FLEXCOMM
II
C-5000 (Non-Digital)
Installation Manual
150-1355-000 Rev. M
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 66
Pin(s) - Signal Name (Continued)
43, 44 - 27.5 VDC A/C Power and A/C Power Ground
These pins provide aircraft 27.5 Vdc power to the C-5000 system. Typical loading
is approximately 350 mA, however with external loading by auxiliary equipment
connected to ±15 V and +5 V pins provided, the current requirement can be 1.3
Amp at 27.5 Vdc and approach 2 Amps at low voltage. Appropriate circuit
breaker should be provided with consideration given to separately powered radio
equipment as part of the basic communications equipment being controlled by
the C-5000.
50, 8, 30 - 28V, 5V, COMMON LITES
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.
2, 45, 46, 47, 24, 25 - RS-422 TX HI/LO, RS-422 RX1 HI/LO, RS-422 RX2 HI/LO
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.
5, 6, 55 - INTERNAL CIPHER SEL A, B, C
Unavailable function.
14 - INTERNAL CIPHER DISABLE
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
