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ViewStation EX User Guide
40 www.polycom.com
Figure 2-5 shows the network side of the Quad BRI network
interface module that connects to the ISDN BRI network.
Figure 2-5. Quad BRI Network Interface Module (Network side)
Special Information
Quad BRI/IMUX. The Quad BRI is also called IMUX (for Inverse
Multiplexer). With the Quad BRI, you can connect up to four ISDN
lines to the video conferencing unit. The Quad BRI allows multi-line
ISDN connections to be “muxed” together to create a higher
bandwidth connection to the far-site device. Each ISDN line adds
128 Kbps to the possible operating line.
ISDN Lines. The system can use up to four ISDN lines. Note that the
system only require a single functioning ISDN line to operate, but
speeds greater than 128 Kbps require the use of additional ISDN
lines.
NT-1. If you are not connected to an internal phone system, called a
PBX, you will need to connect the ISDN cables from your system to
the Quad BRI module, to the network termination (NT-1) device,
which is connected to the ISDN wall jack.
For more information about ISDN, refer to the Integrators’ Reference
Manual for ViewStation EX, ViewStation FX, and VS4000.
LED Information. Refer to the BRI Technical Information section of
the Integrators’ Reference Manual for ViewStation EX, ViewStation FX,
and VS4000.