Digital Data Combiner 1A12 Radio-To-Cable Circuits Functional Block Diagram Description

TM 11-5820-695-35

2-6.1 Digital Data Combiner 1A12 Radio-To-Cable

(1) The FR FAIL signal is applied directly at

Circuits Functional Block Diagram Description

U2A-1 and through inverter U6B at U6C-5, U7D-4, U3C-

11, UlOC-9 and to cable-to-radio monitor circuits (para

The functional relationships between radio-to-cable

2.5.1b). FR FAIL is normally logic 0 and U6B-4 is logic

plug-in components and J

chassis circuits of digital

1. This signal, twice inverted in U6C and U7C, applies

data combiner 1A12 are shown in figure 5-8.3. Each

logic 1 (open circuit) at relay K2 and K2 is deenergized

plug-in component is functionalized and the main signal

(normal). The relay contacts are open circuit and logic 1

paths (heavy lines) are shown in figure 5-8.3 as well as

(normal) is sent to the OCU. If FR FAIL changes to

control and alarm functions.

logic 1, the logic signals reverse, K2 is energized and

logic 0 (fault) signal is sent to the OCU. Signal 1

a. Combiner, Alarm-Status 1A12A2 (fig. 5-8.3

BPOWS at U7D-13 is normally logic A. This signal is

and 5-38.4). Combiner, alarm-status -11252 receives

used only in analog orderwire mode. It is connected

radio-to-cable status input signals as listed on the

through P1-H to AVOW switch 1A1252 at 52-1. The

following page. It processes these signals to generate

switch arm (52.2) is connected to OW SEL switch

output status signals that are routed to destinations

1A12S1 at S1-4 and the arm (S1-C2) is connected

indicated in the chart. The CLB signal is from LOOP

through P1-5 to route the signal to orderwire assembly

TEST switch 1A12S3; CLB is logic I when S3 is not in

lA13 at module 1A1343 (para 2-8e). The 1 BPOWS

DGM position and logic 0 when it is in DGM position. All

signal is connected-through this path only when S2

other input signals listed are logic 1 for normal status

(AVOW) is in the NORMAL position and S1 t(OW SEL)

and logic 0 for fault status. Normal logic states for --

is in the ANLG position. For any other combination of

output signals are listed in the chart below All input

positions of S1 and S2, the output at P1-H is open

signals listed are radio-to-cable monitor signals except

circuit. If the FR FAIL signal goes to fault status (logic

EQPT FAIL. This is a cable-to-radio signal (para 2.5. lb)

1), 1 BPOWS is also logic 1 and, in analog orderwire

and it is used here for an inhibit function.

mode, orderwire assembly 1A13 generates an alarm

signal that lights the CNTRL ALARM red indicator at

lA15A8.

Change 6 2-24.1