Problem-Solving Using A Connected Pc; Problem-Solving Using The Front Panel Display - GE MDS 4790M Installation And Operation Manual

Event Log
64
Table 15. 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 61).
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.

Problem-Solving Using a Connected PC

Determination of radio status and reprogramming is normally done from a PC
connected to the master station. Useful commands for performing diagnostics
are listed in Table 6 on page 27. For instructions on performing diagnostics
using a connected PC, see "Performing Network-Wide Radio Diagnostics" on
page 65.

Problem-Solving Using the Front Panel Display

The radio includes several useful tools in the
that can be used to identify system problems. Brief descriptions of Event Log
commands are given below. Other commands useful for performing
diagnostics are listed in Table 13 on page 52. Refer to Section 6.5, Screen
Descriptions, for detailed information about these commands.
The Event Log is a helpful way to identify system problems. The radio stores
recent events, such as turning the primary power on, in a log that can be
reviewed using the
Event Log
page 62). In many cases, the events leading up to a failure can be reviewed to
help determine the cause of a problem. Event log messages are also helpful
when calling GE MDS for technical assistance.
• Major alarms generally indicate a hardware failure or other
abnormal condition that will prevent (or hamper) further operation of
the radio link. Generally speaking, major alarms trigger a switch-over
of internal transceiver board assemblies on a master station
configured for redundant operation.
Connections to a relay that is actuated by these alarms are
provided on the rear panel
page 20.)
• Minor alarms generally will not prevent operation of the radio link,
but may impair performance. This includes out-of-tolerance
conditions, low signal-to-noise ratios, etc. The cause of a minor alarm
should be investigated and corrected to prevent an eventual system
failure.
Connections to a relay that is actuated by these alarms are
provided on the rear panel
page 20.)
MDS 4790M (MPT 1411) I/O Guide
Diagnostics
screen (for a full description, see "Event Log" on
connector. (See Figure 15 on
ALARM
connector. (See Figure 15 on
ALARM
MDS 05-3628A01, Rev. B
and menus
Event Log