Deployment
In conjunction with the RSSI command, it is also useful to perform the apsearch command that will tell you which AP is providing an adequate signal at the location of the SU.
AP Search
1.Ensure AP is in Opmode “On.”
2.Run the apsearch command to verify which AP is providing the strongest signal strength.
#> apsearch
Press [space] then [enter] to stop
In this example, an AP is detected on channel 1, polarization horizontal. Further, the Base ID is 1234, and the MAC address is 00 01 DE 15 5C D0.
1 | 906 | Hz | 1234 | DE 15 | 5C | D0 | [H: | dBm] [V: | dBm] [E: | dBm] | |||
2 | 912 | Hz | FF FF FF | FF [H: | dBm] [V: | dBm] [E: | dBm] | ||||||
3 | 918 | Hz | FF FF FF | FF [H: | dBm] [V: | dBm] [E: | dBm] | ||||||
4 | 924 | Hz | FF FF FF | FF [H: | dBm] [V: | dBm] [E: | dBm] |
RSSI Command for Antenna Alignment
Step 1 Telnet into the SU (while in Opmode “OFF”). Use the freq and antenna command to note the radios current settings.
Step 2 Run the rssi command. The telnet session screen will begin a continuous readout of the received signal strength. As you read the RSSI reading, move the antenna in the horizontal and vertical planes until the maximum RSSI reading is achieved. To allow for plenty of fade margin, we recommend a continuous RSSI reading of
Example 1 has the wrong freq and antenna settings: #> rssi
[ | 1] | peak | avg | ||
[ | 2] | peak | avg | ||
[ | 3] | peak | dBm | avg | dBm |
Example 2 has the correct freq and antenna settings: | |||||
#> rssi | peak | dBm | avg | dBm ** | |
[ | 1] | ||||
[ | 2] | peak | dBm | avg | dBm *** |
[ | 3] | peak | dBm | avg | dBm **** |
Step 3 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
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.
SU Alignment Using LEDs
The LED RSSI indicators on the bottom of the radio provide a handy alignment tool. If all four LEDs are lit, the unit is receiving
Lit LEDs | Signal Strength |
|
0 LED |
| |
1 LED |
| |
2 LED |
| |
|
| |
Trango Broadband Wireless — User Manual M900S Rev C | Page 34 |