Table 5-6. Diagnostic Display Priority (Cont)

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

Front Panel

Order of

Error

Card

Numerical

Priority

Signal

Origin

Indicator

Display

DPSA-

SB, TD,

DEMULTIPLEXER CARD

1 Thru 15

VD, or

(Note 1)

NBSB

OOTXX-

RCB

MULTIPLEXER CARD

(Note 2)

DISPLAY

MULTIPLEXER CARD

Notes:

1. Error signal can be generated by any active channel

in a configuration, using the RCB or TE/TR card in

a multiplexer channel or the SB or TD card in a

demultiplexer channel.

Internal error signal developed by display card in

self-test mode.

At the same time, each bit in the 4-bit channel address

The priority of the five signals monitored by the encoder

for the faulty channel is applied to one input on one of

are listed in order in the encoder blocks in figure 5-43.

the multiplexers in the card address encoder.

5-573. The basic operation of the de- multiplexer

5-571. The operation of the demultiplexer channel card

common card error priority encoder is the same as that

error detector is basically the same as that described for

described in paragraph 5-572. The eight diagnostic error

the multiplexer channel card error detector in paragraph

signals applied to the priority encoder are from the seq,

5-570.

FS, ERD, and GC/DM cards.

5-572. The multiplexer common card error priority

5-574. The out-of-tolerance multiplexer has an out-of-

encoder has a total of five card diagnostic error signals

tolerance signal input from each active multiplexer RCB

applied from the OEG, GC/DM, and seq cards. When

or TE/ TR channel card in the multiplexer set. When one

two or more of the error signals are reported to the

of the out-of-tolerance signals (OOT01 through OOT15)

encoder, the error signal from the common card with the

is applied to the multiplexer, an enable signal is applied

highest priority is processed. The priority encoder

to the out-of-tolerance one-shot multivibrator. In turn, the

generates an error signal that is applied to the system

multi- vibrator generates a temporary inhibit signal

priority encoder. The encoder also generates a card

(approximately 1.5 seconds) to the control flip-flop to

address for the selected card error that is applied to the

inhibit further clock signals from incrementing the

inputs on the multiplexers in the card address encoder.

channel address counter.

5-155