Nortel Secure Router 4134 Installation Manual page 24

24 Nortel Secure Router 2330/4134 hardware components fundamentals
The ISDN BRI U module provides two ISDN BRI U interface ports, each
supporting two data timeslots. The ISDN BRI U interface provides a
data bandwidth of 128 Kbps (two 64 Kbps B-channels), and a 16 Kbps
management channel (d-channel).
For voice connections, each ISDN BRI U interface provides two
B-channels for voice traffic and one D-channel for signaling.
You can use the ISDN BRI S/T Small Module only at the user end
(Terminal Equipment [TE]) of a point-to-point S/T, four-wire, interior S or T
link. You cannot use the ISDN BRI S/T module as the NT end of an S/T
link, or in passive bus or star applications. Terminating resistors are fixed
on the module and cannot be removed.
You can use the ISDN BRI S/T Small Modules for either data or voice
connections. You can configure each port on the 2-port ISDN BRI S/T
Small Module in either data or voice mode.
The ISDN BRI S/T module provides two ISDN BRI S/T interface ports,
each supporting two data timeslots. The ISDN BRI S/T interface provides
a data bandwidth of 128 Kbps (two 64 Kbps B-channels), and a 16 Kbps
management channel (d-channel).
For voice connections, each ISDN BRI S/T interface provides two
B-channels for voice traffic and one D-channel for signaling.
You can install the 2-port ISDN BRI Small Modules in any of the Small
Module slots on the Secure Router 2330/4134 chassis.
ATTENTION
Slot 2 of the Secure Router 4134 supports only one port of any WAN data Small
Module. If you install a 2-port Small Module in Slot 2, and use the Small Module
for data connections, one port only is functional (port 1).
This limitation also applies to the 2-port T1/E1 and ISDN BRI Small Modules if
they are configured for voice traffic: only port 2/1 is functional. This limitation
does not apply to FXS or FXO voice modules.
This limitation does not apply to the Secure Router 2330.
The following figure shows the 2-port ISDN BRI S/T Small Module.
Nortel Secure Router 2330/4134
Installation — Hardware Components
NN47263-301 03.01 7 September 2009
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