Order-wire Circuit Operation

TM 11-5805-424-15/NAVSHIPS 0967-220-9013/TO 31W2-2G-41

b. Talk-Request Detection.

from IN-12 ungenerated by bistable FFA-1 through the

hidden OR gate to the risetime and falltime shaper.

Unregenerated output from amplifier IN-12 is also

(1) Under normal data operation, amplifier IN-16

applied to AND gate GAS-4 for use with the no-

is held on by the no-alarm output (-15 volts) of amplifier

transition receive alarm circuits (para 5-24).

IN-10 in the receive input and carrier alarm module.

Both timers are inactive, and bistable FFB-1 is in a set

state with a high positive level output at its 1-output line,

5-23. Order-wire Circuit Operation (fig. 8-5)

and TALK REQUEST indicator lamp DS3 is extingished.

a. Talk-Request Generation

(2) When a 1.5-second talk-request signal is

received by the receive input and carrier alarm module,

(1) When TALK REQUEST switch 1A1S3 is

amplifier IN-10 assumes the alarm condition and

depressed, a ground is applied through the hidden OR

provides a High Positive Level at its output (para 5-24).

gate to amplifier IN-24 Amplifier IN-24 applies a ground

This High Positive Level cuts off amplifier IN-16. which

output to trigger bistable FFF-1 and (through OR gate

activates initial timer Q2, Q3, Q4. The negative output

GOA-6) to bistable FFE-1. A remote talk-request signal

of amplifier IN-16 inhibits AND gate GAI-3 which

(ground may also be used to initiate the talk request. (If

prevents receive data signals from being applied to the

this application is desired, terminals 1, 2, and 3 are

receive data output terminals. The initial timer times out

connected together).

a delay of approximately 1 second (adjustable by

DELAY resistor 1A1R9). After the delay the positive

(a) With FFF-1 cleared the positive output

output of initial timer Q2. Q3, Q4, is applied to the

from its 0-output line is applied to OR gate GOA-2 in the

window timer Q5, Q6, Q7, (4 below) through resistor

transmit output and carrier alarm module (inhibiting the

R11 to amplifier IN-17.

transmit carrier alarm circuits) and to OR gate GOA-1 in

the input interface and common alarm module

(3) Positive output from initial timer Q2, Q3, Q4 is

(inhibiting the no-transition-send alarm circuitry).

inverted by amplifier IN-17, applying a negative input to

NAND gate GAD-3. The positive talk-request signal

(b) With FFE-1 cleared the positive output

(input to amplifier IN-161 maintains NAND gate GAD-3

from its O-output line inhibits bistable FFC-8 in the

in an inhibited condition, which provides a positive

transmit 64 divider module, thus inhibiting the transmit

output that is inverted by amplifier IN-18 to a negative

carrier. The negative output at the 1-output line of FFE-

level that has no effect on bistable FFB1. However,

1 activates the 1.5-second delay; after 1.5 seconds,

when the talk-request signal is removed (after 1.5

FFE-1 is set by the 1.5-second delay. The positive

seconds, both NAND gate GAD-3 inputs are negative.

output at the l-output line of FFE-1 deactivates the

providing a negative output that clear bistable FFB-1

1.5second delay, and removal of the positive output

when inverted to a positive signal by amplifier IN-18.

from the O-output line of FFE-1 unblocks the transmit

With bistable FFB-1 cleared a negative output is present

carrier. Thus, the carrier signal is interrupted for a

on its 1-output line, and a positive output is present on

period of exactly 1.5 seconds; this is interpreted at the

its 0-output line. These outputs serve in automatic

other site as a talk request signal ( b below). The

switching of timing bistable FFA-1 in the receive data

transmit carrier alarm remains inhibited during the entire

output module (para 5-221. The negative output at the

talk request mode of operation.

1-output line of FFB-1 inverted by amplifier IN19,

provides a ground to light TALK REQUEST indicator

(2) When the order-wire mode of operation is no

lamp DS3. The positive level at the 0-output line

longer required, TALK REQUEST RESET pushbutton

inhibits OR gate GOC-1 in the receive input and carrier

1A1S4 is depressed, applying + 15 volts to bistable

alarm module, and OR gate GOA-3 in the receive data

FFF-1, setting the bistable, and removing the positive

output

inhibit level from OR gate GOA-2 (transmit carrier alarm

circuits) and GOA-1 (NO-TRANSITIONSEND-ALARM

circuits).

Change 5

5-25