Modem 34336

7.8 Remote Modem Diagnostics

The Modem performs two tests on compatible remote modems: remote digital loopback (RDL) and remote digital loopback self test (RDLST).

If a problem is encountered and the local Modem passes all diagnostic tests, the local Modem can test the remote modem.

Two (noncontiguous) REMOTE TEST screens are on the Modem’s LCD. The remote tests are initiated from the REMOTE TEST menu. (Select RMT from MAIN MENU screen 2. Select TEST. Then, select the test type.) A remote test cannot be initiated unless the Remote Test option is enabled on the remote modem. This option (also REMOTE TEST on the LCD) is accessed via SETUP screen 4.

7.8.1REMOTE DIGITAL LOOPBACK (RDL) TEST

The RDL test (Figure 7-6) allows testing of the local modem, remote modem and telephone line from the local site.

In Hayes mode only, initiate the RDL test using the command &T6 (preceded by AT). In any mode, initiate the RDL test from the Modem’s front panel. Both modems should be on-line and should be tested at the DTE’s data rate. Ensure that the DTR circuit is on. If TR is present on the EIA status screen, the DTR circuit is on.

RECEIVER

TRANSMITTER

 

LOCAL

 

MODEM

 

TRANSMITTER

 

RECEIVER

DATA TERMINAL EQUIPMENT

 

(DTE) AT LOCAL SITE

REMOTE MODEM

Figure 7-6. Remote Digital Loopback Test (RDL).

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Black Box 34336, MD885AE-R2, MD885C-R2, MD885A-R3 user manual Remote Modem Diagnostics, Remote Digital Loopback Test RDL

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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