Led Indicators - GE MDS 4790M Installation And Operation Manual

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LED Indicators

The basic operation of the transceiver board(s) can be checked by viewing the
LED Indicator panel. The top row of indicators shows the status of the "A"
transceiver board; the bottom row shows the status of the "B" transceiver
board. In a non-redundant master station, transceiver board A is the only radio
installed. On a redundant radio (spare transceiver board and power supply
installed), the references given here apply equally to transceiver board A and
B.
Normally, only the green
redundant operation, one of the yellow
LEDs are alarm indicators. If lit, they indicate a potential problem in the radio
system.
Refer to Figure 18 and the text that follows for a detailed explanation of the
LED indicators.
Table 4. Explanation of Front Panel LEDs
LED Name Color
ACTIVE Green
STBY Yellow
ALARM Red
RX ALR
Red
TX ALR Red
I/O ALR Red
MDS 4790M (MPT 1411) I/O Guide
LED (and, in master stations configured for
ACTIVE
LEDs) should be lit. All other red
STBY
Invisible place holder
Figure 18. LED Indicators
Meaning When Lit
Transceiver board (A or B) is the selected unit.
Transceiver board (A or B) is currently in stand-by mode.
(Functional on master station configured for redundant
operation only.)
A major or minor alarm event has occurred; use the front
panel's Active Radio Status screen to list current alarm
events (see page 61).
Difficulty receiving—may be due to an antenna problem,
receiver fault, or other condition causing no or a weak
received signal level.
Transmit circuitry fault.
A data framing or parity error has occurred over the data
port.
MDS 05-3628A01, Rev. B