Specifications

26 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. E

Invisible place holder

Figure 23. Front Panel Controls and Indicators

LED Indicators

The basic operation of the transceiver board(s) can be checked 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 equally to transceiver board A and B.

Normally, only the green

ACTIVE LED (and, in master stations config-

ured for redundant operation, one of the yellow

STBY LEDs) should be

lit. All other red LEDs are alarm indicators. If lit, they indicate a poten-

tial problem in the radio system.

Refer to Figure 24 and the text that follows for a detailed explanation of

the LED indicators.

Invisible place holder

Figure 24. 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

ACTIVE STBY ALARM RX ALR TX ALR I/O ALR