Avaya Configuring WAN Line Services Manuel d'utilisateur Page 81

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Configuring BayStack DSU/CSU Services
117021-A Rev. A 4-7
Loopback Test Modes
You can activate DSU/CSU tests from the Configuration Manager, as described in
the previous section, “Configuring V.54 Loopback Tests.” The DSU/CSU module
also responds to CCITT V.54 loop-up and loop-down codes.
The following subsections describe the supported tests:
Digital Loopback (DL)
Remote Digital Loopback (RL)
Local Analog Loopback (AL)
Pattern-2047 BERT Test
Telco-Activated Loopback
Digital Loopback (DL)
Digital Loopback mode tests the local DSU/CSU and the Telco circuit. The
DSU/CSU enters Digital Loopback when it receives a CCITT V.54 loop-up code,
or when configured in Configuration Manager.
In Digital Loopback mode, the DSU/CSU loops transmit data to receive data by
retiming and reshaping data it receives from the network, and transmitting that
data back to the network. The remote facility transmits back to the router all data
it receives from it. F
igure 4-5 illustrates the operation of a Digital Loopback test.
Figure 4-5. Digital Loopback
LS0025A
Network
AN/ANH/ARN
DSU
CSU
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