Figure 5-29. RT Card, Transition Encoder Timing Circuits

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

Figure 5-29. RT Card, Transition Encoder Timing Circuits - Block Diagram

The N=6 (28.8 kHz) output from the eight-stage N

the composite OR gate and latch circuits on the card

when timing signals T3600A and T4800A are missing.

binary counter is applied to the divide-by six counter,

The two activity detector circuits are set and held in the

which, in turn, supplies the 4800-Hz timing signals to the

error state by self-test signal ST2 when the SELF TEST

4800-Hz distribution buffers. The distribution buffers

switch on the front panel is set to the on (up) position.

produce 4800-Hz timing signals T4800A, T4800B, and

When the SELF TEST switch is set to the off (down)

T4800C that are routed to the channel card locations.

position, signal ST2 is removed and the activity detector

The 3600-Hz and 4800Hz activity detectors sample the

circuits return to their no-error state.

timing signals and generate diagnostic error signals to

Change

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