MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 83
• Major alarms generally indicate a hardware
failure or other abnormal condition that prevents (or hampers)
further operation of the radio link. Most major alarms trigger a
switch-over of internal transceiver board assemblies on a master
station configured for redundant operation.
• Connections to a relay that actuates with these alarms are pro-
vided on the rear panel ALARM connector (see Figure 23 on
Page 25).
• Minor alarms generally will not prevent operation of the radio
link, but may impair performance. This includes out-of-toler-
ance conditions, low signal-to-noise ratios, and so on. Investi-
gate the cause of a minor alarm and correct it to prevent an
eventual system failure.
• Connections to a relay that actuates with these alarms are pro-
vided on the rear panel ALARM connector (see Figure 23 on
Page 25).
System Bench Testing Set-up
Figure 36 on Page 84 shows a sample test setup that you can use to
verify the basic operation of master and remote radios. You can perform
this test with any number of remote radios by using a power divider with
the appropriate number of output connections.
MDS x710A and x790A radios include an internal RTU simulator. Use
the RTU command (see “RTU [ON/OFF/0-80]” on Page 52) to poll
remote radios. The command reports the number of polls sent, polls
received, and the number of errors detected. For more information on
polling with the RTU simulator, refer to Publication 05-3467A01.
It is very important to use attenuation between all units in the test
setup. The amount of attenuation required depends on the number of
units being tested and the desired signal strength (RSSI) at each
transceiver during the test. In no case should a signal stronger than
–50 dBm be applied to any radio in the test setup.
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
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