Specifications

MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 27

NOTE: Additional LEDs are located behind the removable front panel.

They are intended primarily for troubleshooting the radio, and

are not required for basic operation. These LEDs are described

in “Local Problem-Solving” on Page 76.

Front Panel Display

At initial power-up, the front panel display shows the start-up screen

(Figure 25). After a period of time without any activity, the front panel

display darkens. The display can be restored by pressing any of the front

panel buttons.

Invisible place holder

Figure 25. Start-up Screen (typical)

The start-up screen displays the owner’s name and message. Customers

typically use these fields to display the system name and site name.

Other screens, and the use of the control buttons, are described in

Section 6.5, Screen Descriptions, beginning on Page 60.

Table 5. Explanation of Front Panel LEDs

LED Name Color Meaning When Lit

ACTIVE

Green Transceiver board (A or B) is the selected unit.

STBY

Yellow Transceiver board (A or B) is currently in stand-by

mode. (Functional on master station configured for

redundant operation only.)

ALARM

Red A major or minor alarm event has occurred; use the front

panel’s Active Radio Status screen to list current alarm

events (see Page 73).

RX ALR

Red Difficulty receiving—may be due to an antenna problem,

receiver fault, or other condition causing no or a weak

received signal level.

TX ALR

Red Transmit circuitry fault.

I/O ALR

Red A data framing or parity error has occurred over the data

port.