User's Manual

TrangoFOX™ Subscriber Unit User Manual
Trango Broadband Wireless
Page 16
Weather Considerations
It is imperative that the radio be COMPLETELY SEALED when in use. Take care to ensure that the boot and foam
insert are properly installed on the bottom of the radio. Without proper sealing, moisture may enter the radio and
potentially cause damage which will not be covered under warranty.
Access to the radio RJ-45 Port and LED status lights are purposely located at the bottom of the radio to minimize the risk of
water intrusion. Do not mount the radio upside down.
! Note: The J-Box is not a weatherized device and must be located either indoors or in a weather-protected cabinet.
Antenna Alignment
The four LED RSSI indicators on the bottom of the radio provide a handy alignment tool. If all four LEDs are lit, the
unit is receiving –60 dBm or stronger. If no LEDs are lit, there is not sufficient signal strength to establish a wireless
link.
LIT LEDs Signal Strength
0 LED -80 dBm
1 LED -75 dBm
2 LED -70 dBm
3 LED -65 dBm
4 LED -60 dBm
For more precise RSSI readings utilize the command line interface RSSI tool according to the procedure presented
below.
SU Antenna Alignment Procedure
1. Ensure AP is in opmode “AP”
2. Telnet into the SU
3. Type command RSSI <channel> <polarization> - Example RSSI 3 V (chan. 3, vertical polarization)
4. Telnet session screen will begin a continuous readout of the received signal strength.
5. As you read the RSSI reading, move the antenna in the horizontal and vertical planes until the maximum RSSI
reading is achieved. For short links you can expect an RSSI of –60 dBm or better. For longer links and RSSI
of –75 dBm is acceptable. Any RSSI of less than –80 dBm may be too weak for the radios to reliably associate
and pass data.
6. If it is not possible to receive an adequate RSSI reading, it may be necessary to reorient the AP (up/down,
left/right), to increase the output power of the AP, or to move the SU to a location with better line-of-sight
conditions to the AP.
Once you are satisfied with the RSSI reading, tighten down the SU in the optimum position. To stop the RSSI
continuous readout, hit SPACE ENTER.