Example: Channelized T1 IQ Interface Configuration
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-2/3/7:2.
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;
}
}
}
}