Specifications

2-22
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 2 Commissioning the Cisco AS5300 Hardware
Configuring the Serial Interfaces
Serial0:11 unassigned YES unset down down
Serial0:12 unassigned YES unset down down
Serial0:13 unassigned YES unset down down
Serial0:14 unassigned YES unset down down
Serial0:15 unassigned YES unset down down
Serial0:16 unassigned YES unset down down
Serial0:17 unassigned YES unset down down
Serial0:18 unassigned YES unset down down
Serial0:19 unassigned YES unset down down
Serial0:20 unassigned YES unset down down
Serial0:21 unassigned YES unset down down
Serial0:22 unassigned YES unset down down
Serial0:23 unassigned YES unset up up
. . .
Snip
Task 4. Configuring the Serial Interfaces
Configure the serial D channels to route incoming voice calls from the PSTN to the integrated modems.
The behavior of the B channels is controlled by the D channels’ configuration instructions.
The D channel is the signaling channel.

After timeslots are assigned by the
pri-group
command, D-channel serial interfaces are
automatically created in the configuration file (for example S0:23, S1:23, and so on).

Individual B-channel serial interfaces are created as rotary members of their signaling D channels
(for example S0:0 through S0:22). The D-channel interface functions like a dialer for all the
23 B-channels using the controller.
Table 2-7 describes the relationship between T1 controllers and serial interfaces.
Step 1
Apply the
isdn incoming-voice modem
command to each D-channel serial interface:
!
interface Serial0:23
isdn incoming-voice modem
!
interface Serial1:23
isdn incoming-voice modem
!
interface Serial2:23
isdn incoming-voice modem
Table 2-7 Controller-to-Channel Relationships
T1 Controllers D Channels B Channels
Controller T1 0 Interface serial 0:23 S0:0 through S0:22
Controller T1 1 Interface serial 1:23 S1:0 through S1:22
Controller T1 2 Interface serial 2:23 S2:0 through S2:22
Controller T1 3 Interface serial 3:23 S3:0 through S3:22
... ... ...