In the transmit direction

TM 11-5820-695-35

from the remote site is detected in the receiver and the

the same. At Digital data combiner 1A12, OW SEL

recovered data/orderwire signal is routed to 1A12

switch 1A1251 must be set to DGTL or ANLG position

through 1A13. In 1A12, the data and orderwire signals

according to the orderwire mode selected.

are separated, retimed, regenerated, and demultiplexed

(digital orderwire), then routed to the DGM and OCU.

(1) In the transmit direction, when operating in

For analog orderwire, the AVOW signal is routed to

digital orderwire mode, the digital orderwire signals

1A13.

(DOW and DVOW) and the data signal are combined in

1A12 and the combined signal is adjusted to the level

(3) The signals use in digital data combiner

required by the transmitter modulator circuits. For

1A12 block diagram descriptions are listed below.

analog orderwire mode (AVOW), the orderwire signal is

Status and alarm signals have a not bar, (e.g., CLB, to

sent to orderwire assembly 1A13.

In lA13 it is

indicate that logic 0 is the active state and logic 1 is the

processed as described in paragraph 2-8. In analog

inactive state). Thus, when LOOP TEST switch 1A12S3

orderwire mode, there are no digital orderwire signals to

is in the OFF or RADIO position, CLB is logic 1

combine with the data signal and the output from 1A12

(inactive). When S3 is in the DGM position, CLB is

to the transmitter circuits consists of the data signal

logic 0 (active). FR FAIL is logic 0 normally and goes to

only. The data signal and the analog orderwire signal

logic 1 (fault) when the from radio data signal fails. For

are combined in module 1A4, as described in paragraph

the OW SEL switch (1A1251), signal AVOW/DVOW is

2-10.

logic 1 for ANLG (which selects AVOW) and logic 0 for

DGTL (which selects DVOW).

(2)

In the receive direction, the radio signal

Mnemonic

Meaning

AVOW/DVOW

Signal from OW SEL switch 1A12S1

BFRD DATA

Buffered data signal from DGM

BFRD TMG

Timing signal for BFRD DATA signal

BLB

Signal from LOOP TEST switch 1A12S3

CDOW FAIL

Data status signal from 1A12A1

CLB

Signal from LOOP TEST switch 1A12S3

CLOCK

32 KHz clock for retimed data from radio CVDOW signal

CVDOW

Multiplexed DVOW and DOW signals

CVDOW RPLL FAIL

Status signal for 1A12A6

Change 6 2-8.4