User's Manual

MDS 05-3301A01, Rev. C MDS 9810 Installation and Operation Guide 51
7.2 Alarm Codes
When an alarm condition exists, the transceiver creates an alarm code
that can be read on an HHT connected to the radio’s
DIAG(NOSTICS)
port. These codes can be very helpful in resolving many system difficul-
ties.
Checking for Alarms—STAT command
To check for the presence of alarms, enter
STAT on the HHT. If no alarms
exist, the message
NO ALARMS PRESENT appears at the top of the display.
If an alarm does exist, a two-digit alarm code (00–31) is displayed, and
it is identified as a major or minor alarm. A brief description of the alarm
is also given. Alarm codes and their meanings are listed in Table 12.
If more than one alarm exists, the word
MORE appears at the bottom of
the screen; additional alarms can be viewed by pressing .
Major Alarms vs. Minor Alarms
Major alarms report serious conditions that generally indicate a hard-
ware failure, or other abnormal condition that will prevent (or seriously
hamper) further operation of the transceiver.
With the exception of alarm code 00 (network address not pro-
grammed), major alarms generally indicate the need for factory repair.
Contact MDS for further assistance.
Minor alarms report conditions which, under most circumstances, will
not prevent transceiver operation. This includes out-of-tolerance condi-
tions, baud rate mismatches, etc. The cause of these alarms should be
investigated and corrected to prevent system failure.
PWR SYNC TXD RXD
Table 11. LED Status Indicators
LED Name Description
PWR • Continuous—Power is applied to the radio, no problems detected.
• Flashing 5 times per second—Fault indication.
See Section 7.0, TROUBLESHOOTING (beginning on Page 50).
• Flashing once every 4 seconds—Radio is in Sleep Mode.
SYNC Lights continuously to indicate the radio is receiving/sending
synchronization frames. Within 16 seconds of start-up, this LED
should be lit continuously.
TXD Indicates EIA-232 space signal (logic high) input to the DB-25
connector.
RXD Indicates EIA-232 space signal (logic high) output from the DB-25
connector.
ENTER