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Configuring Payload Loopback

Clocking and loopback options are configured at the controller level for all IQ-based and IQE-based interfaces. However, for the channelized T1 IQ interfaces, configure the payload loopback on the T1 interfaces instead of the channelized T1 IQ interface. To configure the payload option, include the payload statement at the [edit interfaces t1-fpc/pic/port t1-options loopback] hierarchy level.

By default, all the time slots on a channelized T1 IQ interface are used. There can be a maximum of 24 channel groups per channelized T1 IQ interface. Thus, you can configure a maximum of 240 channel groups per PIC.

To specify the DS0 channel group number in the interface name, include a colon (:) as a separator. For example, a Channelized T1 IQ PIC might have the following physical and virtual interfaces:



ds-0/0/0:x

x is a DS0 channel group from 1 through 24 (for more information about ranges, see Table 42).

You can use any of the values within the range available for x; you do not have to configure the links sequentially. In addition, the JUNOS software applies the interface options you configure according to the following rules:

To configure the t1-options statement, you must set channel group x to 0:ds-0/0/0:0
There are no restrictions on configuring the ds0-options statement.
If you delete a configuration you previously committed for channel group 0, the options return to default values.

To configure the channel groups and time slots for a channelized T1 IQ interface, include the following statements at the [edit chassis] hierarchy level:



[edit chassis]
fpc slot-number {


pic pic-number {


ct1 {


t1 link-number  {
channel-group group-number;
timeslots time-slot-range;
}


}


}


}

There are 24 time slots on a T1 interface. You can designate any combination of time slots. To configure ranges, use hyphens. To configure discontinuous time slots, use commas. Do not include spaces.

Table 42 shows the ranges you can specify.

Table 42: Ranges for Channelized T1 IQ Configuration

Item	Option	Range
FPC slot	slot-number	0 through 7
PIC slot	pic-number	0 through 3
T1 port	port-number	0 through 9
DS0 channel group	partition	1 through 24
Time slot	time-slot-range	1 through 24

The theoretical maximum number of channel groups possible per PIC is 10 * 24 = 240. This is within the maximum bandwidth available.

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