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MultiModemISI Hybrid Series, ISIHI-2S 143
Appendix
8. Request the telephone company to provide ISDN TA configuring information (record
here):
• ISDN Switch Type: ____________________
• ISDN Switch Protocol Version: ___________
• ISDN Phone Number 1: ________________
• ISDN Phone Number 2: ________________ (if 2B+D ordered)
• ISDN Line Type: ______________________ (point-to-point or multipoint)
• If MultiPoint, SPID Number 1:____________ (with prefix and suffix)
• If MultiPoint, SPID Number 2:____________ (with prefix and suffix)
9. If you use standard 5ESS or DMS-100, your protocol selection is complete. Fax the
information in steps 1-8 to your phone company. If you use 5ESS
Custom
or DMS-
100
Pvc1
protocol support, continue with 5ESS Custom or DMS-100 Pvc1 below.
5ESS Custom Line Additional Parameters
The AT&T 5ESS central office telephone switch supports a proprietary ISDN D-
channel call control protocol called
Custom,
based on CCITT recommendations. The
ISDN TA configured for switch type AT&T 5ESS works with lines providing this
protocol on 5ESS switches with software version 5E6 or later.
The ISDN TA supports the following configurations on 5ESS Custom lines:
• Point-to-Point with one phone number (recommended configuration with no
POTS interface)
• Multipoint with one phone number
• Multipoint with two phone numbers (recommended configuration with POTS
interface)
The requirements for the 5ESS line are shown below:
B1 Service: DMD (On-demand)
B2 Service: DMD (On-demand)
Data Class Line: PM (Point-to-MultiPoint)
Max. B Channels: 2
Number of CSV Calls: 2
CSV Bearer Channels: Any
Number of CSD Calls: 2
Circuit Switched: Any
Terminal Type Bearer Channels: Type A
Multipoint lines require the phone company to create a SPID for each phone number
on the line. Except for the ability to spread two calls across two phone numbers,
multipoint lines offer no special features and may create complications. However, if
you use a multipoint line, the parameters are similar to the point-to-point lines, except
for the SPIDs.