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JUNOSe 11.1.x Physical Layer Configuration Guide
T1 Channels
A T3 line consists of 28 T1 channels (or data streams). A T1 channel is identified by
its number in the range 1–28.
Each T1 channel is an aggregate of 24 DS0 timeslots, as shown in Figure 2 on page 8.
To configure an entire T1 line, assign 24 timeslots to each channel.
Figure 2: T1 Channels and DS0 Timeslots on a T3 Line
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
4 on page 8.
Table 4: Sample T1 Subchannel/Timeslot Assignments
To configure the subchannels listed in Table 4 on page 8, use the following command
to specify the T3 controller in chassis slot 0, port 1.
8
Platform Considerations
Subchannel
1
2
3
4
5
6
host1(config)#controller t3 0/1
DS0 Timeslot
1–4, 10, 22–24
5–6
7–9
11
12–15, 20–21
16–19
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