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Fractional T1

Fractional T1 is a portion of a T1 line. To configure fractional T1 on a channelized T3 interface, you assign a range of DS0 timeslots to a T1 channel and subchannel. A subchannel is group of timeslots. Subchannel numbers range from 1–24 and do not necessarily correspond to DS0 timeslots. The subchannel number identifies a fractional T1 channel.

For example, you might make the assignments for subchannels 1–6 as listed in Table 5.

Table 5: Sample T1 Subchannel/Timeslot Assignments

Subchannel	DS0 Timeslot
1	1–4, 10, 22–24
2	5–6
3	7–9
4	11
5	12–15, 20–21
6	16–19

To configure the subchannels listed in Table 5, use the following command to specify the T3 controller in chassis slot 0, port 1.



host1(config)#controller t3 0/1

Then assign the timeslots to channel 1, subchannel 1.



host1(config-controll)#t1 1/1 timeslots 1-4,10,22-24 

host1(config-controll)#t1 1/2 timeslots 5-6 

host1(config-controll)#t1 1/3 timeslots 7-9 

host1(config-controll)#t1 1/4 timeslots 11 

host1(config-controll)#t1 1/5 timeslots 12-15,20-21 

host1(config-controll)#t1 1/6 timeslots 16-19

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