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Specifications
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Basic Rate U Interface (BRU) Card
Basic Rate U Interface (BRU) Card
NOTE: BRU cards are not supported in Europe.
4.217 The Basic Rate U Interface card (BRU) allows the system to connect to North Ameri-
can ISDN basic rate trunks via U interface. The card supports eight ports. Each port consists of
two bearer channels (B-channels), each operating at a rate of 64,000 bits per second, and one
data channel (D-channel) operating at a rate of 16,000 bits per second.
4.218 BRU station ports can be connected to a data device (e.g., ISDN Modem or ISDN LAN
Bridge), a video device (e.g., video conference unit), or an ISDN phone via U interface. BRU
trunk ports can be connected to the central office via U interface. Note that each port has a
built-in Network Terminator Type 1 (NT1) device allowing the port to be connected directly to
the CO line. Most BRU station devices, such as video conference units, come with an S inter-
face. However, some BRU station devices, such as ISDN modems, may have a built-in NT1
device and must be connected directly with a BRI station port (U interface).
Figure 2-6. Sample BRU Installation
NOTE: All the BRI station ports, shown above, are U interface with a built-in NT1.
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