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Basic T1-PRI configuration (LAB Recreation) Service-Provider and Branch

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Configuring T1-PRI example

What is a PRI?

The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for carrying multiple DS0 voice and data transmissions between the network and a user. PRI is the standard for providing telecommunication services to offices.

 

Topology Lab
Service-Provider Router -------T1-PRI-----Voice Gateway

Service Provider configuration

1- Enable the T1 Controller

Service-Provider(config)#
Service-Provider(config)#card type t1 0 2
Service-Provider(config)#isdn switch-type primary-ni

2- Enable clocking. Clocking will be provided by the Service Provider to the Branch Router.

Service-Provider(config)#network-clock-participate wic 2

3- Configure the Controller

Service-Provider#controller t1 0/2/0
Service-Provider(config-controller)#pri-group timeslots 1-3

This command "pri-group timeslots 1-3"give us the available channels that this T1 
will be using to send calls to the Branch Router.

Service-Provider(config-controller)#linecode b8zs
Service-Provide(config-controller)r#framing esf
Service-Provider(config-controller)#clock source Internal 

This command "clock source Internal" set the clocking as Internal which in basic words will provide the clocking reference to the Branch.

Service-Provider#no shutdown

2

 

4- At this point interface serial 0/2/0:23 should be created so lets go ahead and configure it.

Service-Provider(config)#interface Serial0/2/0:23
Service-Provider(config-if)#isdn switch-type primary-ni
Service-Provider(config-if)#isdn protocol-emulate network

This command"isdn protocol-emulate network"will verify that this interface will be acting as the Service-Provider providing all services needed to complete the connection

1

Branch Configuration (Configuration that we do see)

Pretty much the configuration looks the same with the only difference that on the highlighted commands above we will see some little changes.

1- Enable the T1 Controller

Branch(config)#
Branch(config)#card type t1 0 2
Branch(config)#isdn switch-type primary-ni

2- Enable clocking.

UC520(config)#network-clock-participate wic 2
Branch(config)#network-clock-select 1 t1 0/2/0

3- Configure the Controller

Branch(config)#controller t1 0/2/0
Branch(config-controller)#pri-group timeslots 1-3
Branch(config-controller)#linecode b8zs
Branch(config-controller)#framing esf
Branch(config-controller)#clock source line      
Branch(config-controller)#no shutdown

4- At this point interface serial 0/2/0:23 should be created so lets go ahead and configure it.

Branchconfig)#interface Serial0/2/0:23
Branch(config-if)#isdn switch-type primary-ni
Branch(config-if)#isdn protocol-emulate user

Important: Take a look at the highlighted words were actually make the difference between being a service provider or a Branch receiving the service.

Verify if the PRI status is now UP

Command

show isdn status

 

 

Some other commands:

show controller t1

show voice-port x/x/x:23

debug isdn q921

Troubleshooting

http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/8131-T1-pri.html

regards,

Gerson Fabian Morales Marin (gersomor)