American Telecom AM64/128A manual Configuration Menu, Master Slave, Line Rate

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AM64/128A User Manual	Menu Operation - Configuration Menu

5.7Configuration Menu

This menu contains the items that are used in the initial configuration of the BBM. Once set up they are usually left unchanged for normal BBM operation. All of the configuration parameters are stored in non- volatile memory and are restored each time the BBM is powered up.

The items in this menu are as follows:

(1)Master - Slave

(2)Line rate

(3)

X.21 loop control

(Not available for certain interfaces)

(4)Synchronisation type

(5)64k mode

(6)Transmit power level

(7)Menu lock

5.7.1Master - Slave

When two BBM’s are connected together to form a link, one must always be a master while the other has to be set as a slave. The transmission signal is different for master and slave, so line synchronisation will never be achieved if two like types (e.g. Master-Master) are connected together. Normally it makes no difference which BBM is which, but there are a few 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 section 5.7.5).

(4)Extra error monitoring facilities, (see section 5.4.6).

The default setting is to slave mode :

C > Slave Mode

Pressing SELECT gives :

5.7.2 Line Rate

C > Master Mode

The line rate is the basic bit rate of the transmission between the two BBM ‘s. This must be set locally to the BBM via the front panel in both Master and Slave BBM’s and cannot be downloaded from the Master unit. There are two settings High Rate and Double Rate. The high rate gives a better range, but lower user data rates.

The high rate is shown as:	C > 64K Rate

Pressing SELECT gives the double rate, shown as:

C > 128K Rate

High rate is 71.1 kbps, and all user data rates (except 128k) are allowed. The maximum operating distance depends upon the cable dimensions, an example is 5km when used with 0.4mm cable, (corresponding to 50dB attenuation).

Double rate is 142.2 kbps, and only user data rate 128 kbps is allowed. The distance on 0.4mm cable is to 4km, (40dB attenuation).

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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 IntroductionConstructional Details Baseband ModemsInterface 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 OffStatus Menu Over all StatusLoop Active No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD FailUser Rate Line 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 OnBinary Patterns Remote loop from DTEBin 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 MenuAsynchronous Mode Signalling Rate3 G.703 Char Len Character LengthConfiguration Menu Master SlaveLine Rate 3 X.21 Loop Control ModemSynchronisation Type for software versions below Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal Clk5 64k Mode Power LevelMenu Lock Glossary of Terms Band circuits General Specifications Way D type X.21 bis V.24 / V.28* Connector pin allocation Way D-type X.21 V.11 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 E21 byte timing cable 15 way to 15 way D type plugs 24 / V.28 bit timing cable 25 way to 25 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