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+ + 4.2 + ISDN Configuration 
  + 4.2.2 + Configuring ISDN PRI 
+ + + + + + +
+ +

+ ISDN PRI is delivered over a leased T1 or + E1 line. The main PRI configuration tasks are as follows: +

+
    +
  1. Specify the correct PRI switch + type that the router interfaces with at the CO of + the ISDN provider.
    2. +
  2. Specify the T1/E1 controller, framing type, and line coding for + the facility of the ISDN provider.
    3. +
  3. Set a PRI group timeslot for the T1/E1 facility and indicate the + speed used.
    4. +
+

Because routers connect to PRI using + T1/E1, there is no "interface pri” command. Instead, the physical + interface on the router that connects to the leased line is called a + T1 controller, or an E1 controller, if an E1 line is being used. This + controller must be configured properly in order to communicate with the + carrier network. The ISDN PRI D and PRI B channels are configured + separately from the controller, using the + interface serial command. +

+

Use the + isdn switch-type command to + specify the ISDN switch used by the provider to which the PRI + connects. As with BRI, this command can be issued globally or in + interface configuration mode. The table shows the switch types + available for ISDN PRI configuration: +

+
+

Router(config)#isdn + switch-type + primary-net5

+
+

Configuring a T1 or E1 controller is + done in four parts: +

+
    +
  1. From global configuration mode, + specify the controller and the slot/port in the router where the PRI + card is located: + +

    Router(config)#controller + {t1 | + e1} {slot/port}
    + Router(config-controller)#

    2. +
    + 
  2. Configure the framing, line coding, and clocking, as dictated by + the service provider. The + framing + command is used to select the frame + type used by the PRI service provider. For T1, use the following + command syntax: + +

    Router(config-controller)#framing {sf | esf}

    +     + For E1 lines, use the + framing + command with the following options: + +

    Router(config-controller)#framing {crc4 | no-crc4} + [australia]

    +     + Use the + linecode + command to identify the physical-layer signaling + method on the digital facility of the provider: + +

    Router(config-controller)#linecode {ami | b8zs| + hdb3}

    +     +

    In North America, the B8ZS signaling method is used for T1 carrier + facilities. It allows a full 64 kbps for each ISDN channel. In Europe, + it is typically HDB3 encoding that is used.

    +
    3. +
  3. Configure the specified interface for PRI operation and the number + of fixed timeslots that are allocated on the digital facility of the + provider: + +

    Router(config-controller)#pri-group [timeslots + range]

    + +

    For T1, the range of timeslots used is 1-24. For E1 the range of + timeslots used is 1-31.

    +
    4. +
  4. Specify an interface for PRI D-channel operation. The interface + is a serial interface to a T1/E1 on the router: +

    Router(config)#interface serial{slot/port: | unit:}{23 | 15} +

    5. +
+

Within an E1 or T1 facility, the + channels start numbering at 1. The numbering ranges from 1 to 31 for + E1 and 1 to 24 for T1. Serial interfaces in the Cisco router start + numbering at 0. Therefore, channel 16, the E1 signaling channel, is + channel 15 on the interface. Channel 24, the T1 signaling channel, + becomes channel 23 on the interface. Thus, interface serial 0/0:23 + refers to the D channel of a T1 PRI.

+

Subinterfaces, commonly used with Frame + Relay, are designated with a dot, or period. For example, Serial + 0/0.16 is a subinterface. Do not confuse the channels of a T1 or E1 + with subinterfaces. Channels use a colon instead of a dot to indicate + the channel number:

+
    +
  • S0/0.23 refers to a Subinterface
    • +
  • S0/0:23 refers to a channel +
    • +
+   + + + + +
+ + +
+ + + + + +
+ + + + + +
  +

+ + + + Lab Activity

+ +

e-Lab Activity: + + isdn switch-type

+ +

In this activity, the student will demonstrate how to use the + + isdn switch-type + command.

+ +

+
+     + + + + + + +
+ + + + + +
+ +
+ + + + + +
+ + + + + +
  +

+ + Web Links

+ + +

Configuring ISDN PRI

+ + http://www.cisco.com/en/US/products/sw/ + iosswrel/ps1835/products_configuration_ + guide_chapter09186a00800ca71d.html

+ +

+

+
+
+

+       + +     +

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