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Appendix F: Ordering ISDN Without IOCs
130
ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D
Long Distance Service
If facilities are available, subscribe to long distance service sup-
porting the bearer capabilities previously listed. Request service
supporting circuit-switched 64 kbps or 56 kbps access. It is rec-
ommended that the same long distance carrier end-to-end
throughout the network to be used.
Deciding What Services to Order
If you are new to ISDN, first obtain the features previously listed.
Refer to the section ISDN Service Ordering Information in this
appendix as a basic guide. It is easier to begin operating on a full
featured line because more options are available. Later, features
not actually used can be deleted.
If all of the previous features are not available, compare the actual
data service requirements with those which are available. A
likely problem is the lack of a clear trunk to provide 64 kbps unre-
stricted data service. A solution is to use to 56 kbps service.
Sometimes voice circuits are suitable for data service at a reduced
bit rate.
5ESS Custom Line Additional Parameters
The AT&T 5ESS central office telephone switch supports a propri-
etary ISDN D-channel call control protocol called Custom which
is based on CCITT recommendations. The ISU 2x64 configured
for switch type AT&T 5ESS will work with lines providing this
protocol on 5ESS switches with software version 5E6 or later.
The ISU 2x64 supports the following configurations on 5ESS cus-
tom lines:
• Point-to-point with one phone number
• Multipoint with one phone number
• Multipoint with two phone numbers (recommended configu-
ration)
The requirements for the 5ESS point-to-point line are defined in
Table F-A.