Nortel DMS-250 - Datafill for Channel Selection

8-10 Dialable Wideband Service
297-2521-106 Standard 23.01 March 2001
•
firstfit—searches for the first available idle channels that fulfill the
requirements of the wideband call; this option minimizes the possibility
of glare.
Datafill for channel selection
Tables TRKMEM and TRKGRP establish the protocol, circuit requirements,
and trunks for DWS. The combination of these assignments determine the
type of circuit used for the wideband call. A call can come in on a trunk
defined as one protocol and go out on a trunk defined as another protocol.
The method of channel selection is defined in Table TRKGRP. The SELSEQ
field must first be set to WIDEBAND. When the SELSEQ field is set to
WIDEBAND, the three SELSEQ subfields must also be defined. These are
shown in Figure 8-6.
• WBSELSEQ (WideBand SELection SEQuence)—identifies the ASEQ
or DSEQ selection algorithm
• WBGRPING (WideBand GrouPING)—identifies the grouping of the
wideband channels as fixed, floating, or flexible
• WBSEARCH (WideBand SEARCH)—identifies the type of search
through the T1 list as bestfit or firstfit
Figure 8-6
Table TRKGRP SELSEQ field and subfields
WB
PRA250
0
NPDGP
NCIT
MWC
0
4
64KDATA
WIDEBAND
ASEQ
FIXED
BESTFIT
NIL
0
312
0
ISDN 45
WBS 6 6
IMT $
CLLI
GRPTYP
TRAFSNO
PADGRP
NCCLS
CUSTOMER
ZONE
FASTIDGT
BCNAME
SELSEQ
WBSELSEQ
WBGRPING
WBSEARCH
TRAFCLS
TIMEBIAS
SNPA
IEXCLINX
LTID
OPTIONS
OPTIONS
TRKGRP
element
H0 service
These elements together
define the method of
channel selection.