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5−
47
The following controls and indicators appear on the front panel of the card. A
number of the yellow indicators, in any combination, may be on at the same
time. LED data buffers provide latches and drivers for the various LED
indicators:
a. The red FAIL LED lights if the on-card fuse blows or the power supply fails.
b. The yellow LOS LED indicates loss of signal or loss of sync.
c. The yellow OOF/AIS LED indicates out of frame.
d. The yellow BPV LED indicates excessive bipolar violations rate.
e. The yellow CRC/FBE LED indicates excessive code errors.
f. The yellow TIE LED indicates excessive time interval error.
g. The yellow MTIE LED indicates excessive maximum time interval error.
h. The yellow SLIP LED indicates one frame slip.
i. The yellow JITTER LED indicates excessive jitter (5 UIs or higher).
j. The seven segment display (SCAN) briefly shows the new input being
monitored when the input is changed; otherwise the display shows the bit
slip between the A/B input clocks.
k. The MON SELECT pushbutton is used for manually selecting each of the
five DS1/E1 inputs in sequence. In the SCAN state, a single push of the
button advances the SMC to the next available input. A double push
causes the phase detectors to remain on the current input, repeating the
100-second measurement over and over until the pushbutton is pressed
once again. In the MANUAL mode, a double push returns the SMC to the
SCAN state.
5.1030 Input
Jack
The MON IN jack allows the fifth DS1/E1 input signal (and tenth if so
equipped) to be received via front panel access.
5.1031 One-wire
Interface
A one-wire interface communicates to the 54550 Information Management
Card that the SMC is installed.
5.1032 Power
An on-card power converter provides the necessary circuit voltages from the
diode-combined A and B -48 volt, 100 mA battery supplies. The on-card fuse,
if it blows, lights the red FAIL LED and provides battery to the Fuse Alarm bus
connecting to pin 10 on the backplane terminal strip TB1.
5.1033 DC-to-DC
Converter
