GATED CLOCK/DATA MUX (GC/DM) CARD - TM-11-5805-688-14-10125

T.O. 31W-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3011

5-92. The word 24 generation circuits generate word

generate word 27 signal W27, word 28 signal MW28,

24 bit 0 signal MW240X and word 24 signal MW24NX

and words 24 through 29 signal MWC2429 that are used

when the word count in signals WCO through WC4 from

for timing purposes on the card. Word 28 signal MW28

the GC/DM card contains a count of 24 and multiplexer

is routed to the seq card as a control signal.

clock signal MRIO occurs. The word 24 signals are

applied to the channel cards to initiate the overhead

5-97. The stuff code generation circuits generate three

service function as described in the RCB card

different 23-bit stuff command codes: the positive stuff

discussion. The end-of-scan generation circuits produce

code (PSC), the negative stuff code (NSC), and the no

end-of-scan signal EOS2 to the word 24 generation

action code (NAC). All three codes are generated at the

circuits when end of-scan signal MEOS is applied from

same time, during word counts 1 through 23, and are

the seq card. At the same time, the circuits also

applied to the overhead data multiplexer.

generate end-of-scan signal MEOS3NX that is applied to

the RCB cards in the multiplexer.

5-98. The minor frame generation circuits produce

5-93. The system clock distribution circuits receive

minor frame count signals MMFCO through MMFC4 that

system clock signal from the RT card and, in turn,

sequentially count minor frames 1 through 31. These

generate the multiplexer clock signals MRIO1- through

signals are applied to the overhead data multiplexer and

MRI08-. These signals are distributed to the channel

to the seq card. During minor frame count 31, minor

cards as timing signals. System clock signal MRIO that

frame terminal count signal MMFC31 is generated and

is applied to the GC/DM card is identical to system clock

applied to the channel cards that use the RCB card.

signals MRIO1- through MRI08-.

Signal MMFC31 represents one major frame period.

The minor frame count is advanced one count each time

end-of-scan signal MEOS2B- from the seq card and

5-94.

GATED CLOCK/DATA MUX (GC/DM) CARD.

word 29 signal W29 from the word generation circuits

occur.

5-95. The GC/DM card receives and combines the

channel data from the active channel cards into one

5-99. The gated clock generation circuits generate

serial data stream that is applied to the RT card. Control

gated clock signals (MGCO1 through MGC15) as

and timing signals used in the multiplexer function are

required to service the active channel cards. One gated

also generated on the card as described below.

clock signal is generated for each active channel. For

example, a multiplexer with 10 active channels uses

5-96. The word generation circuits generate word

gated clock signals MGCO1 (channel 1) through MGC10

count signals WCO through WC4 to provide 5-bit

(channel 10). Each gated clock signal applied to an

sequential word counts 1 through 29. The signals are

active channel gates one channel data bit to the output

applied to the stuff code generation circuits. Word count

data multiplexer on the card. At the same time that a

signals WCO, WC1, and WC2 are applied to the

gated clock signal is generated, 4-bit binary channel

overhead data multiplexer, and word count signals

address signals GCAD1 through GCAD8, which contain

WCO, WC1, WC2, and WC4 are applied to the OEG

the same address as the active channel being

card.

The

circuits

also

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