate 33 5 7 3 X 21 Loop Control 34 5 7 4 Synchronisation Type 34 5 7 5 64k Mode 36 5 7 6 Power Level 36 5 7 7 Menu Lock 36 Glossary of Terms 37 General Specification 39 Appen...

Страница 5: ...onfigured using the front panel keys in conjunction with the Liquid Crystal Display LCD The display is operated in a menu type fashion with easy to understand mnemonics which should make constant refe...

Страница 6: ...specified and 3 pin IEC connector on the other Also included is a double ended FCC connector 6 way 4 loaded RJ11 to BT 631A plug line cord as standard however other optional line cord plugs are availa...

Страница 7: ...control channel for the systems own use Echo cancellation is used to eliminate the unwanted reflections of the transmitted signal from the receiver input The echo canceller can eliminate echoes of up...

Страница 8: ...ts 1 framing bit and 1 status bit At rates below 48kbps the octets are iterated as appropriate to fill the transmission channel The control channel uses 4 bits from each transmission frame to transmit...

Страница 9: ...supply but set to 120V working it will not work There is an auto resetting thermal fuse incorporated into the unit which will trip In order to reset the fuse the BBM should be unplugged and left to s...

Страница 10: ...onfigured The following data is provided by this menu a Overall status i e whether ready or not b Alarm messages c User data rate d Line rate e Interface status f Interface mode To examine this data f...

Страница 11: ...hich determines whether the interface details are to be set either from the line card or modem If the interface is to be set from the line card then the enable switch should be off and the line card o...

Страница 12: ...The LCD display is complemented by the use of 5 LED s to indicate the following 1 FAULT Red LED This is lit to indicate the line signal is faulty the main causes of this are as follows 1 No signal re...

Страница 13: ...lay will automatically time out and revert to the top line of the status menu after 5 mins The sequencing through the menus is as follows STATUS MENU TEST MENU RATE MENU OPTION MENU CONFIG MENU When s...

Страница 14: ...d Data S Receive Data a If a loop is applied within the BBM the display reads S Loop Active b If a fault exists or a not ready signal including AIS is being received from line then the display reads S...

Страница 15: ...is in 64k mode whilst sending binary 1 s If the alignment pattern from the line cannot be locked onto the display reads S No Alignment Possible causes are a Line attenuation noise level too high b Inc...

Страница 16: ...le line rate 142 2kbps is selected then the display is S 128K Rate Note Not available with G 703 Interface 5 3 5 Interface Status This item displays the state of the lines on the DTE interface For X 2...

Страница 17: ...a BBM to BBM link this display should read Link Mode If however a Line Card is used instead of a master BBM then the display should read Network Mode The essential differences of Network mode are tha...

Страница 18: ...loops data back to the DTE from a point as close to the interface connector as possible This loop can be applied in two ways 1 From the Menu 2 Direct from the DTE see section 5 4 1 2 5 4 1 1 Local lo...

Страница 19: ...It is possible to have a BBM Menu selected local loop operational at the same time as a DTE local loop In this case the local loop will only be removed when both the Menu item has been deselected and...

Страница 20: ...ctive To apply the loop select the item T Rem Loop Off Press SELECT and the display should change to T Rem Loop On Note As this feature applies a loop at the remote end it is possible that in some cir...

Страница 21: ...4 Binary Patterns It is possible to transmit three different patterns to the remote BBM 1 All 1 s with status ON 2 All 0 s with status ON 3 Alternate 1 s and 0 s with status OFF Controlled Not Ready...

Страница 22: ...he Test Menu 2 Remote loop selected from the DTE 3 Comms channel loop selected from the Test Menu See section 5 4 9 Loop 3 is usually the most convenient It MUST be applied before entering Data Test m...

Страница 23: ...Test in the test menu 1 Error display The BBM injects a binary 0 pattern immediately the mode is entered The TM LED should light to verify this The display should then be Errors nnnnnn The number of...

Страница 24: ...s the display to Transparent Mode Binary 0 injection is then disabled and the data path is direct to the DTE or data tester Selecting Transparent mode changes the pattern display to show No Injection...

Страница 25: ...tted envelope errors master only 4 Time of test The SELECT and SCROLL keys operate in the same manner as in Data Test This mode may be left running over a long period so an abort indication has been a...

Страница 26: ...nitial power on 2 By user selection in the test menu The power on displays are a shorter version of menu activated Self Test and are as follows 1 Testing 2 Self Test Pass 3 AM64128A V1 0 Self Test is...

Страница 27: ...in the non volatile memory EEPROM has an incorrect checksum This can occur during normal usage if the unit was programming a new configuration when the power was turned off Normal operation can resume...

Страница 28: ...of rates use the SCROLL keys The rates increase scrolling down through the list For example If the rate 4 8k is currently selected then the display is R Rate 4 8K Scrolling down one position gives the...

Страница 29: ...e now two separate rates to display and these are indicated clearly with the words Master or Slave The SELECT key now only defines the slave rate the master rate remains at 64k BT until the 64k mode i...

Страница 30: ...ers This can be explained more clearly by considering the operation of the menu The top level display will show whether the interface type fitted conforms to either X 21 or X 21bis The X 21 mode is sh...

Страница 31: ...data rate 5 6 4 Asynchronous Mode This is only available with X 21bis V 28 interface fitted For data rates of 19 2kbps 9 6kbps 4 8kbps and 2 4kbps there is an option of selecting Synchronous or Async...

Страница 32: ...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...

Страница 33: ...extra facilities included in the master mode These are 1 Selection of the user data rate see section 5 5 2 External bit byte timing synchronisation see section 5 7 4 3 Provision of 64k mode see sectio...

Страница 34: ...ning The normal loops on mode is shown in the menu as C X21 Loops On Pressing SELECT enables loops off shown as C X21 Loops Off 5 7 4 Synchronisation Type for software versions below V1 3 This option...

Страница 35: ...input SEXT and uses this to synchronise the link with its remote Slave unit or Option 3 C Internal Clk This option is shown when the External bit timing OFF is selected The Master unit is the source o...

Страница 36: ...rectly configured The normal mode is displayed C Menu Unlocked When the menu is locked the display changes to C Menu Locked When locked the SELECT key is disabled and no items in any menu can be alter...

Страница 37: ...64Kbps and E1 T1 Whereby data and its associated timing are transmitted in the same direction 120 4Kbps Codirectional ITU T International Telecommunications Union Telecoms LCD Liquid Crystal Display L...

Страница 38: ...108kHz group band circuits V 36 CCITT specification Modems for synchronous data transmission using 60 108kHz group band circuits X 21 CCITT specification Interface between DTE and DCE for synchronous...

Страница 39: ...rates 2400 4800 9600 16000 19200 32000 48000 56000 64000 bit s Double line rate user data rates 128000 bit s Synchronous working at all user rates asynchronous working at 2400 4800 9600 and 19200 bit...

Страница 40: ...hannel Received Line Signal Detector Transmitter Signal Element Timing DCE Receiver Signal Element Timing DCE Remote Loopback for Point to Point circuits Local Loopback Test Indicator External Transmi...

Страница 41: ...ata Received Data Request to Send Ready for Sending Data Set Ready Data Channel Received External Transmitter Signal Element Timing Transmitter Signal Element Timing Receiver Signal Element Timing Rem...

Страница 42: ...s standard The line connections are the middle two pins 2 3 blue and green wires in the RJ11 6 way 4 loaded connector Note Alternative Line cord connectors are available upon request Pin Unbal 1 7 22...

Страница 43: ...Appendix B Internal Link Settings AM64 128A User Manual A 4 APPENDIX B Internal Link Settings...

Страница 44: ...1 This connects the supply earth to the circuit ground in position 1 3 The circuit ground is floating in position 1 2 WARNING Only authorised personnel can be allowed to open the Line Terminat ing Uni...

Страница 45: ...n signal rise times and minimises reflections at rates greater than 9 6 kbps over long lines At lower rates and over short lines the termination resistor may be omitted link set position 1 2 V 35 Inte...

Страница 46: ...nnects a 120 ohm resistor across the 113 circuit in position 1 3 This helps maintain signal rise times and minimises reflections at rates greater than 9 6 kbps over long lines At lower rates and over...

Страница 47: ...as one bit is used as the user status line and the other bit is used as an envelope alignment bit this bit is used by the system for the multiplexing of lower user rates into the 71 1 142 2 kbps over...

Страница 48: ...r Rate BER _____________________ User Data Rate x Time There is a complication with the comms framing word The word is originally transmitted from the master BBM when it gets to the slave it is monito...

Страница 49: ...erface Port has a safety status of Un Earthed SELV The V36 Network Interface Port has a safety status of Earthed SELV The RS530 Network Interface Port has a safety status of Earthed SELV The G 703 Dig...

Страница 50: ...ata across the link but there is no byte alignment between the ends The byte timing mode ensures alignment of every octet of data The bit timing mode is available for every interface type and user rat...

Страница 51: ...GND CCITT circuit R A R B T A T B SEXT A SEXT B C A C B I A I B GND Timing Source DCE 2 9 4 11 14 7 5 12 3 10 8 Timing Sink DTE 4 11 2 9 1 15 3 10 5 12 8 CCITT circuit 103 104 105 102 109 115 CCITT ci...

Страница 52: ...t the receiver end of the link dependant upon the implementation of the interface control lines balanced or unbalanced CCITT circuit 103 A 103 B 104 A 104 B 105 A 105 B 109 A 109 B 115 A 115 B 102 A 1...

Страница 53: ...setting the 105 interface line to the ON state pin 4 set 3V option or II Go to the Option Menu and scroll down and select 105 set on If using any of the interfaces X 21 bis V 24 V28 V 35 V36 or RS530...

Страница 54: ...ollows for a pair of BBMs Using the front panel push buttons and LCD display set one unit as follows In the Configuration Menu of the first unit Config Menu set C Slave Mode C 64K Rate C X21 Loops On...

Страница 55: ...AM64 128A User Manual...

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