Avaya Configuring WAN Line Services Manuale Utente Pagina 90

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Configuring WAN Line Services
4-8
117345-B Rev. 00
The following sections describe the supported tests:
Digital Loopback (DL)
Digital Loopback mode tests the local DSU/CSU and the Telco circuit. The
DSU/CSU enters Digital Loopback mode when it receives a CCITT V.54 loop-up
code, or when configured in Configuration Manager.
In Digital Loopback mode, the DSU/CSU takes transmit data and converts it to
receive data. The DSU/CSU retimes and reshapes the received data, then transmits
the data back to the network. The remote facility transmits back to the router all
data it receives from the router. Figure 4-5
illustrates the operation of a Digital
Loopback test.
Figure 4-5. Digital Loopback
Section Page
Digital Loopback (DL)
4-8
Remote Digital Loopback (RL) 4-9
Local Analog Loopback (AL) 4-9
Pattern-2047 BERT Test 4-10
Telco-Activated Loopback 4-10
LS0025A
Network
AN/ANH/ARN
DSU
CSU
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