SEL-3031 Instruction Manual Date Code 20181001
Performance Monitoring, Testing, and Troubleshooting
Monitoring Radio Performance
5.2
radio is installed. The RSSI value should match to the results of the path study. If the
path study numbers do not match the actual results then either the data entered is
incorrect or information about the locations was omitted. Contact SEL if you cannot
get the calculated values to match the measured values.
RADIO 1 Date: 09/11/2009 Time: 10:54:26
STATION_A Time Source: Internal
RSSI
-46 dBm
AVAILABILITY: From 09/11/2009 10:53:50
Overall
100.00 %
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5
100.00 % 100.00 % 100.00 % 100.00 % 100.00 %
Zone 6 Zone 7 Zone 8 Zone 9 Zone 10
100.00 % 100.00 % 100.00 % 100.00 % 100.00 %
Figure 5.1 Example RAD Command
If you are using directional antennas, verify they have identical orientation—both sides
must be either polarized horizontally or vertically. Typically, a vertically polarized
antenna will give better results than a horizontally polarized antenna. If the location of
the radio antenna is shared with other antennas operating at the same frequency, then
proper spacing and opposite polarization should be used on one set of the antennas,
along with using the SKIP setting. If two or more SEL-3031 radios are collocated
using SEL Hop-Sync, see Configuring Collocated Antennas Using SEL Hop-Sync
Technology on page 3.16. See Section 2: Installation for more information on antenna
installation. Check the aiming of the antenna while updating the RAD command until
you get the strongest signal. This will require two people, where one person is moving
the position of the antenna in small increments, while the other is monitoring the RSSI.
The antenna position must be rotated on both sides to obtain the highest signal
strength. The RSSI must also be reviewed on each radio. The receive strength on the
remote radio will likely be different than the received strength on the master radio.
The last step to check is the availability of the radio link. The RAD command gives the
overall availability of the link. For protection systems the desire is to have a radio link
between 95 and 99.95 percent availability. This overall availability number is a great
way of directly obtaining this number. If you are running M
IRRORED BITS then use the
availability number in the communications report in the M
IRRORED BITS device.
NOTE: The radio and the MIRRORED BITS report measure
availability differently. Use the radio availability numbers
for proper radio installation. Use the M
IRRORED BITS
communications report numbers when measuring the
overall availability of your protection or control
communications channel.
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