Zhone Technologies 900 - Manual (Page 115)

Data Cards IMACS System Release 5.1.6 5-1
BRI Card Introduction
Chapter 5
BRI Card
5.1 Introduction
This chapter provides installation, configuration, and troubleshooting information for the
Basic Rate Interface (BRI) cards. These cards are labeled as the BRI U*8 (826070), BRI-ST*8
(826270), and BRI-SC U*8 (826171) Cards on their faceplate ejectors.
The BRI U*8 (826070) and BRI-SC U*8 (826171) Cards offer connectivity to sites located
up to 18,000 feet from the integrated access system. This distance is influenced by factors such
as wire gauge, bridge tap, and loading patterns, as described in ANSI T1.601-1992. These
cards have eight “U” interfaces apiece that can carry one BRI, 2B+D-channel. This provides
either two 64 kbps or one 128 kbps bearer channels per interface.
The BRI-ST*8 (826270) Card supports the “S” and “T” interfaces. The connection distances
for this card are largely dependent on the number of devices connected to each port. Provides
TE, NT1 and NT2 emulation. Commonly used to provide remote extension of four-wire BRI
CPE devices from an ISDN PBX. Requires external power connection (-48V DC) if more than
three cards are installed in the system chassis (special cable required).
5.2 BRI Card Descriptions
Figure 5-1 shows the difference between leased and brite circuits. The leased circuit can be
any standard 2B1Q (U interface) NTU device that supports "nailed-up" (one or two
B-channel) connections with no D-channel signaling. The BRITE mode supports switched
connectivity to ISDN-compatible switches and D-channel signaling via either a full DS0 time
slot or multiplexed 4:1 on a single DS0.
For both examples, B-channels carrying voice traffic on the BRI card can be compressed
through the ADPCM card to extend the user resources (see the Conversion section of this
chapter). The only limitation on BRI-U traffic is that the NTUs or NT1s must be located less
than 18,000 feet from the system unit.