Bay Networks 6300 Ordering Manual

Primary Rate ISDN

Service Options

Ordering Primary Rate ISDN for the
T
his guide tells you how to order Primary Rate ISDN (PRI) lines for
use with the Remote Annex 6300 PRI module in the USA and Canada
only. For the most up-to-date version of this document, please see the
Bay Networks World Wide Web site at http://www.baynetworks.com.
In North America, Primary Rate ISDN is provided over the same physical
circuit as a T1 leased line, from what is known as the 'trunk side' of your
telephone company's central office switch. The main difference between
a T1 and a PRI line lies in how a PRI line is split up into 23 B (or 'bearer')
channels plus one D ('delta' or signaling) channel, and in how calls are
set up and controlled. As with Basic Rate ISDN, the B channels each have
a 64 kpbs capacity. Unlike Basic Rate ISDN, however, the D channel also
has a 64 kbps capacity, rather than 16 kpbs.
This edition of the guide covers product versions which require an
external Channel Service Unit (CSU). A CSU is a device that provides
electrical isolation between the telephone company's line and your
equipment, along with remote diagnostic capabilities so that the phone
company can test the line. An External CSU is bundled with Remote
Annex shipments for the U.S. and Canada. Follow the installation
instruction included with the CSU.
You should be aware that both local and long distance phone companies
can provide PRI services, but that exact service options may differ
between them. Contact your carriers for more details. For North America,
the Remote Annex 6300 supports 5ESS, DMS100 and NI-2 switches.
Remote Annex 6300
166-024-850 Rev. A 1