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|  MIL-N-81604C(AS)
Appendix I
Para 30.5.8.1
(cont)
(6) Pulse width:
0.65 sec at the 50%
amplitude points.
b.
Type 2 - Standard GC 875S-1 coaxial cable
(1)
True state (l): +4 volts 1.5 volts
False state (0): 0 volts +0.5, -0.0 volts
Interconnecting cables:
(2)
60 feet maximum
(3)
Rise and fall times (non-clock pulses):
0.15 sec between 10% and 90% amplitudes
with a pulse width of 0.65 sec at the
50% amplitude points.
(4)
Rise and fall times (1.2 MHz 0.1% clock
25 nanoseconds with 100 25
pulses):
nanoseconds pulse width at the 50% ampli-
tude points.
Termination:
Characteristic impedance
(5)
5%, shunt capacitance
100 picofarads.
c.
Type 3 - Single AWG 22 wire for control signals.
*
(1) True state (l): +4 volts 1.5 volts
False state (0): O volts +0.5, -0.0 volts
*
*
(2) Interconnecting cables: 60 feet maximum
*
(3) Rise time (driver): 75 sec 25 sec
*
(4) Receiver impedance:
4K ohms and 100
picofarads per receiver. Each driver
circuit shall be capable of driving a
minimum of 4 receivers.
The following is applicable to Type 1, 2, and 3
interfaces:
Waveforms are to be measured at sending end when
specified cable length is terminated with the worst
case specified terminating impedance.
30.5.8.2 CAU/CP Serial Interface - The CAU shall function as
an intermediary data processor in sending data from the ANCU
to the CP (velocity north, velocity east, true heading, and
magnetic heading) (VN, VE, θ T, and θ M) or receiving data from
166
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