Com.X Administrator Guide
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the BRI bus (this is the usual case), enable this setting.
If multiple devices are attached to the BRI cable (point-to-
multipoint) and another device is providing termination, the
Com.X can be configured not to terminate.
A BRI link should always be terminated by a device on at least
one side of the BRI connection, or electrical reflection on the link
could interfere with BRI signaling and result in loss of layer 1 link
establishment, or CRC errors.
Echo canceler
The echo cancellation delay and algorithm to be employed on the
port. The delay up to which the echo canceler can compensate is
specified in milli-seconds. An optional non-linear processing
echo suppression algorithm (NLP) can also be employed during
echo cancellation. If you expect the devices connected to the port
to be in a noisy environment how-ever, you might prefer not to
enable NLP, as it might result in the far-end noise being cut off
when speech ceases. Some local users may find this
uncomfortable. NLP is recommended for quiet remote
environments. Please see section 3.6.8.1 for a detailed
discussion around echo cancellation.
Note: This setting applies to all BRI ports in the same BRI trunk
group as this BRI port. This option is not available if the port is
not part of at least one BRI trunk group.
Detect Fax
When enabled, all BRI ports in all trunk groups to which this BRI
port belongs will detect fax tones and disable echo cancellation
for the duration of a fax call. We recommend enabling this feature
on all BRI ports that are likely to support fax calls.
Note: This option is not available if the port is not part of at least
one BRI trunk group.
Table 8: BRI port configuration
3.6.4 Configuring PRI
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Physical interface The service offering, either 23B+D T1 or 30B+D E1. For E1,
double frame or CRC4 multi-frame can be enabled, and for T1
framing can be either Super Frame (D4) or Extended Super
Frame (ESF, using CRC-6) The physical interface configuration
must match that of the PRI peer.
Switch type
National switch type options are:
US National ISDN phase 1 (NI-1)
US National ISDN phase 2 (NI-2)
ETSI “Euro” ISDN: Europe ISDN standard
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