C-5000 COMMUNICATION MANAGEMENT CONTROLLER
INSTALLATION MANUAL
Publication No. 150-041118 Page 4-5
Rev A Section 4 –Electrical Installation
Sep 2001
(9) 28V, 5V, Common Lites (Pins 8, 30, 50)
These pins provide for aircraft lite dimmer bus control of the keyboard lighting. Either
28 Vdc, 5 Vrms or 5 Vdc lighting may be used. The C-5000 does not draw power from
the buss but simply monitors the voltage for proper lite tracking. Only 5 V or 28 V may be
connected at once.
(10) RS-422 TX, RS-422 RX1, RS-422 RX2 HI/LO (Pins 2, 24, 25, 45, 46, 47)
These pins provide for a bi-directional digital data buss to other equipment on board the
aircraft. Two separate receive inputs are provided and the transmit pair may be
connected to multiple RS-422 devices. The receive shields should be connected only at
the originating equipment and the transmit shield should only be connected to the C-5000
shield pin.
(11) Internal Cipher Select A, B, C (Pins 5, 6, 55)
These pins are normally left unterminated and Internal Cipher Selection is managed from
the C-5000. Alternately, pins A, B, and C may be grounded in a binary fashion to provide
external selection of 1 of 7 internal cipher modes.
(12) Internal Cipher Disable (Pin 14)
This pin, when left unterminated, causes audio routing within the C-5000 to include the
Internal Cipher Interface. By grounding this pin, audio routing of the following signals is
to/from the external system interface for utilization with External Encryption Equipment,
auxiliary systems and functions generally used in conjunction with military equipment.
Associated signals routed to the External Interface are:
Mic output, voice band transmit audio input, wideband transmit audio input, wideband
receive audio output, voice band receiver audio output, decoded/de-encrypted voice
band received audio input, guard receiver voice band audio output.
This pin should normally be grounded unless an Internal Cipher module (or other special
module) is installed in the C-5000 and then it should be switched for Internal or External
routing of the "RT-X" signals.
(13) External Cipher Active (Pin 36)
This pin, when grounded, indicates to the C-5000 computer that external encryption
equipment connected to the system interface card is active and activated by external
control.
(14) XMT Audio IN HI/COMMON (Pins 3, 4)
This pair provides a voice band input to the transmitter(s) as selected by the crew.
Typical use is with external encryption equipment in which the mic input to the C-5000 is
routed out to the encryption unit and when the encryption unit is not active, the mic input
(voice band) is returned to this port for normal voice transmit. Standard levels are 0.9
Vrms into 600 Ω, although A2R160 and A2JP3 provide adjustment range of
approximately 40 mV (150 Ω) to 5.4 V (600Ω).
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