
ISDN BRI Adapter Module
Supplement
1-4
303125-B Rev 00
The ISDN BRI adapter module LEDs light when the interface is active; they turn
off when the interface is inactive. Table 1-2 describes the ISDN adapter module
LEDs.
Table 1-2. ISDN BRI LEDs
LED Meaning
S/T Interface
Unlabeled LED Lights when the router is using the D-channel.
U Interface
D (D-channel; 16 KB
Management Channel)
Lights when the router is using the D-channel.
DD (Data Detect) Lights when the ISDN-BRI interface detects connection to an
external switch device.
B1 (B-Channel #1; 64 KB
Data Channel)
Lights when the router is using B-channel #1.
B2 (B-Channel #2; 64 KB
Data Channel)
Lights when the router is using B-channel #2.
Note:
The ISDN BRI adapter module LEDs will blink on and off during
diagnostic testing, but do not indicate data transfer until you have configured
and enabled ISDN software services.
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