3com MSR 20 Manual De Usuario
180
C
HAPTER
4: F
LEXIBLE
I
NTERFACE
C
ARDS
Step 1: Connect the SMB connector of an E3/T3 cable to the Tx port on the
FIC-1CE3 and the other end to the Rx port on another device.
FIC-1CE3 and the other end to the Rx port on another device.
Step 2: Connect the SMB connector of another E3/T3 cable to the Rx port on the
FIC-1CE3 and the other end to the Tx port on another device.
FIC-1CE3 and the other end to the Tx port on another device.
Step 3: Power on the router, and check the behavior of the LINK LED on the
FIC-1CE3 panel: OFF means fault occurs on the line and the signal is not
synchronized. Check the line status.
FIC-1CE3 panel: OFF means fault occurs on the line and the signal is not
synchronized. Check the line status.
FIC-1CT3
Introduction
FIC-1CT3, the 1-port channelized T3 interface card, delivers these functions:
■
In T3 mode, transmitting, receiving, and processing one channel of T3 fast
traffic; providing T3 traffic access.
traffic; providing T3 traffic access.
■
In CT3 mode, providing the subscribers with N
× 64 kbps or N × 56 kbps
low-speed access, where N is smaller than or equal to 128.
n
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.
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.
Interface Attributes
The following table describes the interface attributes of the FIC-1CT3.
Interface LEDs
The following figure illustrates an FIC-1CT3 panel.
Table 124 FIC-1CT3 interface attributes
Attribute Description
Connector SMB
Number of connectors
2
Interface standard
G.703
G.704
G.752
AT&T TR 54014
AT&T TR 62415
ANSI T1.107
Interface rate
44.736 Mbps
Cable
T3 cable (75-ohm coaxial cable)
Operating mode
T3
CT3
Supported service
T3 leased line