User guide

August 2001 99
Understanding E1 Trunks
Timeslot 16
Timeslot 16 of each frame carries the A, B, C, and D signaling
bits for each of the 30 data channels. These bits carry
information about the line, such as on hook or off hook status.
The first four bits of timeslot 16 carry signaling bits for one
channel, n, and the second four bits carry signaling bits for
channel n + 15. For example, timeslot 16 of frame 1 carries
signaling bits for channels 0 and 15 (Timeslots 1 and 17
respectively).
Table 19 shows the frame number and the two channels for
which that timeslot carries signaling bits.
Table 19. Timeslot 16 Signaling Bits in a CEPT Multiframe
Frame Data Channel n Data Channel n+15
0 Reserved Reserved
1 0 (TS 1) 15 (TS 17)
2 1 (TS 2) 16 (TS 18)
3 2 (TS 4) 17 (TS 19)
4 3 (TS) 18 (TS 20)
5 4 (TS 5) 19 (TS 21)
6 5 (TS 6) 20 (TS 22)
7 6 (TS 7) 21 (TS 23)
8 7 (TS 8) 22 (TS 24)
9 8 (TS 9) 23 (TS 25)
10 9 (TS 10) 24 (TS 26)
11 10 (TS 11) 25 (TS 27)
12 11 (TS 12) 26 (TS 28)
13 12 (TS 13) 27 (TS 29)
14 13 (TS 14) 28 (TS 30)
15 14 (TS 15) 29 (TS 31)