Avaya Configuring WAN Line Services Bedienungsanleitung Seite 143

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Configuring MCE1 and MCT1 Services
117345-B Rev. 00
7-31
Enabling or Disabling Fractional T1 Loopback Detection
QMCT1 and QMCT1 w/ DS0A link modules only can detect and generate
fractional T1 (FT1) loopback codes as specified in ANSI T1.403 Annex B.
FT1 loopback (channel loopback) is an ANSI-standard 127-octet loop. FT1
loopback detection allows remote test equipment to put one channel (logical line
or DS0 group) on any port into loopback testing mode without affecting the other
logical lines.
Disable or reenable fractional loopback detection on QMCT1 DS0s.
See the Accept Fractional Loopback Code parameter on page A-41
for
information.
See “Running Logical Line Tests” later in this chapter for information about
generating fractional loopback codes.
Configuring NRZI Line Encoding
On DMCT1 net modules and QMCT1 or QMCT1 w/ DS0A link modules only,
you can configure the NRZI Enable and NRZI type parameters. If applicable, see
“Configuring a DS0A Connection” earlier in this chapter. Table 7-2
on page 7-20
provides a matrix of supported configurations for the QMCT1 w/ DS0A logical
line-encoding parameters.
When enabled, the NRZI Enable parameter specifies nonreturn to zero inverted
(NRZI) line encoding to communicate state changes between the subscriber’s
devices across the frame relay network. You can disable communication of such
state changes by setting this parameter to Disable.
See the NRZI Enable parameter on page A-42
for information.
The NRZI Type parameter specifies the NRZI encoding format in the frame on the
logical line. Ignore NRZI Type if you set NRZI Enable to Disable.
Note:
Although the DMCT1 net module does not support FT1 loopback, it
does provide BERT testing on selected DS0s, as described in
“Running Logical Line Tests” later in this chapter.
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