VOICE ENCODER (VE) CARD - TM-11-5805-688-14-10123

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3011

5-78. The timing recovery (TR) circuits generate the

pulse transition is a positive-going or a negative-going

timing signals that are synchronized with the incoming

transition. The timing signals from the timing generator

asynchronous digital data. As described in the RCB card

to the RCB circuits are developed from the T4800 or the

discussion, the timing signals are necessary to clock the

T3600 (Hz) timing signals from the RT card. The

incoming data pulses into the RCB circuits. The data

selected timing rate is either 225, 300, 450, 600, 900, or

receiver in the timing recovery circuits conditions the

1200 Hz, corresponding to the input rate ranges of 75,

applied digital data (DIXX) into TTL levels that are

100, 150, 200, 300 or 400 bps, respectively. The timing

compatible with the logic circuits on the card. The data

signals also synchronize the 3bit code output from the

pulses are applied to a transition detector circuit and to

encoder so that the 3-bit data codes and the TE timing

the RCB circuits. The transition detector circuit applies a

signals applied to the RCB circuits are synchronous

reset signal to the timing generator circuit each time a

pulse transition occurs. The timing generator circuit, in

5-80. The TE/TR switches on the card are set to apply

turn, receives a continuous timing output from the timing

the data and associated timing signals from the TE or TR

oscillator. The timing signals are divided down to

circuits to the RCB circuits. The RCB circuits process

produce the selected timing output rate that is the same

the incoming data to be synchronous with the multiplexer

as the incoming data bit rate. By resetting the timing

timing functions as described for the RCB card. The

generator circuits each time a positive-going or negative-

RCB circuits on the TE/ TR card do not have the coarse

going pulse transition occurs, the continuous TR timing

rate conversion circuits associated with the RCB card.

signals to the RCB circuits are effectively held in

The data output (MDT002) is clocked to the GC/DM card

synchronization with the conditioned data pulses applied

by system clock signal MRI02-. The positive and

to the RCB circuits.

negative stuff request signals (MPST02 and MNST02)

are applied to the OEG card.

5-79. The transition encoder circuits generate the

timing signals that are synchronized with the incoming

5-81.

VOICE ENCODER (VE) CARD.

asynchronous digital data. The data receiver in the

transition encoder circuits conditions the applied digital

5-82. The VE card receives one voice channel and

data and applies the conditioned pulses to the 3-bit

converts the incoming analog signals into synchronous

transition encoder circuits. Each time a positive-going or

digital data that can be combined with other data

negative-going transition of a data pulse occurs, the 3-bit

channels in the GC/DM card. The VE card processes

transition encoder circuits generate a 3-bit digital code

signals in the range of 150 to 3500 Hz. The voice

that is synchronous with the TE timing pulses being

signals are applied to a voltage comparator circuit that

applied to the RCB circuits. The 3-bit code identifies the

compares the incoming analog signals with a

following: that a transition has occurred; the position of

reconstructed analog signal voltage from the D/A

the transition as related to the first half or the second half

conversion circuits. In real time, the reconstructed

of the timing signal at the time of transition; and that the

analog signals should be almost identical to the incoming

analog signals to the card. The difference voltage

developed in the voltage comparator circuit is applied as

an error voltage to the digital sample and control circuits.

5-22