Cable-to-Radio Circuits

TM 11-5820-695-35

(4) Digital data combiner 1A12 uses the plug-in

components listed in the chart below and associated

(1) Module A1 processes only digital orderwire

signals. When the OW SEL switch is in the ANLG

chassis-mounted connectors and components. Module

Al, and parts of A3 and A4 are used for cable-to-radio

position, module A1 is not used and its operation is

inhibited. In the digital orderwire mode of operation

(transmit) functions; part of modules A3 and A4, and

(OW SEL in DGTL position), the digital orderwire signals

modules A5 through A8 are used for radio-to-cable

are applied to digital orderwire multiplexer 1A12A1,

(receive) functions.

where they are converted from balanced to TTL level.

Ref Desig

Description

Module A2 provides status and fault monitoring

functions for all circuits.

Digital OW multiplexer

Combiner, alarm-status

Paragraphs b and c provide descriptions of main signal

Digital randomizer

Digital buffer interface

paths in 1A12. Functional block diagrams of cable-to-

Digital traffic retimer

radio and radio-to-cable circuits of 1A12 are provided in

Digital OW retimer

paragraphs 2-5.1 and 2-6.1.

Digital OW demultiplexer

Digital regenerator

The DOW signal is retimed and conditioned (para 2-

5.1a) and the DOW and DVOW signals are multiplexed

(5) Front panel switches provide control of

into a single 32 kb/s signal (CVDOW). The DOW,

operating modes of digital data combiner 1A12. The

DVOW and clock signals are monitored to generate a

OW SEL switch (1A12S1) is in the DGTL position for

status signal (CDOW FAIL). The CVDOW signal is

digital orderwire (DOW and DVOW) and in the ANLG

routed to module A4.

position for analog orderwire (AVOW). The DATA

RATE SEL (MB) switch (1A12S4) is set to the selected

(2) The balanced data and timing signals are

data rate. The AVOW (1A12S2) and LOOP TEST

applied to digital buffer interface 1A12A4 where they are

(1A12S3) switches are used for test and maintenance

converted to TTL level. They are then routed to module

functions. For normal operation, 1A12S2 is in NORM

A3 where they are processed. In the transmit mode, at

position and 1A12S3 in OFF (NORMAL) position.

module A3 data is scrambled for application to digital

interface buffer 1A12A4. Timing in the transmit mode is

b. Cable-to-Radio Circuits. The data and timing

controlled by a phase lock loop that monitors differences

in phase.

signals from the DGM and the digital orderwire (DOW

and DVOW) or analog orderwire (AVOW) signals from

the OCU and DLED are applied to the cable-to-radio

circuits of digital data combiner 1A12 (fig. 5-8.2).

Change 6 2-8.6