Telos ZephyrExpress user manual IOC Capability Packages, Protocols

Pacific Bell	800-4PB-ISDN (800-472-4736)	http://www.pacbell.com
	For questions or assistance 403-944-8130
SNET	800-420-4736	http://www.ntplx.net

Stentor (Canada) Fax server 800-578-4736, document #200 has list of local ordering numbers. 403-944-8130 (questions/assistance).

Southwestern Bell	800SWB-ISDN (800-792-4736)	http://www.sbc.com
US West	Fax server 800-728-4949	http://www.uswest.com
	Small business 800-246-5226
	For questions or assistance 206-447-4029

*You may need to call this number more than once to find someone who can arrange for fast installation for remotes. Be sure to explain that you are a broadcaster.

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 see manual appendix or visit Telos System’s web site at http://www.zephyr.com

IOC Capability Packages

More and more telcos are using ISDNOrdering Code (IOC) capability packages for ISDN ordering. If your telephone company uses these you need only tell them you need IOC package “S”.

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. Unfortu- nately, 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 5ESS, Northern Tele- com DMS100, or Siemens EWSD switching equipment. While each will work with ZephyrExpress, 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 the phone companies. However, both AT&T and Northern Telecom had “custom” versions of ISDN which predated the NI-1 standard and some switches have not been upgraded to the new format.

There is also a newer NI-2 and NI-97 standards, but they are designed to be compatible with NI-1 for all of the basic functions.

11-12 APPENDIX