Telos ZephyrExpress user manual Ordering Central Office Switches and Protocols1

will work with ZephyrExpress, the differences need to be taken into account when lines are ordered and the equipment set up.

In the USA, telephone companies use either AT&T 5ESS, Northern Telecom DMS100, or Siemens EWSD switches. Each of these can support the National ISDN 1 (NI-1) protocol standard, which has been 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 pre-date the NI-1 standard and some switches have not been upgraded to the new format.

In Europe, the common standard is Euro-ISDN, following the ETS300 documents. It is

?an (apparently successful!) attempt for all of the European telephone networks to use a single, compatible protocol. The Telco authorities in most countries have adopted it al- ready, with most of the rest planning to do so.CURIOSITY NOTE!There are also newer NI-2 and NI-97 standards, but they are designed to be compati-

ble with NI-1 for all of the basic functions.

ZephyrExpress supports all of these with the appropriate selection of the ISDN: Switch type menu, as follows:

∙ PTP AT&T Point-to-Point Custom.

∙Natl I-1NI-1 from all switches; Northern Telecom “Functional” custom.

∙ETS300 “Euro-ISDN”, ETS300 pan-European protocol.

In the USA, if you have a choice, the AT&T custom PTP protocol is often preferred be- cause you don't have to trouble with the SPIDs.

Ordering: Central Office Switches and Protocols1

Here are detailed descriptions of what you tell the phone company you want and the cor- responding ZephyrExpress settings for each of the protocols.

National ISDN-1 (USA and Canada)

Available on AT&T 5ESS, Northern Telecom DMS100, and Siemens EWSD switches which have newer generation software.

If the Telco uses IOC Capability Packages, specify Capability Package “S”.

If they do not use IOCs, use the information that follows:

CO VALUES (TO TELL THE PHONE COMPANY)

Line Type: National ISDN-1

Bearer Service: CSD and/or CSV as desired (see above)

TEI: One dynamic per channel

1This information is also included in our handy ISDN Order Form, in the appendix.

7-10 ISDN