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6.2 Remote Digital Loopback Testing
The Remote Digital Loopback (RDL) test checks the performance of both the
local and remote MicroCSU/DSUs, and the communication link between them.
Any characters sent to the remote MicroCSU/DSU in this test mode will be
returned back to the originating device. For example, characters typed on the
keyboard of the local terminal will appear on the local terminal screen after having
been passed to the remote MicroCSU/DSU and looped back. To perform an RDL
test, follow these steps:
1) Activate RDL. This may be done in two ways: by moving the front-panel toggle
switch to "Remote" or by raising the RL signal on the terminal interface.
2) Perform a BER (bit error rate) test on the system.
3) If the BER test equipment indicates a fault and the Local Analog Loopback
test was successful for both MicroCSU/DSU modems, you may have a problem
with the line between the CSU/DSUs. You should inspect the line for proper
connections.
CHAPTER 6: DDS Testing
DIGITAL
NETWORK
CSU/DSU
39
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