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isdnpri.txt
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1994-05-05
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INTEGRATED SERVICES DIGITAL NETWORK - PRIMARY RATE INTERFACE
(ISDN-PRI)
PRODUCT DESCRIPTION:
ISDN-PRIMARY RATE INTERFACE (ISDN-PRI) offers the customer a set of standards
which provides end-to-end digital transmission over a single access line. It
is composed of 23 B channels and one D channel. For this reason, it is often
referred to as 23B&D. The PRI speed is 23 "B" channels at 64 Kbps and one D
channel at 64 Kbps.
Functions of ISDN-PRI Service:
- Provides 23 full-duplex 64 Kbps B-channels and one full-duplex 64 Kbps
D-channel.
- Intended for users with greater capacity requirements.
- Provided over a four-wire T1 circuit between the customer's premises
and the central office.
- Designed to be used in any application where multiple network
connections would be appropriate today, such as a:
- PBX.
- Multiplexer.
- Data switch.
- Any other device capable of controlling large numbers of B
channels.
- Individual channels are switchable. The service provides digital
access to the public telephone network, which then deals with
individual connections dynamically.
- The 23 B-channels could be standard voice calls or a mix of
switched voice, virtual private lines, packet-switched data,
circuit-switched data, or video.
- B-channels can be aggregated to increase bandwidth (when
higher speeds are required).
ISDN-PRI is primarily used to access the central office from a PBX, but can
also be used to connect a multiplexer, LAN or mainframe to the public
switched network.
This technology provides for the dynamic allocation of the individual
channels on a call-by-call or time-of-day basis, reducing the trunking
requirement needed to access the network. Used as a tie line, PRI provides
for feature transparency between like vendor CentraNet/PBXs.
APPLICATIONS:
- Connection of PBX systems to PSTN for voice transmission.
- Connection of cluster controllers to PSTN for data transmission.
- Connection of LANs and hosts.
- Connection of multiplexers to the PSTN.
For more information, call 1-800-483-4927 M-F 8am - 8pm eastern.
All trademarks are the property of their respective owners.
Copyright 1994 GTE Telephone Operations
All rights reserved