APPENDIX 11-11
From the perspective of the telephone network, each channel appears to be a separate
line with its own number and independent dial-out capabilities. Since each has to be di-
aled or answered separately, they appear to be “lines” to users also. We refer to a B chan-
nel as a “line” on ZephyrExpress menus.
ZephyrExpress’ internal interface (sometimes called by its generic name “Terminal
Adapter”) is used to connect to digital ISDN telephone lines. It easily adapts to the various
types of service offered by the range of Central Office (CO) switches installed by tele-
phone companies in the USA and Canada.
Ordering ISDN

Dealing with the Phone Company

As is often the case when broadcasters interface with phone people, the lines of com-
munication on ISDN can get a little tangled.
The first order of business is to find someone who knows what ISDN is. While your
usual account agent will be the normal entry point, you will probably be talking to a
number of phone people before you find one who understands your needs.
Some of the regional Bell companies offer a single point of contact number for switched
digital services. Note that in many cases the phone company will need to do a “loop
qualification” (line loss test) from your site before they can verify that ISDN will be avail-
able. Some telephone companies use “resellers”. If this is the case you should inquire
what experience this reseller has with installing ISDN for audio codecs.
Here are some contact numbers we use – if you have particularly positive or negative ex-
periences with these offices, please let us know.
COMPANY TELEPHONE NUMBER WORLDWIDE WEB
Ameritech 800-TEAMDATA (800-832-6328) http://www.ameritech.com
Bell Atlantic Business 800-570-ISDN (800-570-4736) http://www.ba.com
Residential 800-204-7332
Bell Atlantic areas that were formerly Nynex, call your account rep or:
800-GET-ISDN (800-428-4736) http://www.bell-atl.com
Bell South 800-428-ISDN (800-428-4736) http://www.bell.bellsouth.com
Cincinnati Bell 513-566-DATA (513-566-3282)
GTE 800-GTE-4WCN (800-483-4926) http://www.gte.com
Natco 800-775-6682 ext 288
Nevada Bell Small Business 702-333-4811;
large business 702-688-7100
Nynex (see Bell Atlantic)