DataComm V.34 PL Operation Manual
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Tests Remote Digital Loopback060R115-000 DataComm V.34 PL Modem 4-5Issue 1 Installation and OperationRemote Digital LoopbackRemote Digital Loopback, illustrated below, is controlled at the local end. It can be commandedfrom the front panel, or by the DTE's EIA pin 21. The loopback can be commanded only after a callis established and both ends are in data mode. In this loop, the demodulator's descrambled receiveddata at the remote end is coupled to the remote transmitter input for transmission back to the localend.Table 4-4 Remote Digital LoopbackStep Front Panel1. Establish data communications with aremote modem.2. Check with the remote attendant that theremote modem will accept Remote DigitalLoopback commands.3. To start the test, press RDL.4. The modem flashes the TM LED anddisplays the test name (RL) while it is set-ting up the test, then lights the TM LEDand decimal point two while the test isrunning. (If the remote modem initiated thetest, the local modem lights decimal pointsthree and four while the test is running.)ModemtransmitterDTECommunicationsline DTELOCAL MODEM REMOTE MODEMModemreceiverModemreceiverModemtransmitterFor the remote loopback test, the remote DTE orterminal is disconnected.SenddataReceiveddataRemote loopbackV.34 PL TR SD RD MR RS CS CO GD TM ALM OHAL ST RDL DL SEL RSTADV1. Establish data communications with the remote modem.2. Check with the remote attendant that the remote modem will acceptRemote Digital Loopback commands.3. To start the test, press RDL.4. TM flashes and the LCD displays the test name (RL) while it is setting up the test,then TM lights, and decimal point two appears on the LCD while the test is running.5. Enter data at the local DTE. Compare data that was entered at the DTE with the datathat is looped back and displayed by the DTE.6. To end the test, press AL, RDL or DL.V.34 PL TR SD RD MR RS CS CO GD TM ALM OHAL ST RDL DL SEL RSTADVLOCALREMOTE |
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