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C H A P T E R
3
C O N F I G U R I N G
V 1 0 0
MODE
The BRI Extender card fundamentally operates in one of two modes; either as a terminal device (TE),
when it should be connected to an ISDN network, or as a network device (NT) when a terminal device
should be plugged in to the card. The QSIG variants of each mode allow the cards to be connected to
ISDN trunk lines on a digital PBX.
BEARER
This field allows Bearer1, Bearer2 or both bearers to be enabled for use. A full basic rate ISDN service
would require 137.6Kbps of bandwidth to support but this may be reduced by limiting the number of
bearers.
RX AND TX CLOCK REF
In order to distribute the ISDN clock throughout the V100 network, the ideal configuration would drive
one of the Global Clock busses with the clock from the TE card, by selecting BRI EXT as the GRX SOURCE
in the CLOCKING menu for example. This would then form the clock reference for all tributary channels in
the TE mux, which could then onward link the clock over the satellite link. The recovered satellite clock is
then driven on to the GRX bus of the V100 at the remote end and the BRI Extender card in NT mode uses
this to synthesise a clock for the ISDN network presentation.
ACTIVITY
Users will normally take advantage of the switched nature of calls supported over the BRI Extender Card;
"On Demand" mode allows bearer bandwidth to be allocated only when it is required. The channel may be
forced into permanent operation to guarantee bandwidth at all times; this can be useful if the V100 is
operating many switched services at the same time.
DESTINATION
The destination of the remote channel must be specified.
V100 Versatile Multiplexer Technical Manual Version 2.2
Page 115 of 231
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