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Figure 8-5
Trunk selection sequence
Switch A
DSEQ
Search for descending bestfit
(from highest numbered DS-0
to lowest numbered DS-0)
T1s are not ordered numerically; they are added to the list as they become
available. When a T1 channel is added, the T1 retains its position on the list.
Subsequent additions of T1 channels to the list do not affect its position on
the list. The system deletes a T1 from the list when its last channel is deleted
from Table TRKMEM.
Channel availability selection
The DMS-250 switch can be set to look for either of the following:
bestfit—searches for the smallest block of idle channels that fulfills the
requirements of the wideband call
This search will initially skip over a large block of idle channels in a T1
to find a smaller block on which to route the call. Only when the search
determines that the large block is the smallest available on that T1, will
the call be routed over the large block of channels.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Dialable Wideband Service 8-9
Trunk group connecting
switch A and switch B
1
First
2
T1
.
.
.
23
24
1
Second
2
T1
.
.
.
23
24
.
.
.
1
Last
2
T1
.
.
Search for ascending bestfit
.
(from the lowest numbered DS-0
23
to highest numbered DS-0)
24
Switch B
ASEQ
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