User`s guide

Configuring the WAN Interfaces
Configuring T1 lines
MultiVoice Gateway for the MAX— User’s Guide Preliminary November 23, 1998 5-5
Understanding the channel configuration parameters
Each of the 24 channels of a T1 line may be configured for one of the following uses:
Examples of T1 configuration
This section provides examples of configuring T1 lines for ISDN PRI service, robbed-bit
signalling, and NFAS signalling.
Configuring a line for ISDN PRI service
When configuring ISDN PRI service for your MultiVoice Gateway units, you must configure
ISDN signalling for the line. Optionally, you can also configure the MultiVoice Gateway to
send either ISDN code 16 (Normal call clearing) or code 17 (User busy) when the PRI switch
servicing the MultiVoice Gateway triggers the T310 timer.
Example of configuring ISDN signalling
To configure ISDN signalling on Line 1 of the currently open T1 module:
1 Open Net/T1 > Line Config and set the 1st Line to Trunk:
Net/T1
Line Config
Name=
1st Line=Trunk
2nd Line=Disabled
2 Open the Line 1 subprofile and set the signalling mode to ISDN:
Line 1...
Sig Mode=ISDN
3 Specify the framing and encoding values to ESF and B8ZS, respectively (for example):
Framing Mode=ESF
Encoding=B8ZS
4 Close the T1 profile.
Use Description
Switched (the default) Supports switched connections. Can be robbed-bit or a B channel,
depending on the line’s signalling mode.
Nailed A clear-channel 64k circuit.
D channel The channel used for ISDN D-channel signalling. Assigned
automatically to channel number 24 when ISDN signalling is in use.
NFAS-Prime Primary D channel for two T1 lines that support NFAS signalling.
Used as the D channel for both lines, unless it becomes unavailable.
NFAS-Second Secondary D channel for two T1 lines that support NFAS signalling.
Used as the secondary (backup) D channel.
Unused Unavailable for use.