TM 11-6625-3041-12/TO 33Al-8-908-1
FRONT PANEL CONTROLS, INDICATORS, AND CONNECTORS (cont)
2-1.
Type
Function
Name
Momentary
When pressed, sets ERRORS display to zero
RESET
and starts a new total errors measurement
DISPLAY
pushbutton switch
and a new bit-error-rate (BER) measurement.
Displays total errors detected in received
ERRORS
7-digit display
data pattern.
BER
Three indicators
Indicate results of bit-error-rate measure-
8
ment. Blink when power is first turned on,
9
when input data and timing signals are first
10
applied, or when the RESET DISPLAY button
is pressed, to indicate BER measurement is
not complete. BER measurement duration
varies with DATA RATE setting from 0.02
seconds at highest rate of 4608 kb/s to
5.6 minutes at lowest rate of .6 kb/s.
Red indicator
Lights when BER is excessive (1 or more
NO GO
errors per 1,000 bits).
MARGINAL
Yellow indicator
Lights when BER is marginal (from 1 error
per 100,000 bits to just under 1 error per
1,000 bits).
Lights when BER is acceptable (less than
GO
Green indicator
1 error per 100,000 bits).
Triaxial connector
Provides connection for station clock
STA CLK
input.
Green indicator
Lights when TIMING switch is set to STA CLK
STA CLOCK
and a station clock signal is present at
STA CLK input.
DATA IN
Green indicator
Lights when data signal, appropriate to the
DATA-RATE family selected, is present at
the proper DATA IN connector. Will not all
light with a diphase signal of all zeros or
ones.
Green indicator
Lights when timing signal, appropriate to
TMG IN
the DATA-RATE family selected, is present
at the proper TMG IN connector. A diphase
data input will light the TMG IN indicator
when the DATA RATE is set for the diphase
family (.6-32 kb/s).
BALANCED
Provides connection for balanced NRZ data
Triaxial connector
input signal used with DATA-RATE family
DATA IN
of 128-4608 kb/s.
2-3