MDS 05-2806A01, Rev. A MDS iNET 900 User’s Guide 91
Look over the RSSI by Zone Screen’s values (Page 42) for zones that are
more than a couple of dBs (decibels) below the average level, and for
signal level values that are likely to provide marginal service. For
example, the average level is less than –85 dBm during normal condi-
tions with a data rate of 256 kbps.
If the RSSI levels in each zone are within a few decibels (dB) of each
other, but less than –85 dBm, then a check should be made of the aiming
of the antenna system and for a satisfactory SWR. Call in a radio tech-
nician to deal with wireless issues. Refer the technician to the RADIO
MEASUREMENTS on Page 91 for information on antenna system
checks.
NOTE: For a data rate of 512 kbps, the average signal level should be
–77 dBm or stronger.
Serial Port Statistics Menu
(See Serial Data Statistics Menu on Page 35)
This screen provides top-level information on data exchanges between
the unit’s serial ports and the network through the wireless and the
Ethernet (data) layers. These include:
You can use this screen as a barometer of port activity at the data and IP
levels.
Diagnostic Tools Menu
(See Diagnostic Tools Menu on Page 51)
This menu has two tools, the Radio Test Menu for radio technicians, and
the Ping Utility for network technicians. PING can be used to verify
connectivity with various pieces of equipment connected to the iNET
network. This includes iNET 900 units and user-supplied Ethernet
devices.
4.2 RADIO MEASUREMENTS
There are several measurements that are a good practice to perform
during the initial installation. The will confirm proper operation of the
unit and if they are recorded, serve as a benchmark in troubleshooting
should difficulties appear in the future. These measurements are:
• Transmitter Power Output
• Antenna System SWR (Standing-Wave Ratio)
• Antenna Direction Optimization
• Bytes In On Port • Bytes In On Socket
• Bytes Out On Port • Bytes Out On Socket
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