MRV Communications TS800/155, TS700/155, TS700/100, TS700/G Appendixf Effect of Wind on Terescopes

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M R V C o m m u n i c a t i o n s , I n c . – I n s t a l l a t i o n M a n u a l

APPENDIXF Effect of Wind on Terescopes

Introduction

The outdoor environment in which our devices are normally placed exposes the link to wind pressures that may affect the accuracy of the link’s alignment.

Several factors play a role in the determination of the extent to which the directionality of a TS device may be affected by the wind:

Wind speed Wind direction

Surface area of device perpendicular to wind Mechanical stability of aiming head – device system.

For example, the mechanical stability is greatest along the side-side axis of the device. Although the surface area along the side of the device is greatest, the resultant wind force

–even at very high wind speeds – will barely have an impact on the beam’s direction, due to the rigid mechanics along the side-side axis.

Wind Limits for TS Devices

All TS devices have been tested in “worst-case” scenario of the above four factors. The force necessary to deviate beam was measured from different direction.

From here1, the minimum wind speed with maximum effect on beam deviation was determined.

The following table lists the minimum wind speeds for different TS products that may cause:

A momentary lapse in the communication.

An extended lapse requiring mechanical repair.

 

TS Device

Momentary

 

Extended

•

10” (E&F models)

110 km/hr

 

200 km/hr

•

10” with Windproof-L

Over 180 km/hr

 

Over 250 km/hr

 

Accessory

 

 

 

 

 

• 4” (B,C, D models)

150 km/hr

 

Over 250 km/hr

•

4” with Windproof-S

220 km/hr

 

Over 300 km/hr

•

Light (A&C2 models)

150 km/hr

 

Over 250 km/hr

•

PAL (TS1)

180 km/hr

 

Over 250 km/hr

• 8” (Models D2, E2, G)

 

150 km/hr

1We include here the formula for calculating the effective wind force on a flat surface, given a known wind speed:

Wind Force = 0.79 x (Wind Speed)2 x (Area of Surface)

For instance, assuming a wind speed of 27.78 m/s (equal to 100Km/hr) on a surface area of 0.04m2 (400cm2), the force is equal to 24.4 Newtons.

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Contents UserManual UserManual TableofContents P E N D I Standards Compliance StandardsFCC Notice CE MarkOther Standards MRV  Laser Safety CertificationDisclaimer TrademarksAboutthisUserManual Before Installing SafetyRequirementsServicing Introduction Carefully Read the Entire Manual Before InstallingUsing the Part Number for Ordering TheProductModels Part Number Description Front MRV Back Panel Description TS800/155 Standard Model DS1 Toggles Data Rate DIP switch TS800/155-F Standard Model including Fusion option RF Transceiver Fusion Operation Mode5b TS & Fusion FusionTS700/100 Fast-Ethernet System OFF Auto-negotiation, on Forced MRV Display LEDs,Dry Monitoring and Management options ManagementDry contact Only TS800 Typical Connection Fiber ConnectionCopper Connection Line of Sight SiteSurveyOrientation Location & RangeConsult Factory in Case of Doubt Optimal Mounting Unacceptable Mounting Mounting Environment & StabilityPage Transmitting through a Window Wall Mounting using JMP and JMB12 shows the arrangement for transmitting through a window Power Data/Signal CablingInfrastructure Handle the Fibers Very Carefully BenchTest SetupCompatibility Test equipmentTS700/100Fastethernet IR link Bench testDisplay and Results IndicatorsExpected Results Received powerInstallation AccessoriesDescription TereScope Parts External view Part DescriptionAiming Head Adjustment and Locks Installer Tool Kit JITK-L MountingDetachment of the TS from the JMP-L Standard position a Mounting the accessoriesMounting on the floor Special MountingJMP-L Mounting on a fragile/crumbly wall17 Alignment kit mountedon JMP-L Back view Attachment of the Transceiver TereScope HeadPowering on the TereScope AimingProcedureTransceiver Alignment ProcedureGeneral Tools and EquipmentFine Alignment 13 Position after the horizontal aiming 15a and 6.15b Alignment screws Link Operating Test InstallationCompletionBefore Closing the Rear Door Visual Inspection17 Mounted TereScope Left View Maintenance Accuracy should be examined and restored if necessaryPeriodic Visits Appendix a TS700/100 Fast-Ethernet Light TS800/155 high speed Light TS700/G Giga-Light Appendixb Packing box contains AppendixcAppendixd List of the Tools Supplied by MRV Communications Where to usePoints to Remember Introduction Interference Figure E.3 Active Transmitters Shown Darkened Page Appendixf Effect of Wind on Terescopes FSO Chaining AppendixGIndirect Chaining Use the indoor switch in building C for the chainingFSO products & Chaining Product series No of chained links Appendixh Site survey Installation System failure Appendixi
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