3Com 3C13840, Installation Manual

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72 C
HAPTER
8: F
LEXIBLE
I
NTERFACE
C
ARDS
Table 11 LED description of 1-port E3 FIC
Interface Cable The external interface provided by 1-port Channelized E3 FIC is two SMB sockets
respectively for Tx (Transmit end) and Rx (Receive end). The interface adopts the
75ohm unbalanced transmission mode and uses a pair of 75-ohm unbalanced
coaxial cables to connect the peer device.
Figure 14 E3/T3 cable
Connect Interface Cable
CAUTION: Some measures have been taken to protect 1-port Channelized E3 FIC.
To achieve better lightning protection effects, however, you are recommended to
add a special lightning arrester at the input end of the E3/T3 cable if it is led
outdoors.
1 Connect the SMB connector of an E3/T3 cable to the Tx port of 1-port E3 FIC and
another end to the Rx port of the peer equipment.
2 Connect the SMB connector of another E3/T3 cable to the Rx port of 1-port E3 FIC
and another end to the Tx port of the peer equipment.
3 Power on the Router, and check the status of the LINK LED on the 1-port E3 FIC
panel. An OFF LED means that the line has failed and the signal has not been
synchronized. Check the line in this case.
1-port Channelized T3
1CT3 (3C13889)
The main functions of 1-port Channelized T3 FIC include:
■
Working in T3 mode, the card can transmit/receive and process the fast traffic
of one T3 channel, as well as provide the accessing of T3 traffic.
■
Working in CT3 mode, the card can provide the subscribers with the low-speed
accessing service at the speed of Nx64kbps, given N is smaller than or equal to
128.
T3 represents the tertiary group rate of T system in the TDM system, that is,
44.736Mbps.Through the demultiplexing processes of T23 and T12A, a T3
channel can be channelized into 28 T1 lines, each also supporting the operating
mode of CT1. T23 is used to indicate either T2-to-T3 multiplex or T3-to-T2
LINK
OFF means the link is not connected and ON means the link is
connected.
ACT
OFF means no data is being transceived on the interface and blinking
means data is being transceived.
BNC connector SMB connector BNC connector SMB connector