Nortel Networks Modular ICS 4.0 - Manual (Page 165)

P0881591 Issue 01 Modular ICS 4.0 System Coordinator Guide
ISDN PRI and BRI
Integrated Services Digital Network (ISDN) technology
provides a fast, accurate and reliable means of sending and
receiving data, image text and voice information through the
telephone system.
By using Primary Rate Interface (PRI) or Basic Rate Interface
(BRI), your ISDN service allows for faster transmission
speeds and the addition of a variety of powerful business
applications, including remote LAN access,
videoconferencing, file transfer and Internet access.
Your installer configures your ISDN services and terminal
equipment.
ISDN PRI
PRI is economical because separate analog trunks and data
circuits are not needed for Direct Inward Dialing (DID), Direct
Outward Dialing (DOD) and data transfer.
With PRI there is greater flexibility because B channels can be
dynamically reconfigured to accommodate changes in traffic
with the Call by Call feature. For more information see “Call
by Call service selection for PRI” on page 156.
PRI offers fast information access because channel usage is
optimized to allow you the full benefit of available bandwidth
and real-time connectivity.
PRI lines are configured as DID lines. Incoming calls on a PRI
line can appear on a DID button or on an intercom button
depending on how your Norstar set has been configured.
Outgoing calls are made from the intercom buttons.
p0881591.book Page 153 Wednesday, August 19, 1998 6:43 PM