Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 123

Chapter 6 Connecting ISDN BRI Network Modules
BRI U Module LEDs
Figure 6-9
BRI U network module.
Figure 6-9
BRI
U
Figure 6-10 8-Port ISDN BRI U Network Module LEDs
BRI
U
All network modules have an enable (EN) LED. This LED indicates that the module has passed its
self-tests and is available to the router.
In addition, BRI U modules have three LEDs for each port. Two of these LEDs indicate call activity on
the two ISDN BRI B channels, as described in
synchronization status of the NT1.
Table 6-2
LED
B1
B2
NT1
OL-2485-20
shows LEDs for the 4-port BRI U network module.
4-Port ISDN BRI U Network Module LEDs
BRI 3 BRI 2
B1 B1
B2 B2
ISDN BRI LEDs
BRI 7 BRI 6
B1 B1
B2 B2
BRI 3 BRI 2
B1 B1
B2 B2
ISDN BRI LEDs
BRI U Network Modules LEDs
Meaning
Activity on B1 channel
Activity on B2 channel
Synchronous status of NT1
4- and 8-Port ISDN BRI U Network Modules
Figure 6-10
NT1 LEDs
BRI 1 BRI 0
B1 B1
B2 B2
NT1 LEDs
BRI 5 BRI 4
B1 B1
B2 B2
BRI 1 BRI 0
B1 B1
B2 B2
Table 6-2. The third LED, labeled NT1, indicates
Cisco Network Modules Hardware Installation Guide
shows LEDs for the 8-port
EN
Enable LED
EN
Enable LED
6-5