Trango Broadband M900S user manual ARQ with Selected Repeat and Multirate Feature

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Management

The “r” is used in this command to repeat the RF link test repeatedly until the user terminates the test by hitting SPACE ENTER.

Example:

#> su testrflink 88 r

Press [space] then [enter] to stop

 

[len] 1512

 

 

 

[suid] 88

[AP Tx] 20

[AP Rx] 20 [SU Rx] 20

[

0]

[

1]

[AP Tx] 20

[AP Rx] 20 [SU Rx] 20

[

2]

[AP Tx] 20

[AP Rx] 20 [SU Rx] 20

[

3]

[AP Tx] 20

[AP Rx] 20

[SU Rx] 20

[

4]

[AP Tx] 20

[AP Rx] 20

[SU Rx] 20

[

5]

[AP Tx] 20

[AP Rx] 20

[SU Rx] 20

Success.

As another example, a result of 20..10..18 would indicate 20 packets sent from the AP, 18 packets received at the SU, and 10 packets received back at the AP. You might expect this type of results from Fresnel zone infringements, interference, or multi-pathing.

ARQ with Selected Repeat and Multirate Feature

The M900S features ARQ or “Automatic Request for Re-transmission,” which provides the ability to correct for missing or corrupted packets of data by asking the sender to re-transmit the data.

Both the AP and SU units implement a form of ARQ known as “ARQ with Selected Repeat.”

The units makes a first attempt at transmitting a data frame using the 3.250 Mbps rate. Then, if a re-try is required, the 2nd attempt will also be at 3.250 Mbps. The 3rd and 4th attempts will be at a rate of 1.625 Mbps. After the 4th attempt there will be no more re-tries and a counter describing “maximum retries reached” will be incremented.

A minimum of 100ms is placed between re-transmission requests.

The units buffer up to 600 frames, or 4 seconds worth, of RF TX Data frames to support the ARQ algorithm.

The AP unit maintains counters concerning the ARQ algorithm on a per SU basis. The counters include the following data:

Total Transmitted Frames Total Retransmission Attempts Total “Maximum Attempts Reached”

The SU unit maintains counters concerning its use of the ARQ algorithm. The counters include the same data as in the AP.

Trango Broadband Wireless — User Manual M900S Rev C

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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 Basic Configuration via Browser Interface Configuring the AP’s Subscriber Unit Database SudbThis section you will 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 Command survey time antenna DeploymentSite Selection AP Search and SU Antenna Alignment Example\Rssi Command for Antenna Alignment SU Alignment Using LEDsAP Search 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 SnmpObjects for Monitoring and Control SU Bandwidth MonitoringAP 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