Cisco 2600 Series Operation Manual page 73

4-Port and 8-Port ISDN BRI S/T Network Modules
This section provides information about the following network modules for Cisco modular
routers:
•
4-port ISDN BRI network module—(Cisco product number NM-4B-S/T or
CPANM-4B-S/T). Connects to an ISDN WAN through an external Network
Termination 1 (NT1) device (also known as an S/T interface). (See Figure 7-1.) This
module is also referred to as the 4-port BRI S/T network module.
•
8-port ISDN BRI network module—(Cisco product number NM-8B-S/T or
CPANM-8B-S/T). Connects to an ISDN WAN through an external NT1 device (also
known as an S/T interface). (See Figure 7-2.) This module is also referred to as the
8-port BRI S/T network module.
Figure 7-1
BRI
S/T
Figure 7-2
BRI
S/T
4-Port ISDN BRI Network Module (S/T Interface)
8-Port ISDN BRI Network Module (S/T Interface)
BRI S/T ports (RJ-45)
BRI 7 BRI 6 BRI 5 BRI 4
B1 B2 B1 B2 B1 B2 B1 B2
Connecting ISDN BRI Network Modules to a Network 7-3
4-Port and 8-Port ISDN BRI S/T Network Modules
BRI 3 BRI 2 BRI 1 BRI 0
B1 B2 B1 B2 B1 B2 B1 B2
BRI S/T LEDs
BRI S/T ports (RJ-45)
BRI 3 BRI 2 BRI 1 BRI 0
B1 B2 B1 B2 B1 B2 B1 B2
EN
Enable LED
EN