FRONT PANEL BLOCK DIAGRAM DISCUSSION

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

an error condition, the display card generates demux

c. LOSS OF FRAME B signal LLOFB is

card

error

signal

LDCRD

that

lights

the

generated and applied to the front panel to light the

DEMULTIPLEXER CARD indicator on the front panel.

LOSS OF FRAME B indicator when signal DLOF is

The appropriate card address is generated on the display

applied to the ERD card. Remote LOSS OF FRAME B

card and applied to the front panel to produce the card

signals LOFBC1/C2 are generated from the ERD card at

address in the FAULT LOCATION numerical display on

this time.

the front panel.

d. The diagnostic circuits on the ERD card

5-152. Signals FAIL, DLOTRA-, and LMOOT are

generate link error rate signal LLER to light the LINK

applied to the ERD card to develop three remote alarm

ERROR RATE indicator on the front panel when a link

signals as described in paragraph 5-163. Card failure

error condition is decoded in the ERD card. Remote link

signal FAIL is generated each time a faulty card

error rate signals LLERC1/C2 are generated from the

condition in the multiplexer set is detected and a card

ERD card at this time.

address is applied to the front panel. Loss of timing

remote alarm signal DLOTRA is generated each time

e. Remote out-of-tolerance signals OOTCl/C2

signal DLOT indicates an error condition as described in

are generated when out-of tolerance signal MLOOT is

paragraph 5-150. Mux out of tolerance signal LMOOT is

applied to the ERD card from the display card. Card

generated from the display card as described in

failure signals FAILCl/C2 are generated from the ERD

paragraph 5-148.

card when the FAIL signal is applied from the display

card.

5-153. The diagnostic circuits on the ERD card

Remote

power

supply fail

signals

generate six remote alarm signals that are routed to the

PSFC1/C2 are generated from the ERD card when

remote alarm connector on the rear panel. Self-test

power supply error signal PSFR is applied from the

signals ST1and ST2are applied to the cards in the

power supply.

multiplexer set, and signals LLOFA, LLOFB, and LLER

are applied to the front panel. These signals are

5-154. FRONT

PANEL

BLOCK

DIAGRAM

described as follows:

DISCUSSION.

a. Self-test switch signal STS is applied to the

5-155. The front panel diagnostic indicators visually

ERD card when the SELF TEST switch on the front

display the diagnostic error conditions detected in the

panel is set to the on (up) position. Signal STS enables

multiplexer set. The diagnostic indicators are mounted

the ERD card to generate identical self-test signals

on the front panel within three groups identified as

ST1and ST2that are applied to the cards in the

follows: SYSTEM STATUS, FAULT LOCATION, and

multiplexer set.

ALARMS. One of the SYSTEM STATUS indicators

lights when one of the signal inputs to the multiplexer set

b. Loss of frame A signal LLOFA is generated

is faulty. One of the FAULT LOCATION indicators lights

and applied to the front panel to light the LOSS OF

and a card address is displayed when one of the cards in

FRAME A indicator when signal DFS is applied to the

the multiplexer set is in an error condition. The POWER

ERD card. Remote loss of Frame A signals LOFAC1/C2

SUPPLY indicator in the ALARMS group lights when a

are generated from the ERD card at this time.

power supply error condition is

5-35