3Com 3C10111C - NBX 100 - Modular Exp Base Installation Manual page 137

Verifying a BRI-ST Digital Line Card 137
After you connect an ISDN BRI span to a port on the BRI-ST Digital Line
Card, the D light turns green if the span is operating properly, and turns
amber if there is a problem.
For a span that is operating properly, when the NBX system initiates a call
on a B channel, the corresponding light initially turns amber. When the
call is answered, the light turns green. Similarly, when the NBX system
receives a call on a B channel, the corresponding light initially turns
amber. When the NBX system answers the call, the light turns green.
You are now ready to configure the ISDN BRI-ST Digital Line Card. See
Chapter 3, "Device Configuration," in the NBX Administrator's Guide.