6-3
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 6 Connecting ISDN BRI Network Modules
4- and 8-Port ISDN BRI U Network Modules
BRI S/T Module LEDs
Figure 6-4
shows LEDs for the 4-port BRI S/T network module.
Figure 6-5
shows LEDs for the 8-port
BRI S/T network module.
Figure 6-4
4-Port ISDN BRI S/T Network Module LEDs
Figure 6-5
8-Port ISDN BRI S/T Network Module LEDs
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 S/T modules have two LEDs for each port. These LEDs indicate call activity on the two
ISDN BRI B channels, as described in
Table 6-1
.
4- and 8-Port ISDN BRI U Network Modules
This section provides information about the following network modules for Cisco modular routers:
•
4-port ISDN BRI with NT1 network module (NM-4B-U or CPANM-4B-U) (see
Figure 6-6
). This
module connects to an ISDN WAN using a built-in NT1 device (also known as a
U interface
). It is
also referred to as the
4-port BRI U network module
.
•
8-port ISDN BRI with NT1 network module (NM-8B-U or CPANM-8B-U) (see
Figure 6-7
). This
module connects to an ISDN WAN using a built-in NT1 device (also known as a
U interface
). It is
also referred to as the
8-port BRI U network module
.
BRI 3
BRI 2
BRI 1
BRI 0
EN
BRI
S/T
H7267
BRI S/T LEDs
B1
B2
B1
B2
B1
B2
B1
B2
Enable LED
BRI 7
BRI 6
BRI 5
BRI 4
BRI 3
BRI 2
BRI 1
BRI 0
EN
BRI
S/T
H7266
BRI S/T LEDs
BRI S/T LEDs
B1
B2
B1
B2
B1
B2
B1
B2
B1
B2
B1
B2
B1
B2
B1
B2
Enable LED
Table 6-1
BRI S/T Network Module LEDs
LED
Meaning
B1
Call active on B1 channel
B2
Call active on B2 channel