3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual page 15

3Com Router Module Guide
Chapter 1 Overview
If the installed SIC/MIM is in abnormal state, check that:
Proper interface cable is used;
The LEDs on the panel of SIC/MIM are displaying normally (see the section
introducing the SIC/MIM for its LED status and description);
The SIC/MIM accepts the configuration and works well using the display
command.
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