Overview of Dial Interfaces, Controllers, and Lines
ISDN Service
DC-13
Cisco IOS Dial Technologies Configuration Guide
Figure 10 Logical Relationship of ISDN PRI Components for T1
The following example is for a Cisco AS5300 access server. It configures one T1 controller for ISDN
PRI, then configures the neighboring D channel (interface serial 0:23). Controller T1 0 and interface
serial 0:23 are both assigned to the first PRI port. The second PRI port is assigned to controller T1 1 and
interface serial 1:23, and so on. The second PRI port configuration is not shown in this example. This
Cisco AS5300 access server is used as part of a stack group dial-in solution for an Internet service
provider.
Router# configure terminal
Router(config)# controller t1 0
Router(config-controller)# framing esf
Router(config-controller)# linecode b8zs
Router(config-controller)# clock source line primary
Router(config-controller)# pri-group timeslots 1-24
Router(config-controller)# exit
Router(config)# interface serial 0:23
Router(config-if)# ip unnumbered Loopback 0
Router(config-if)# ip accounting output-packets
Router(config-if)# no ip mroute-cache
Router(config-if)# encapsulation ppp
Router(config-if)# isdn incoming-voice modem
Router(config-if)# dialer-group 1
Router(config-if)# no fair-queue
Router(config-if)# compress stac
Router(config-if)# no cdp enable
Router(config-if)# ppp authentication chap
Router(config-if)# ppp multilink
Router(config-if)# netbios nbf
B (data channel) 1 S0:0
B (data channel) 2 S0:1
B (data channel) 3 S0:2
B (data channel) 4 S0:3
•••
•••
•••
•••
•••
B (data channel) 21 S0:20
B (data channel) 22 S0:21
B (data channel) 23 S0:22
D (signaling channel) 24 S0:23
S6487
Channel
Type
Time Slot
Number
Logical
contents
of a PRI
interface
Virtual
Serial
Interface
Number
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