Nortel Secure Router 8012
Hardware Description 4 Boards
Issue 5.3 (6 April 2009) Nortel Networks Inc. 4-25
Item Description
Rate 1000 Mbit/s
4.7 Channelized and unchannelized E1/T1 interface module
The channelized and unchannelized E1/T1 interface modules of the Secure Router 8012 are as
follows:
z FIC
− 4-port unchannelized E1 module (4E1)
− 4-port channelized E1 module (4CE1)
− 8-port unchannelized E1 module (8E1)
− 8-port channelized E1 module (8CE1)
− 4-port channelized T1 module (4CT1)
− 8-port channelized T1 module (8CT1)
z HIC
− 16-port channelized E1 module (RT-HIC-16CE1)
− 16-port channelized T1 module (RT-HIC-16CT1)

4.7.1 Functions

Channelized and unchannelized E1/T1 interface modules can transmit, receive, and process
E1/T1 data flow. The channelized E1/T1 module offers access to CE1/CT1 and implements
the Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) function.
The functions are as follows:
z supports the internal and external clocks
z supports the working modes of the remote loops, the local loops, and the frame loops
z supports various link layer protocols, such as PPP, Frame Relay, and High-level Data
Link Control (HDLC)
The primary differences between unchannelized E1 interface modules and channelized E1
interface modules are as follows:
z Unchannelized interface modules support binding only once. That is, multiple
unchannelized interface modules can be bound with one channel with a speed of 2.048
Mbit/s.
z Channelized interface modules support multiple bindings. That is, 31 channels can be
bound into several groups.
The channelized T1 module supports two working modes: T1 mode and CT1 mode:
z In T1 mode, channels can be bound only once; that is, channels can be bound into one
group with a speed of 1544 kbit/s.