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Example: Channelized T1 IQ Interface Configuration

Figure 7: Channelized T1 IQ Interface Example

Image g017133.gif

The following example shows two ways to configure a channelized T1 IQ interface. Figure 7 shows a fractional T1 method and the NxDS0 method seen previously in the complex OC12 configuration example (see Example: Complex Configuration for a Channelized OC12 IQ Interface). The NxDS0 method breaks the channelized T1 IQ interface into discrete DS0 blocks, whereas the fractional method creates a clear channel T1 that is segmented by time slots.

To configure NxDS0 channels, include the partition statement at the [edit interfaces ct1-fpc/pic/port] hierarchy level. Include the timeslots and interface-type ds options to create the desired number of NxDS0 interfaces in time slots 1 through 24.

To configure a clear channel T1 on a channelized T1 IQ interface, include the no-partition statement with the interface-type t1 option at the [edit interfaces ct1-fpc/pic/port] hierarchy level. After you commit this configuration, you can create a fractional T1 on the clear channel T1 interface. To do so, include the timeslots statement at the [edit interfaces t1-fpc/pic/port t1-options] hierarchy level and specify the number of DS0 blocks to be allowed in the fractional T1 interface. The minimum number of 64-Kbps DS0 blocks you can configure is 1 and the maximum is 24.

Usually, you configure loopback statements at the controller level for all IQ-based channelized interfaces. One exception for channelized T1 IQ interfaces is that you must configure a payload loopback on a T1 IQ interface instead of the controller-level channelized T1 IQ interface. To configure, include the payload option at the [edit interfaces t1-fpc/pic/port t1-options loopback] hierarchy level.

Router A—NxDS0 Method



[edit]
interfaces {


ct1-2/3/7 {
partition 1 timeslots 10 interface-type ds; # Creates NxDS0 channel ds-2/3/7:1.
partition 2 timeslots 1-9 interface-type ds; # Creates
a channel group with
}              #
9 NxDS0s.




ds-2/3/7:1 {


unit 0 {


family inet {
address 10.25.1.2/24;
}


}


}




ds-2/3/7:2 {


unit 0 {


family inet {
address 10.25.2.2/24;
}


}


}


}

Router A—Fractional T1 Method



[edit]
interfaces {


ct1-2/3/8 {
no-partition interface-type t1; # This creates a single
T1 channel: t1-2/3/8.
}




t1-2/3/8 {


t1-options {
timeslots 1-2; # This statement enables only 2 of the 24 NxDS0 time slots
}             #
available on t1-2/3/8.




unit 0 {


family inet {
address 10.255.126.2/24;
}


}


}


}

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