Configuring Additional Features on the Cisco VGD 1T3 Voice Gateway
Configuring ISDN NFAS on Channelized T1 PRI Groups
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Cisco VGD 1T3 Voice Gateway Software Configuration Guide
Configuring ISDN NFAS on Channelized T1 PRI Groups
ISDN Non-Facility Associated Signaling (NFAS) allows a single D channel to control multiple PRI
interfaces. A backup D channel can also be configured for use when the primary NFAS D channel fails.
When configuring NFAS for T1 controllers configured for ISDN, you use an extended version of the
ISDN pri-group command to specify the following:
•
Range of PRI time slots to be under the control of the D channel (time slot 24)
•
Function to be performed by time slot 24 (primary D channel, backup, or none); the last specifies
its use as a B channel
•
Group identifier number for the interface under control of this D channel
Note
Your Cisco VGD 1T3 voice gateway must connect to a Primary-4ESS, Primary-DMS 100, or Primary-NI
switch and must also have a channelized T1 controller and, as a result, be ISDN PRI capable.
To configure ISDN NFAS, complete the following tasks in controller configuration mode:
Taking a Channel or Interface Out of Service
You can take a specified channel or an entire PRI interface out of service or put it into one of the other
states that is passed on to the switch.
To do so, enter one of the following commands in interface configuration mode:
These are the supported state values:
•
0—In service
•
1—Maintenance
•
2—Out of service
Command
Purpose
Router(config-controller)#
pri-group
timeslots 1-24 nfas_d primary
nfas_interface
number
nfas_group
number
On one channelized T1 controller, configures the
NFAS primary D channel.
Router(config-controller)#
pri-group
timeslots 1-24 nfas_d backup nfas_interface
number
nfas_group
number
On a different channelized T1 controller,
configures the NFAS backup D channel to be used
if the primary D channel fails.
Router(config-controller)#
pri-group
timeslots 1-24 nfas_d none
nfas_interface
number
nfas_group
number
(Optional) On other channelized T1 controllers,
configures a 24 B channel interface, if desired.
Command
Purpose
Router(config-controller)#
isdn service dsl
number
b_channel
number
state
state-value
Takes an individual B channel out of service or
sets it to a different state.
Router(config-controller)#
isdn service dsl
number
b_channel 0 state
state-value
Sets the entire PRI interface to the specified state.
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