Dolby Laboratories DP503 D.2.1 Switch Types

D-2
The information the phone company needs to give you is:
The switch type that the ISDN circuits are connecting to at the CO
(Central Office)
and the ISDN phone numbers for each line, and whether the B channels
are 56 or 64 kbps.
D.2.1 Switch Types
Certain switch types (there are only two manufacturers typically encountered in
North America: Northern Telecom and AT&T) require additional parameters to be
defined when setting up the ISDN unit which are called SPID or Service Profile
Identifier. A SPID is part of the prefix or suffix used by the ISDN unit. In addition,
there are situations where only one phone number is given for both B channels. In
this situation, it is still possible to make two separate calls.
Switch types used throughout U.S.
AT&T Switch type 5ESS
Northern Telecom DMS100
If your switch type is an AT&T 5ESS, provide the following information to your
phone company regarding the Ascend ISDN unit:
Parameter Value Notes
Terminal Type A
Number of CSD 2
Number of CSV 1
Number of Call
Appearances 1
Display is Y/N No Note that the value of this field is not relevant
for proper operation of the ISDN unit.
Ringing/Idle Call
Appearances Idle This value is the default for terminal type A.
Auto hold is Y/N No This value is the default for terminal type A.
One touch is Y/N No This value is the default for terminal type A.
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