|
|
T.O. 31W2-2GSC24-2
TM 11-5805-688-14-1
NAVELEX 0967-LP-545-3010
The card address applied as tens address signals TA1
5-578. SELF-TEST BLOCK DIAGRAM DISCUSSION.
and TA0 and units address signals UA0 through UA3 is a
number between 1 and 21 that responds to card
5-579. All of the diagnostic circuits on the cards in the
locations 1 through 21 in the MULTIPLEXER (upper)
multiplexer set are set to their error state when the SELF
card row or in the DEMULTIPLEXER (lower) card row in
TEST switch on the front panel is set to the on (up)
the multiplexer set.
position. This causes all the diagnostic error inputs to
the display card that are normally in the no-error state to
5-577. The lamp display decoder logic circuit generates
become low-level error signals during the self-test mode.
an enable signal that lights the appropriate indicator on
Therefore, the primary diagnostic circuits on the display
the front panel associated with a given error signal.
card now detect a faulty card diagnostic circuit by the
When multiplexer loss-of- timing signal MLOT- is applied
absence of an error condition on a given input. Each
to the decoder logic, the circuit generates signal LMTIM
diagnostic input to the display card in the self-test mode
to the front panel to light the LOSS OF MUX TIMING
is processed in the same priority order as that listed in
indicator.
When demultiplexer loss-of-timing signal
DLOT- is applied to the decoder logic, the circuit
generates signal LDTIM that lights the LOSS OF
5-580. When a diagnostic circuit malfunction on a card
DEMUX TIMING indicator. All other error indications are
is determined, the FAULT LOCATION display on the
processed from the 3-bit address select signals applied
front panel of the multiplexer set shows a number
from the system priority encoder to the decoder logic.
between 1 and 21 and the MULTIPLEXER CARD on
The decoder logic produces signal LMCRD, LDCRD, or
DEMULTIPLEXER CARD indicator is out to identify the
LMOOT that light the MULTIPLEXER CARD,
faulty card location. When the cards have no faulty
DEMULTIPLEXER CARD, or MULTIPLEXER OUT OF
diagnostic circuits, a self-test function is performed on
TOL indicator. Each time a card failure is decoded
the primary diagnostic circuits of the display card as
(LMCRD or LDCRD), and failure signal FAIL is
described in paragraph 5-584.
generated and routed to the ERD card for use as a re-
mote alarm. Multiplexer out of tolerance signal LMOOT
5-581. After the self-test function determines that all the
is also routed to the ERD card for use as a remote
diagnostic circuits on the cards are in a no-error
alarm. When the LAMP TEST switch on the front panel
condition, the secondary self-test diagnostic circuits test
is pressed, lamp test signal LT is applied to the decoder
the primary diagnostic circuits on the display card. When
logic, which causes all the front panel indicators to light.
a diagnostic circuit on the display card is determined to
When the equipment is in the self-test mode, an indicator
be faulty during the self-test function, the FAULT
enable signal from the self-test diagnostic logic causes
LOCATION display on the front panel shows 22 and the
the decoder logic to light all the front panel indicators
MULTIPLEXER CARD indicator goes out. When the
when all the diagnostic circuits are functioning properly.
circuits on the display card are determined to be in a no-
If a diagnostic circuit associated with a given front panel
error condition, the FAULT LOCATION display on the
indicator is malfunctioning during the self-test function,
front panel shows 00 and all indicators are lighted.
the decoder logic causes the associated front panel
indicator to go out.
5-582. The MUX OFF/DEMUX OFF/NORM switch on
the display card is set to the NORM position when the
multiplexer and demultiplexer are used in the multiplexer
set.
5-157
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |