DataComm V.34 PL Operation Manual
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Tests Digital Loopback4-4 DataComm V.34 PL Modem 060R115-000Installation and Operation Issue 1Digital LoopbackThe modem can be commanded to enter digital loopback, illustrated below, by means of the frontpanel. This loopback is used while a call to the distant modem is established. In digital loopback,the local received data is coupled to the transmitter input, so that the remote unit can perform aloopback test without commanding remote loopback. In asynchronous mode the clocks are clampedat the EIA interface.Table 4-3 Digital LoopbackStep Front Panel1. Establish data communications with aremote modem.2. To start the test, press DL.3. The modem flashes the TM LED anddisplays the test name (DL) while it is set-ting up the test, then lights the TM LED anddecimal point one while the test is running.4. Direct the remote attendant to enter data atthe remote DTE, then compare it with thedata that is looped back and displayed bythe DTE. If errors occur frequently, aproblem may exist in the local or remotemodems, the remote DTE, the remoteDTE-to-modem connection, or thecommunication line. Refer to Figure 4-1,Fault Isolation Sequence.5. To end the test, press AL, RDL or DL.ModemtransmitterDTEDigital loopbackModemreceiver Communications lineV.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. To start the test. press DL.3. TM flashes and the LCD displays the test name (DL) while it is setting up the test, thenTM lights and decimal point one is displayed while the test is running.4. Ask the remote attendant to enter data at the remote DTE, thencompare it with the data that is looped back and displayed by the DTE.5. To end the test, press DL. |
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