4-20
Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter4 Configuring VISM Features
Configuring VISM Features
•For template number 3:
–
For VISM, in the range from 1 to 120
–
For VISM-PR T1, in the range from 1 to 192
–
For VISM-PR E1, in the range from 1 to 248
•For template number 4:
–
For VISM-PR, in the range from 1 to 144
Step 4 Type the cnfds0loop command, line-num, ds0-num, and loopback-type argument values, and press Enter
to place a specific DS1/DS0 into one of three loopback states. Specify the arguments with the fo llo wing
values:
•line-num: In the range from 1 to 8
•ds0-num:
–
In the range from 1 to 31 for E1 lines
–
In the range from 1 to 24 for T1 lines
•loopback-type:
–
1 = No loopback
–
2 = Remote loopback
–
3 = Local loopback
You have completed adding and configuring a DS1 line and DS0 endpoints. Proceed to one of the
following sections:
•“Configuring TDM Side Signaling for Applications Using CCS” section on page 4-20.
•“Configuring TDM Side Signaling for Applications Using CAS” section on p ag e 4-23.
Configuring TDM Side Signaling for Applications Using CCS
Note If your application requires CAS signaling, proceed to the “Configuring TDM Side Signali ng f or
Applications Using CAS” section on page 4-23.
CCS signaling uses a dedicated channel on a DS1 line to carry the signaling for the other channels on
the line. You must identify the signaling channel to the VISM card. CCS signaling is used for the
following operating modes:
•VoIP trunking.
•AAL2 trunking—Signaling is transported across the trunk as Q.931 messages in ATM cells using
AAL5.
•Switched AAL2 PVC—Signaling is backhauled to the call agent using Q.921 frames on the TDM
side and RUDP/UDP/IP/Q.2931 on the call agent side.