ADTRAN NxT1 HSSI/V.35 user manual LA and LB

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Chapter 3. Operation

Remote Line Loopback

Local Line Loopback

Local DTE Loopback

NxT1 HSSI

T1 Interfaces	IMUX	DTE

Figure 3-4. HSSI Interface Loopback Test Diagram

LA AND LB

(Not applicable in V.35 mode.)

Displays the status of the loopback circuit A and B signals. LA and LB are asserted by the DTE to enable a loopback on the DCE and its associated data communications channel. Four possible loop- back options are available:

LA	LB	Loopback


Off	Off	No Loopback Active

On	On	Local DTE Loopback is Active

On	Off	Local Line Loopback is Active

Off	On	Remote Line Loopback is Active

TA

Displays the status of the data Terminal equipment Available signal. TA will be asserted by the DTE (independently of CA) when the DTE is prepared to both send and receive data to and from the DCE. Valid data transmission should not commence until CA has also been asserted by the DCE. If the data communications channel requires a keep alive data pattern when the DTE is disconnected, then the DCE shall supply this pattern while TA is deasserted.

When using the NxT1 HSSI Module (1200346L2 only) in V.35 mode, TA displays the status of the Request to Send (RTS) signal. When RTS is active in a V.35 configuration, Clear to Send (CTS) is also active.

61200771L1-1

NxT1 HSSI/V.35 Module User Manual

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Contents NxT1 HSSI/V.35 Module Page Save These Important Safety Instructions Affidavit Requirements for Connection to Digital Services Page Page SOC REN FIC Usoc Page Page Limited Product Warranty Customer Service, Product Support Information, and Training Post-Sale Support Table of Contents Appendix a Dedicated Maps Configuration List of Tables List of Tables Figure A-1 Dedicated Maps Menu List of FiguresList of Figures NXT1 HSSI/V.35 Module Overview IntroductionNXT1 HSSI/V.35 Module Specifications FeaturesFunctional Description Line or payload loopback Local and Remote NxT1 HSSI/V.35 Option Module Physical DescriptionBefore Installing the NXT1 HSSI/V.35 Module InstallationInstalling the NXT1 HSSI/V.35 Module Usoc RJ-48C WiringFailed Self-Test Operation Alarms Power UP and InitializationOverview OperationTerminal Menu Structure Modules Write security 3 Read security Read securityModules/Menu on Nor has a module been manually enabled for this option slot Sembly revision Displays the assembly revisionDisplays the part number of the module Displays the serial number of the moduleAccess this menu item Write security 2 Read security Option Module Write security 4 Read securityFunctionality between the DTE and the T1 interfaces Read Security 5 Write SecurityLA and LB RX Rate and TX Rate Restore Atlas Features Used with NXT1 HSSI/V.35 Module OptionsOperation Write security3 Read security5 Appendix a Dedicated Maps ConfigurationCREATE/EDIT Maps Write security3 Read security5 Read security5Security level 3 Read security Write security3 Read securityMenus NXT1 HssiT1 Trouble Code Service Appendix A. Dedicated Maps Configuration Index Index Index-48