TB9100/P25 CG/P25 TAG Installation and Operation Manual Technical Description 137
© Tait Limited March 2014
Power and Ground
The PMU provides power to the control panel via the reciter. The reciter
has a series diode to ‘diode OR’ the power to the control panel, but not to
backpower a reciter that does not have a power cable connected.
Pin Allocations The subrack interconnect board at the front of the subrack provides a parallel
interconnection between all connectors on the board.
The following table gives the pin allocations for the IDC connectors to the
reciter, PA and PMU, and for the D-range connector to the control panel.
Signal
Reciter, PA & PMU
IDC Pin
Control Panel
D-range Pin
I
2
C interrupt (not used) 1 8
I
2
C data 2 15
ground (I
2
C) 3 no connection
I
2
C clock 4 7
+28V (control panel power) 5 14
RS-232 Tx data 6 6
ground (control panel power) 7 13
RS-232 Rx data 8 5
ground (analog) 9 12
control panel speaker 10 4
control panel microphone 11 11
alternative PA key (not used) 12 3
+24V switched (PA fan) 13 2
ground (PA fan) 14 10
+24V switched (PMU fan) 15 9
ground (PMU fan) 16 1
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