User guide

7-8
Cisco Media Gateway Manager for the Cisco MGX 8260 Media Gateway User Guide
Release 1.0, Part Number 78-11705-01, December 2000
Chapter 7 Cisco MGX 8260 Node Management
Configuring D Channels
Figure 7-4 D Channel to Media Gateway Controller
Each BSC contains 168 T1 lines, each a potential Primary Rate ISDN line. An ISDN line contains 24
channels, one of which is the D Channel that carries the signaling information for the other 23 channels.
The BSC card can terminate a D Channel signaling stack and pass the payload to an MGC, via the SCC,
using a backhaul session.
The following procedures describe how to configure a D Channel for a backhaul session. The procedures
assume you already have a DS3 line, and have provisioned a PRI ISDN line on one of its circuits. ISDN
D Channels can be difficult to configure because they have many settings, so the Cisco MGX 8260
Media Gateway simplifies the process by grouping common settings into two types of profiles:
• Digital Link Service Access Profile (DLSAP)
• Media Access Control Service Access Profile (MACSAP)
When adding D Channels, you simply specify suitable profiles that contain the desired configuration set.
You can create profiles using default settings that accommodate the signaling requirements for common
applications.
Configuring D Channels
The Cisco MGX 8260 Media Gateway simplifies the process of creating D Channels with DLSAP and
MACSAP profiles. These profiles provide a template of parameter settings that you apply when adding
D Channels. Changes you make to the profiles apply only to lines you subsequently add, not to lines that
already exist. If you want to change the configuration of a D Channel, delete it first and then recreate a
new one using the new template.
The following section describes the high-level procedure for configuring a D Channel on an existing
DS3 trunk:
Step 1 Define a DLSAP profile.
Step 2 Define a MACSAP profile.
Step 3 Define a D Channel on a PRI ISDN line within the DS3 trunk, using the profiles you defined in Steps 1
and 2.
Channel
Bank
MGCBSC
DS3 Session
SCC
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