SEQUENCER (SEQ) CARD - TM-11-5805-688-14-10124

T.O. 31W-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3011

5-83. In normal operation, an analog error voltage,

the GC/DM card causes one gated clock signal to be

which continually varies in amplitude and polarity, is

generated to the channel card contained in the channel

generated from the voltage comparator. The error

address.

voltage is translated into digital data in the digital sample

and control circuits. The digital data from the digital

5-88. The end-of-scan generator circuits generate

sample and control circuits are applied to the data output

end-of-scan signal MEOS, which is applied to the OEG

buffer and to the D/A conversion circuits. The data from

card when the port count in the sequencer timing circuits

the data output buffer are clocked to the GC/DM card by

is equal to the maximum number of used ports selected

multiplexer clock signal MRI02-.

by the PORTS IN USE switches. End-of-scan signals

MEOS2B and MEOS2B- are derived from signal MEOS

5-84. The digital data applied to the D/A conversion

and applied to the GC/DM card. The end-of-scan signals

circuits are converted from digital to analog voltages that

effectively represent one word period.

are representative of the incoming voice signals. The

reconstructed signal voltages from the D/A conversion

5-89. The overhead port sequence selector circuit

circuits are identical to the voltage waveforms that will

produces minor frame equals port sequence signal

be decoded in the far-end demultiplexer. A slope control

MMF=PS, which is applied to the GC/DM card. The

signal from the digital sample and control circuits

signal is generated during each minor frame period that

effectively speeds up the D/A conversion circuits to track

is eligible to provide overhead service to an as-

and convert the higher frequency and/or higher

signed used port.

amplitude segments of the voice signals with a minimum

amount of distortion.

5-90. OVERHEAD ENABLE GENERATOR (OEG)

CARD.

5-85.

SEQUENCER (SEQ) CARD.

5-91. The OEG card generates negative and positive

5-86. The seq card generates the channel address,

stuff request signals, as well as timing signals used by

end-of-scan, and overhead MMF=PS signals that are

other cards in the multiplexer. Negative and positive

applied to the GC/DM card for timing purposes. The

stuff request signals MPSTOX and MNSTOX are applied

PORT STRAPPING switches on the card are manually

to the OEG card from the active channels that use the

set to select up to 15 active channels and up to 31 used

RCB card or the TE/TR channel card. Each channel

ports. The PORTS IN USE switches on the card are set

card input to the OEG card is interrogated for a stuff

to indicate the maximum number of used ports in a given

request as selected by the overhead address count

system configuration. End-of-scan timing signals are

signals MOHO through MOH3. The overhead count

generated on the card and applied to the GC/DM card

address signals are applied to the address select inputs

and the OEG card.

on the stuff request multiplexers. When the selected

channel has a positive or negative stuff request, a

5-87. The channel address generation circuits on the

positive stuff request signal MPSA- or a negative stuff

seq card generate 4-bit binary channel address signals

request signal MNSA- is applied back to the GC/DM

MCHAD1 through MCHAD8. These signals, which are

card.

generated at the system clock rate (MRIO), are routed to

the GC/DM card. Each 4-bit channel address applied to

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