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8-8 Dialable Wideband Service
Channel selection sequence
The DMS-250 switch uses either of two algorithms to search for idle trunks
on which to route wideband calls:
T1 list
When selecting channels for routing, the DMS-250 switch considers a trunk
group connecting two switches as a list of T1s with trunk members in each
T1. The switch adds a T1 to the list when its first channel is available.
Figure 8-5 shows the T1 list.
297-2521-106 Standard 23.01 March 2001
Flexible allocation—a selection option of 2–24 DS-0s on a T1 span
wideband bestfit ascending sequence (ASEQ)—starts the channel search
at the top of the T1 list (lowest DS-0 number to highest DS-0 number),
as shown in Figure 8-5
wideband bestfit descending sequence (DSEQ)—starts the channel
search at the bottom of the T1 list (highest DS-0 number to lowest DS-0
number), as shown in Figure 8-5
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