East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM..., Operation Manual

Page: 27 / 77

166119
8/31/2006 23
an ascending count and finds channel 3 is “hs”. Since there were 68 timeslots unused on Link
B, the channel is reallocated onto Link B (shaded box), now leaving 44 timeslots unused.
Table 5
1 6
-24-
12
12
-96-
24
12
96/24
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
hs hf ls lf
1
8/2
16
32
16/2
8
24
4
3
5
64/4
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
hs hf ls lf
fail
0
236
20
downspeed
LINK A: total user timeslots
remaining free timeslots
LINK B: total user timeslots
remaining free timeslots
12/6
24
18
24/18
12
6
12
12
72/18
In the second step, channel 9 is found to be seeking backup. This channel has a failover rate
of 24 timeslots (i.e., a drop from 38.4Kbps to 9.6Kbps). Since this fits within the 44 timeslots
available, the channel is reallocated onto Link B, leaving 20 timeslots.
Table 6
1 12
-16-
2
2
-48-
8
7
-96-
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
hs hf ls lf
1
-8-
16
32
16/2
8
16
-4-
-3-
5
24
64/4
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
hs hf ls lf
fail
0
236
8
downspeed
LINK A: total user timeslots
remaining free timeslots
LINK B: total user timeslots
remaining free timeslots
6
-24-
12
12
-96-
24
12
8/2
16
32
16/2
8
24
4
3
5
64/4
-12-
24
18
24/18
12
6
12
12
72/18
In the third step, the next high-priority channel seeking backup is channel 15. As in the
previous channel, there is a downspeed to 24 timeslots; but, there are only 20 timeslots
available. At this point the system searches for low-priority channels on Link B to bump and
free up timeslots, needing a minimum of 4 timeslots (24 – 20). Low priority channels are
numbered 2, 11, and 13. Channel 2 is first, and is bumped in order to claim 12 more
timeslots. Then channel 15 is reallocated to Link B, leaving 8 timeslots.