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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-37
4.11.5 Connecting the Interface Cable
Caution:
By design, the 8.8 Router 1-Port E3 ATM FIC is protected against lightning strikes. But when outdoor
cabling is involved, you are recommended to add a special lightning arrester at the input end of the
E3/T3 cable for better protection.
Step 1: Connect the SMB connector of an E3/T3 cable to the Tx port on the 8.8
Router 1-Port E3 ATM FIC and another 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 8.8
Router 1-Port E3 ATM FIC and another end to the Tx port on another device.
Step 3: Check the behavior of the LINK LED on the 8.8 Router 1-Port E3 ATM FIC
panel: OFF means fault occurs on the line and the signal is out of synchronization.
Check the line status.
4.12 Router 1-Port T3 ATM FIC
4.12.1 Introduction
Router 1-Port T3 ATM FIC, the 1-port 44Mbps ATM-T3 interface card, provides these
functions:
z Two ATM cell mapping modes: ADM and PLCP.
z Scrambling in data transmission.
z Line clock (when working as DTE interface) and internal clock (when working as
DCE interface).
z Four types of test measures: local cell loopback, local loopback, remote payload
loopback, and remote line loopback.
Note:
You may equip your router with Router 1-Port T3 ATM FIC cards to its full capacity. Yet, you are
recommended to install only one Router 1-Port T3 ATM FIC on it, whatever its model is, to ensure
performance of some key services.
4.12.2 Interface Attributes
The following table describes the interface of the Router 1-Port T3 ATM FIC.