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The BR4 card is a plug in adapter card suitable for use in many different types of IBM PC/AT
compatible computer, and provides a means of connection between the telephone network and
various kinds of PC based speech and data products from different vendors.
Examples of cards that may be used with the BR4 card are single or multi channel:-
Speech recognition cards
Speech processing cards
FAX cards
Data Communications cards.
The use of the BR4 card along with such products allow the integration of a number of different
types of automatic and semi-automatic telephone and telecomm based services.
The BR4 card provides an MVIP bus (Multi-Vendor Integration Protocol) and a PEB/SCBus
(PCM Expansion Buses), that allow it's use with a very wide range of third-party products. It
contains a 380x380 digital cross-point switch that allows arbitrarily switched interconnection
between the 8 calls on the network, 256 speech paths on the MVIP bus, and the 32 speech paths
on the PEB or SCBus .
Control of the BR4 card is via a low-level interface ported to the PC bus itself, thus the card is
essentially operating system independent, and may be used in a DOS, OS/2, UNIX, Windows
NT or indeed any other operating system environment, through the use of a suitable device
driver.

Network/Equipment Attachment
The BR4 card attaches to the 2B+D (2x64Kbit + 16Kbit) S/T-Bus Basic Rate Interface (Bri),
Integrated Services Digital Network (ISDN). The BR card has four ports available for connection
to the network or terminal equipment, with each port able to make or receive 2 calls and in total
handle 8 calls. The card can operate in two modes: Terminal mode (LTT) or Network mode
(LTS).
In LTT mode (user side) the BR4 card connects via a service provision often used to connect
digital terminal equipment for example ISDN Telephones to the public/private telephone
network.
In LTS mode (network side) the BR4 card can provide the network side interface, that can be
used to connect Basic Rate terminal adapters such as ISDN Telephones.

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