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Configuring BayStack DSU/CSU Services

117345-B Rev. 00

4-7

Select a test state or keep the default, NO LOOP. See “Loopback Test Modes,”

later in this chapter, for detailed information about the tests.

See the V.54 Loopback parameter on page A-9

for information.

Selecting a loopback test state disrupts user data transmission through the

DSU/CSU for a period specified by the V.54 Timer parameter.

Configuring the V.54 Loopback Timer

You must set the duration, in seconds, for the loopback testing specified in the

V.54 Loopback parameter. The default value, zero (0), indicates that loopback

testing runs indefinitely.

Specify the number of seconds, from 1 to 255, for loopback testing to run, or keep

the default, 0.

See the V.54 Timer parameter on page A-10

for information.

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.

Caution:

If the only connection with the remote router is through the

DSU/CSU, selecting a loopback test state prevents the local router from

communicating with the remote router for the duration of the test.

Caution:

If the only connection with the remote router is through the

DSU/CSU, be sure to specify a nonzero value, since loopback testing prevents

the local router from communicating with the remote DSU/CSU.

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Avaya Configuring WAN Line Services Manual do Utilizador Página 89