28 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
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Figure 24. Front Panel Controls and Indicators
LED Indicators
You can check the basic operation of the transceiver board(s) by
viewing the LED indicators on the front 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. On a redundant radio (spare trans-
ceiver board and power supply installed), the references given here
apply to transceiver board A and B equally.
Normally, only the green ACTIVE LED (and, in master stations config-
ured for redundant operation, one of the yellow STBY LEDs) are lit. All
other red LEDs are alarm indicators. If lit, they indicate a potential
problem in the radio system.
Refer to Figure 25, Table 6 on Page 29, and the text that follows for a
detailed explanation of the LED indicators.
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Figure 25. LED Indicators
ENTER
ESCAPE
LED INDICATORS LCD DISPLAY PROGRAMMING
AND CONTROL KEYS
ACTIVE STBY ALARM RX ALR TX ALR
I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR
I/O ALR
A
B
A
B
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
ACTIVE STBY ALARM RX ALR TX ALR I/O ALR
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