C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Page 4-6 Publication No. 150-041118
Section 4 – Electrical Installation Rev A
Sep 2001
(15) Aux Audio IN HI (Pin 27)
This port provides an auxiliary input to the headset audio amplifiers (primary and
secondary). It is not switched and all inputs to this port will appear at the headset(s).
Typical use is alert tones, progress tones, medical telemetry equipment like Doppler
Monitors, etc. Typical input level of 0.5 Vrms (5k Ohm) will yield standard audio although
A2R102 on the system interface board provides an adjustment range of 0.33 to 7.75
Vrms.
(16) Plain/Cipher Select (Pin 35)
This output provides control signals to external equipment for activating encryption
equipment. For normal operation, this output is an open circuit. An active pull to ground is
provided for encryption active.
(17) Cipher/Plain Select (Pin 12)
This output is similar to Plain/Cipher, but is opposite polarity and provides a ground for
normal operation.
(18) Receiving External Encrypted Text (Pin 38)
This input, when grounded, indicates to the C-5000 computer that the external encryption
equipment at the system interface is receiving properly decoded and encrypted text.
(19) Transmitting External Encrypted Text (Pin 19)
When grounded, this input indicates to the C-5000 computer that the external encryption
equipment is active and is providing cipher text for wideband modulation to the crew
selected transmitter.
(20) PTT To Cipher (Pin 56)
This pin provides a ground to repeat the mic input (primary only).
(21) PTT From External Cipher (Pin 15)
When grounded, this pin will cause the C-5000 to remain in transmit mode. Transmitter
end of text messages can be transmitted after mic PTT has been released by utilizing this
input as a stretched or delayed PTT input.
(22) Zeroize (Pin 26)
This pin provides an output from the C-5000 to external encryption (internal as well)
equipment to erase key variables. This output is configured as standard to provide an
open circuit under normal operation and provide 27.5 Vdc to Zeroize key variables in
encryption equipment. By changing A2JP8 on the system interface board from "l to 2" to
"2 to 3", the output provides an active ground for Zeroizing (open circuit = normal).
To Next Page
Loading...
Need help?
General
