Mitel SX-2000 - Manual (Page 44)

SX-200 General Information Guide
30 Revision A 50003510
ISDN Support
The Integrated Services Digital Network (ISDN), transmitting voice, data and video at high
speeds, accurately and without a modem, has revolutionised communications. ISDN services
can be deployed and accessed at enterprise, department and desktop levels by its simple
addition to your existing SX-200 network. ISDN proves its worth by its ability to carry voice,
data and video imaging on one network.
ISDN standards define two types of ISDN interface. Basic rate interface (BRI) is defined as
2B+D: two 64 kbs B channels and one 16 kbs D channel. T1 ISDN Primary rate interface (PRI)
is defined as 23B+D: 23 64 kbs B channels and one 16 kbs D channel. The B channels carry
voice or data, and the D channel provides the signaling channel.
Basic Rate Interface Card
BRI is typically used for video conferencing and providing access to inexpensive digital trunking
for small sites. BRI software supports National ISDN 1 (NI-1) and NI-2 basic call and incoming
calling name delivery. On the trunk side, BRI software supports an access point for video
conferencing and Group 4 fax. It also supports internet access for PC data terminals, and it
can provide a voice alternative to analog lines for small systems. On the line side, BRI software
supports the requirements for hosting a videoconference unit, a Group 4 fax unit, or a PC with
a BRI interface. One common line-side BRI application is hosting an Xpress Office Teleworker
(5232i) for remote DNIC operation either directly, or through a PRI channel.