Nortel Secure Router 4134 Installation — Hardware Components page 28

28 Nortel Secure Router 4134 hardware components fundamentals
Figure 3
1-port T1/E1 Small Module
Figure 4
2-port T1/E1 Small Module
In data mode, the 1-port T1/E1 Small Module provides either one T1 port
(supports 24 timeslots with a line data rate of 1.544 Mbps) or one E1 port
(supports 31 timeslots with a line data rate of 2.048 Mbps).
In voice mode, the T1/E1 Small Module supports Channel Associated
Signaling (CAS) to provide the Secure Router 4134 with connections to the
Public Switched Telephone Network (PSTN). The T1/E1 Small Module
supports CAS only when you configure the module for T1 connections.
The Secure Router 4134 does not support E1 CAS.
You can also configure the 1- and 2-port T1/E1 Small Modules to operate
as Integrated Services Digital Network (ISDN) primary rate interface (PRI)
connections, providing 23 (T1) or 30 (E1) bearer channels (B-channel) for
data and 1 D-channel for signaling. The Secure Router 4134 supports
ISDN PRI for voice on T1 connections only (23 B-channels and 1
D-channel for signaling).
The 2-port T1/E1 Small Module provides either two T1 ports or two E1
ports.
Copyright © 2007, 2008 Nortel Networks
.
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301 02.01 Standard
18 February 2008