17
Rules for installing the sound system
As regards the number of devices that can be used on the branches of the speaker system the following restric-
tions apply:
Description Number Notes
Maximum No. of inputs (transmitters) 4 4 stereo channels
Maximum No. of “audio” devices
(inputs, outputs, accessories)
64
Limit fixed by the input impedance of
the “audio” nodes
No. of receivers not powered by Bus
64 – no. of inputs – no. of accessories
(shunts, decouplers, etc).
Total: max 64 devices (transmitters,
receivers, accessories). Each receiver
can choose the audio channel from the
4 available ones
No. of receivers powered by Bus
20581, 19581, 14581
A receiver powered via Bus consumes
as much as 15 By-me devices (for
example, max 4 devices per power
supply unit with power supply unit
01801)
The limits of the power supply units
apply:
01401 = 1280 mA
01801 = 800 mA
01400 = 400 mA
No. of decouplers 01902 2
Given the strong attenuation of the
signal due to the shunts, it is necessary
to make sure that the path between
a transmitter and a receiver does not
pass more than 2 of them
Max. No. of microphone modules
20586, 19586, 14586
8
Possibility of making up to 8 different
selective calls
No. of By-me shunts 01903 64
Each shunt enables shunting a By-me
branch beginning from the “audio”
branch
No. of By-me devices that can be con
-
nected to the By-me shunt 01903
10
In each shunt created by the decoupler
I can connect max 10 By-me devices
Maximum no. of branch shunts 01904 2
The shunt 01904 is used for shunt
-
ing two new audio branches from a
speaker system line, making it possible
to create a star connection
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