TM 11-5820-803-12
Table 3-1. Operator Controls, Indicators, and Connectors.
Controls, indicators, or connectors
Function
FAULT section
ALARM
RESET/OFF/ON, three position toggle switch
RESET-Resets fault detection circuits, and tests FAULT indicators and
audible alarm.
OFF-Disables audible alarm (except for overtemperature condition).
ON-Audible alarm in enabled.
Audible alarm
Provides audible signal when a fault or overtemperature condition
occurs.
TEMPERATURE indicator
Illuminates when an overtemperature condition exists.
SECTION
TRANSMIT indicator
Illuminates when a fault occurs in the transmit section.
RECEIVE indicator
Illuminates when a fault occurs in the receiver section.
NOTE
The remaining FAULT Section indicators flash on and off to indicate an existing fault but remain illuminated after
fault is cleared. These indicators are then extinguished when RESET/OFF/ON switch is set to RESET. TRANSMIT
POWER indicator
Indicates when a loss of transmitter power occurs.
BIT SYNC indicator
Indicates when a loss of transmitter bit synchronization
occurs.
RECEIVE
POWER indicator
Indicates when a loss of receiver power occurs.
PH LOCK indicator
Indicates when a loss of carrier phase lock occurs.
BIT SYNC indicator
Indicates when a loss of receiver bit synchronization occurs.
CODER indicator
Indicates when the branch sync fails in the internal rece ive
error coding mode.
TRANSMIT section
INPUT DATA RATE, thumbwheel switch, six sections.
Selects transmit data rate and internal clock output rate
Section one-9 positions, sections two through five-10 from 19.200 kb/s to 9.9999 Mb/s in three bands:
positions and section six-3 positions.
Band 1-19.200 kb/s to 99.999 kb/s
Band 2-100.00 kb/s to 999.99 kb/s
Band 3-1.0000 Mb/s to 9.9999 Mb/s
ERROR CODING, three position rotary switch
INTERNAL-Selects an internal rate one-half encoder.
NONE-Selects a straight through path without error correction
encoding.
EXTERNAL-Selects an external encoder.
SOURCE, three position rotary switch
OPERATE-Connects the digital user's output data (which is selected by
the STD/CLK/ICF switch) to the transmitter baseband conditioner
input. Also disables the internal 2047 bit sequence generator. In
this mode, the digital user's output data, coded or uncoded
depending on the TRANSMIT ERROR CODING and the DIFF
ENCODE switch settings, is transmitted over the satellite
communications link.
LINK-Connects the internal 2047 bit sequence generator output to the
transmitter baseband conditioner input. In this mode, the 2047 bit
sequence, coded or uncoded depending on the TRANSMIT
ERROR CODING and the DIFF ENCODE switch settings, is
transmitted over the satellite communications link. Digital user
communications are interrupted on the transmit portion of the link.
TEST-Connects the internal 2047 bit sequence generator output to the
transmitted baseband conditioner input. In this mode, the 2047 bit
sequence, coded or uncoded depending on the TRANSMIT
ERROR CODING and DIFF ENCODE switch settings, is
transmitted over the satellite communications link The 70 MHz
receiver input is disconnected internally from the terminal output
and connected to an attenuated sample of the transmitter output.
The LOS/cable decoder is connected to a test signal from the
LOS/cable driver. The TEST switch is also enabled. Digital user
communications are interrupted on both the transmit and receive
portions of the link, and the data sent to the digital user will vary
depending on the TRANSMIT section, RECEIVE section, and
TEST switch settings.
3-2
