American Telecom AM64/128A manual 3 G.703, Asynchronous Mode, Signalling Rate

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AM64/128A User Manual	Menu Operation - Option Menu

(3)

O > 107 Normal

Press SELECT:

O > 107=108/1

This allows control line 107 to follow control line 108/1 independent of other factors.

(4)

O > 108/1 Normal

Press SELECT

O > 108/1 Set On

This option holds the control line 108/1 ON internally.

There are three options for the X.21bis V.35, V.36 and RS-530 interface. (1) and (2) as before and :

(3)	O > 107 Normal	Press SELECT

This holds control line 107 ON permanently.

O > 107 Set On

There is no control line 108/1 directly associated with V.35/V.36, so it is held ON internally. This means that although it is not displayed, the option 108/1 Set On is active with V.35 or V.36 interfaces fitted.

5.6.3 G.703

This is only available with a G.703 interface fitted. This only operates at 64kbps 120ž codirectional 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 Asynchronous working. If one of these rates has been selected, then further menu items will become available.

Following the control line setting options, the display will scroll to:

Pressing SELECT changes the display to:	O > Async Mode

O > Sync Mode

Async Mode then gives the user further options for setting the signalling rate, and character length.

5.6.5 Signalling Rate

The signalling rate defaults to :

O > Normal Rate

This is termed the basic signalling rate, and in normal use this is sufficient. This rate allows the asynchronous bit rate to have a tolerance of between -2.5% and +1%. In order to increase the tolerance range under which the BBM will

operate correctly, press SELECT, giving:

O > Extended Rate

The tolerance range will then be increased to allow the BBM to operate between, -2.5% to +2.3%.

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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 Self Test Pass InstallationTesting BBM to BBM LinkLink 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 CD Fail Alarm StatusNo Alarm No Signal Receiving AIS No Alignment LOS/CD FailLine Rate User RateInterface Status Link Mode Network Mode Operating ModeLoc Loop On Test MenuLocal loop Local loop from menu Top level display shows Loc Loop OffLoopback On LoopbackLocal loop from DTE Loopback is applied by selecting the display Loopback OffRem Loop On Remote LoopRemote Loop from menu Rem Loop OffRemote loop from DTE Binary PatternsBin Keys Off Sending Bin Operation Error Count Bit Error Rate BER = User Data Rate x TimeData Test OverviewData Test Errors nnnnnnErrors s000001 ErrorsInjecting 1s Injection ModeTransparent Mode Injecting 0sTime If the count is stopped the display is Stop Service TestSvc Test Comms Evp Rx Evp TxSelf 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 Internal Clk Synchronisation Type for software version V1.3 and aboveExt Byte Clk Ext Bit 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 Rate 64K Slave Mode 64K RatePower 10dBm Master Mode C 64K Rate