To the IS 640-18 may be connected:
A maximum of 6 intercom channels,
coming from for instance a 6-channel
power supply (PS 680) or a 6-channel
master speaker station (PS 6379 Mk2).
A maximum of 18 intercom lines. To each
intercom line one or several user stations
may be connected.
Each intercom line may be assigned to one of the
6 intercom channels, using 6-position slide
switches.
The cabling of intercom lines and intercom
channels is standard microphone cable.
The IS 640-18 is a 19” unit, taking 1U of rack
space.
Each slide switch assigns the audio wire of each
intercom line (labeled 1 –18) to the audio wire of
one of the 6 intercom channels (labeled A –F).
The intercom channels and the intercom lines are
connected to the rear panel.
The connection points are small terminal strips
(see detail in drawing) which are labeled A - F for
the intercom channels and 1 –18 for the
intercom lines. To each terminal strip the two
conductors and the shield of each microphone
cable can be connected.
The 6 intercom channels can be extended to a
next IS 640-18 or IS 640-12 unit.
The ‘through” intercom channels have to be
connected to the second set of connection points
A –F.
Another way of extending the intercom channels
is to use the ‘intercom channel link option’ (see
drawing). It concerns 2 sets of connection points,
shaped for flat cables (1/10” pitch), allowing to
link the intercom channels to one or several IS
640-18 units. This in case these units are
mounted above each other. See drawing on next
page.
