22
Remote Digital Loopback (RDL)
The Remote Digital Loopback (RDL) test checks the performance of both
the local and remote Model 1082s, and the communication link between
them. Any characters sent to the remote Model 1082 in this test mode
will be returned back to the originating device (see Figure 12). For exam-
ple, characters typed on the keyboard of the local terminal will appear on
the local terminal screen after having been passed to the remote Model
1082 and looped back.
Figure 12. Remote Digital Loopback
To perform an RDL test, follow these steps:
1. Activate RDL by moving the front panel toggle switch down to
Remote.
Note
Remote loopback cannot be activated until approximately 45
seconds after the two modems have linked to each other.
2. Perform a V.52 BER test as described in “Using the V.52 (BER) test
pattern generator” on page 23. If the BER test equipment indicates
a fault, and the Local Line Loopback test was successful for both
Model 1082s, you may have a problem with the twisted pair line
between the modems. You should then check the twisted pair line for
proper connections and continuity.
Important
Do not send a 511 test pattern from the test equipment
when you connect external test equipment to the 1082.
RDL initiated
Remote 1082
Local 1082
