3Com Router Module Guide
Chapter 4
4-32
z
In CT3 mode, providing the subscribers with N x 64 kbps or N x 56 kbps
low-speed access, where N is smaller than or equal to 128.
Note:
T3 represents the tertiary group rate of T system in the TDM system, that is, 44.736 Mbps. Through T23
and T12A demultiplexing, a T3 channel can be channelized into 28 T1 lines, each also supporting the
operating mode of CT1. T23 means either T2-to-T3 multiplex or T3-to-T2 demultiplex, and T12 means
T1-to-T2 multiplex or T2-to-T1 demultiplex. “T23” and “T12” discussed here represent the demultiplex
process.
4.7.2 Interface Attributes
The following table describes the interface attributes of the ROUTER 1-PORT CT3
FIC.
Table 4-17
ROUTER 1-PORT CT3 FIC interface attributes
Attribute
Description
Connector
SMB
Number of connectors
2
Interface standard
G.703, G.704, G.752
Interface rate
44.736 Mbps
Cable
T3 cable (75-ohm coaxial cable)
Operating mode
T3
CT3
Supported service
T3 leased line
4.7.3 Panel and Interface LEDs
The following figure illustrates an ROUTER 1-PORT CT3 FIC panel.
Figure 4-32
ROUTER 1-PORT CT3 FIC panel