
Configuring BayStack DSU/CSU Services
117345-B Rev. 00
4-9
Remote Digital Loopback (RL)
Remote Digital Loopback (CCITT V.54 Loopback) tests the local DSU/CSU, the
Telco circuit, and the remote DSU/CSU. The local DSU/CSU sends a V.54
loop-up code to the remote DSU/CSU to initiate a digital loop, and then sends a
test pattern through the loop to check for returned data errors.When the remote
DSU/CSU receives the V.54 loop-up code, it provides the loopback path shown in
Figure 4-6
.
Figure 4-6. Remote Digital Loopback (CCITT V.54 Loopback)
Local Analog Loopback (AL)
Local Analog Loopback is a self-diagnostic local test (Figure 4-7
).
Figure 4-7. Local Analog Loopback
During the local loop test, the CSU transmits data to the network to avoid causing
a carrier alarm.
Network
AN/ANH/ARN
DSU
CSU
LS0024A
Network
AN/ANH/ARN
DSU
CSU
LS0023A
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