Trango Broadband M900S AP Search, Rssi Command for Antenna Alignment, SU Alignment Using LEDs

Page 38

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:

-32

dBm] [V:

-50

dBm] [E:

-78

dBm]

2

912

Hz

----

FF FF FF

FF [H:

-80

dBm] [V:

-86

dBm] [E:

-99

dBm]

3

918

Hz

----

FF FF FF

FF [H:

-85

dBm] [V:

-86

dBm] [E:

-99

dBm]

4

924

Hz

----

FF FF FF

FF [H:

-82

dBm] [V:

-81

dBm] [E:

-99

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 -78 dBm or better. An RSSI of –88 dBm will allow you to establish a wireless link, but there may not be sufficient fade margin for reliable and continuous operation.

Example 1 has the wrong freq and antenna settings: #> rssi

[

1]

peak -80 dBm

avg -93 dBm

[

2]

peak -80 dBm

avg -97 dBm

[

3]

peak -99

dBm

avg -99

dBm

Example 2 has the correct freq and antenna settings:

#> rssi

peak -33

dBm

avg -74

dBm **

[

1]

[

2]

peak -33

dBm

avg -68

dBm ***

[

3]

peak -33

dBm

avg -64

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 line-of-sight conditions to the AP. Alternatively consider using external antennas on either the AP or SU or both.

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 –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

 

 

 

Trango Broadband Wireless — User Manual M900S Rev C

Page 34

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Contents M900S MHz Wireless Broadband System Table of Contents Table of Figures FCC Information Warranty Information Firmware NotificationsPreface CanadaIntroduction OverviewAuto-retransmit Feature ARQ SmartPolling & Bandwidth ThrottlingHardware Overview M900S AP and SU Hardware ComponentsConnections and Power Getting StartedRadio Management Concepts CAT-5Switch Settings Browser InterfaceBrowser Interface Login Web Browser System InformationCommand Line Interface Telnet ip address of radioTroubleshooting This section you will Basic Configuration via Browser InterfaceConfiguring the AP’s Subscriber Unit Database Sudb Creating an SU in the SU Database IP Address, Subnet Mask, Gateway Configure Other Basic AP ParametersDefault Opmode Active Channel/PolarizationBasic Configuration via Browser Interface Configure Basic SU Parameters SU Basic SetupLED Summary LED SummaryRF Link Loopback Test Link ControlAdvanced Setup SU Ranging TestOther Key Parameters Site Survey AP Parameter Description Related CLI Command Basic Configuration via CLIAccess Point Basic Settings Set baseid baseidIpconfig new ip new subnet mask new Set defaultopmode on or offSet defaultopmode on time sec Set apid apid 00-FF in HEXOn/off command Power set minmaxdBmSw 0 onoff default is on Sw 3 onoff default is offRemarks remarks Subscriber Unit Database Sudb SettingsSw 7 onoff default is on Sudb add suid prreg device id suid SU IDSubscriber Unit Basic Settings Basic Configuration via CLI Ipconfig new ip new subnet mask new SU Parameter Description Related CLI CommandSet defaultopmode on or off Set baseid baseidSw 1 onoff Antenna h v eSw 0 onoff Sw 2 onoffM900S Mounting Hardware Assembly Mounting HardwareAlternative Mounting Cabling and Grounding Considerations Standard Mounting Alternative MountingInstallation Notes Site Selection Command survey time antennaDeployment AP Search and SU Antenna Alignment Example\AP Search Rssi Command for Antenna AlignmentSU Alignment Using LEDs Link Management Commands Collocation and Channel PlanningSu ping su# Su su #Su linktest su# Su testrflink su#ARQ with Selected Repeat and Multirate Feature Management Radio Management Access Via TCP/IPSu password suid all rw ro new password new password SU Management from APLoading Multiple SUs into the Sudb using Dload Command SnmpAP Bandwidth Monitoring Objects for Monitoring and ControlSU Bandwidth Monitoring Snmp Setup Appendix a Command Set Reference Command Radio DescriptionCommand Radio Description Access Su ipconfig suid new IP new Command Radio Description Access Receiver Specifications Appendix B SpecificationsRadio Transmit Specifications Ethernet I/O Specifications Data Input/OutputConnectors/Indicators Power SpecificationsMechanical and Environmental Specifications General Standard External Power SupplyIntegrated Antenna M900S-SU and M900S-SU-EXT