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Example: Channelized DS3 IQ Interface Configuration

Figure 6: Channelized DS3 IQ Interface Example

Image g003028.gif

This example shows how to configure a channelized DS3 IQ interface. Figure 6 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



[edit]
interfaces {


ct3-0/0/1 { # This is the controller level for the channelized
DS3 IQ interface.
partition 1 interface-type t1; # This creates the t1-0/0/1:1
channel.
partition 2 interface-type ct1; # This creates the ct1-0/0/1:2
channel.
partition 3-10 interface-type t1; # This creates channels
t1-0/0/1:3 through :10.
partition 11-28 interface-type ct1; # This creates channels
ct1-0/0/1:11 to :28.
}




t1-0/0/1:1 {
...
}




ct1-0/0/1:2 {
partition 1 timeslots 1-10 interface-type ds; # These statements
create
partition 2 timeslots 11-20 interface-type ds; # three
channel groups.
partition 3 timeslots 21-24 interface-type ds;
}




ds-0/0/1:2:1 { # This channel group contains 10 NxDS0s.


unit 0 {


family inet {
address 10.25.1.2/24;
}


}


}




ds-0/0/1:2:2 { # This channel group contains 10 NxDS0s.


unit 0 {


family inet {
address 10.25.2.2/24;
}


}


}




ds-0/0/1:2:3 { # This channel group contains 4 NxDS0s.


unit 0 {


family inet {
address 10.25.3.2/24;
}


}


}




t1-0/0/1:3 {
...
}




t1-0/0/1:10 {
...
}




ct1-0/0/1:11 {
...
}




ct1-0/0/1:28 {
...
}


}

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