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Example: Channelized DS3 IQ Interface Configuration

 
Figure 1: Channelized DS3 IQ Interface Example
Channelized DS3 IQ Interface Example

 

This example shows how to configure a channelized DS3 IQ interface. Figure 1 shows the breakdown of a DS3 interface into a variety of channels. The path that leads to NxDS0 channels is similar to the M13 with C-bit parity method seen previously in the complex OC12 configuration example (see Example: Complex Configuration for a Channelized OC12 IQ Interface). This method breaks the channelized DS3 IQ interface into channelized T1s before additional splits create DS0 time slots.

To create T1 channels, include the partition statement at the [edit interfaces ct3-fpc/pic/port] hierarchy level with the interface-type t1 option. To create channelized T1 channels, include the partition statement at the [edit interfaces ct3-fpc/pic/port] hierarchy level with the interface-type ct1 option.

After you have established a channelized T1 channel, you can split it into a maximum of 24 NxDS0 channels. To configure NxDS0 channels, include the partition statement at the [edit interfaces ct1-fpc/pic/port:channel] hierarchy level with the timeslots and interface-type ds options to create the desired number of NxDS0 channels or channel groups.

Although it is not part of the example shown, you can also create a clear channel T3 or a fractional T3 interface on a channelized DS3 IQ interface. To configure a clear channel T3 or fractional T3 interface, include the no-partition statement at the [edit interfaces ct3-fpc/pic /port] hierarchy level. After you commit this part of the configuration, a clear channel T3 interface is established. You can configure standard T3 options on this interface. To fractionalize the T3 interface, include the timeslots statement at the [edit interfaces t3-fpc/pic/port t3-options] hierarchy level.

Router A

Verifying Your Work

To verify correct operation of a channelized DS3 IQ interface, use the following commands:

  • show interfaces

  • show interfaces controller

  • show interfaces interval (for T3, channelized T3, T1, and channelized T1 channels)

To view the interface names of the physical channelized DS3 IQ interface and the channels configured on this interface, use the show interfaces controller command:

user@RouterA> show interfaces controller ct3-0/0/1

To view information about the physical channelized interface, include the ct3-fpc/pic/port option with the show interfaces command:

user@RouterA> show interfaces extensive ct3-0/0/1

To view information about a channelized T1 channel, include the ct1-fpc/pic /port:channel option with the show interfaces command:

user@RouterA> show interfaces extensive ct1-0/0/1:2

To view information about an NxDS0 interface, include the ds-fpc/pic/port:channel option with the show interfaces command. In this case, the speed is 640 Kbps because this channel contains 10 DS0s (64 x 10 = 640).

user@RouterA> show interfaces extensive ds-0/0/1:2:1