TELOS TWOX12 USER’S MANUAL
ISDN BRI ORDERING GUIDE FOR USA & CANADA
APPENDIX 7 206
COMPANY TELEPHONE NUMBER WORLDWIDE WEB
Ameritech 800-TEAMDATA (800-832-6328) www.ameritech.com
Bell Atlantic 800-570-ISDN (800-570-4736) www.ba.com
(see below for former NYNEX regions)
Residential 800-204-7332
Bell Atlantic North
Call your account representative. If you do not know who s/he is, call;
(former NYNEX )
800-GET-ISDN (800-438-4736) www.nynex.com
Bell South 800-428-ISDN (800-428-4736) www.bell.bellsouth.com
Cincinnati Bell 513-566-DATA (513-566-3282)
GTE 800-GTE-4WCN (800-483-4926) www.gte.com
Natco 800-775-6682 ext 288
Nevada Bell Small Business 702-333-4811
Large business 702-688-7100
Pacific Bell 800-4PB-ISDN (800-472-4736) www.pacbell.com
Rochester Tel 716-777-4501 or 1234
SNET 800-430-4736 www.ntplx.net
Stentor (Canada) 800-578-4736 (Fax server, document 200 has a list of local numbers)
For questions or assistance call 403-945-8130
Southwestern Bell 800-SWB-ISDN (800-792-4736) www.sbc.com
US West 800-728-4949 (Fax server) www.uswest.com
small business 800-246-5226
For questions or assistance 206-447-4029
Details, Details
In order to communicate accurately what it is you need, we think you should be familiar with
the vocabulary used to describe ISDN. As with anything, for best results, it helps to know
what you are talking about. For an in-depth glossary of terminology please check Appendix 4
or Telos’ web site at http://www.telos-systems.com .
Protocols
In a perfect world, all ISDN terminal equipment would work with all ISDN lines, without
regard for such arcana as 5ESS, DMS100, CSV/CSD, SPIDs, etc. Unfortunately, the ISDN
“standard” has been evolving for the past years and has only recently begun to settle down.
At their central offices, the telephone companies use either AT&T/Lucent 5ESS, Northern
Telecom DMS100, or Siemens EWSD switching equipment. While each will work with the
TWOx12, there are some differences which need to be taken into account when lines are
ordered and used. Each has a “protocol” – the language the user equipment and the telephone
network use to converse (on the D channel) for setting up calls and the like.
There is a standard protocol which all switches may provide, called National ISDN 1 (NI-1).
This protocol was standardized and specified by Bellcore, the technical lab jointly owned by
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