American Telecom AM64/128A manual Glossary of Terms

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AM64/128A User ManualGlossary

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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Contents Base Band Modem ATL Part No /203/002/610 Issue 4 SeptemberInformation Contained This Document is Confidential to Contents Appendix B International Models IntroductionBaseband Modems Constructional DetailsInterface Modules System Overview System Overview Testing InstallationBBM to BBM Link Self Test PassLink Mode LTU Ready No Alarm LTU Not ReadyBBM to Line Card Link Network ModeMenu Operation Front Panel FeaturesLoop back On Loop back OffOver all Status Status MenuLoop Active No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD FailLine Rate User RateInterface Status Link Mode Network Mode Operating ModeLocal loop Test MenuLocal loop from menu Top level display shows Loc Loop Off Loc Loop OnLocal loop from DTE LoopbackLoopback is applied by selecting the display Loopback Off Loopback OnRemote Loop from menu Remote LoopRem Loop Off Rem Loop OnRemote loop from DTE Binary PatternsBin Keys Off Sending Bin Data Test Error Count Bit Error Rate BER = User Data Rate x TimeOverview OperationErrors s000001 Errors nnnnnnErrors Data TestTransparent Mode Injection ModeInjecting 0s Injecting 1sSvc Test Service TestComms Evp Rx Evp Tx Time If the count is stopped the display is StopSelf Test Lamp TestComm Loop Off Communication Channel LoopbackRate 4.8K Rate MenuMaster 64K BT Slave 4.8K 2 X.21bis Option MenuSignalling Rate Asynchronous Mode3 G.703 Char Len Character LengthMaster Slave Configuration MenuLine Rate Modem 3 X.21 Loop ControlSynchronisation Type for software versions below Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal ClkPower Level 5 64k ModeMenu Lock Glossary of Terms Band circuits General Specifications Way D-type X.21 V.11 Connector pin allocation Way D type X.21 bis V.24 / V.28* Connector pin allocationAppendix a Interface Pin Connections Way D-type V.36 Connector pin allocation Mrac Connector Pin allocationLine Connector Way D-type RS-530 Connector pin allocationAppendix B Internal Link Settings Page Interface Module Interface Modules21bis Interface Module RS530 Interface ModuleFrame Structure Service Test FacilitiesAppendix C In Service Test TTE Network and Safety statements LVD Safety Statements21 bit timing cable 15 way to 15 way D type plugs Appendix E24 / V.28 bit timing cable 25 way to 25 way D type plugs 21 byte timing cable 15 way to 15 way D type plugs35 bit timing cable 34 way to 34 way Mrac plugs RS530 bit timing cable 25 way to 25 way D type plugs 21 bis V.36 bit timing cable 37 way to 37 way D type plugsAppendix F Troubleshooting Power 10dBm Slave Mode 64K RateMaster Mode C 64K Rate Rate 64K