Specifications

MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 79
• Major alarms generally indicate a hardware failure or other
abnormal condition that will prevent (or hamper) further opera-
tion of the radio link. Most major alarms trigger a switch-over
of internal transceiver board assemblies on a master station con-
figured for redundant operation.
• Connections to a relay that is actuated by these alarms are pro-
vided on the rear panel
ALARM connector. (See Figure 22 on
Page 23.)
• 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, 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 pro-
vided on the rear panel
ALARM connector. (See Figure 22 on
Page 23.)
System Bench Testing Set-up
Figure 35 shows a sample test setup that can be used to verify the basic
operation of master and remote radios. This test can be performed with
any number of remote radios by using a power divider with the appro-
priate number of output connections.
MDS x710 and x790 radios include an internal RTU simulator. Use the
RTU command (see “RTU [ON/OFF/0-80]” on Page 48) to poll remote
radios. The command reports the number of polls sent, polls received,
and the number of errors detected.
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