Sub10Systems Professional Services

Case Study – E1000 Installation (80Ghz)! John%Golding%+%Sales%Engineering%Director%+%Sub10Systems%%David%Lincoln%–%Director%–%TekNet%Ltd%%%%%%%%%%%%%%%%%%%!

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!!Sub10!Systems!Limited!

Ash%House%Canal%Way%Kingsteignton%Newton%Abbot%TQ12%3RZ%United%Kingdom%Telephone:!+44%(0)1626%818520!Email:!!!!!!!!!info@sub10systems.com!Web:%%%%%%%%%%%www.sub10systems.com!

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Table&of&Contents&

Introduction ..................................................................................................................... 3%Link!Profile................................................................................................................................ 4%Link!Budget............................................................................................................................... 6%

Installation....................................................................................................................... 7%Link!setup,!after!alignment ....................................................................................................... 8%An!example!of!ATPC!working .................................................................................................... 9%

TekNet!Throughput!Tests ................................................................................................12%E1000!System!Specification......................................................................................................17%

Conclusion ......................................................................................................................18%

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Introduction!!!This%case%study%covers%preparation,%installation%and%performance%testing%of%a%Liberator%E1000%link%installation.%%An%added%bonus%is%an%illustration%of%the%effects%of%heavy%rainfall%on%performance%of%the%link,%with%Automatic%Transmit%Power%Control%(ATPC)%enabled,%soon%after%installation%had%been%completed.%%Link%throughput%testing,%on%the%bench%and%over%the%installed%link,%is%described%in%detail%on%pages%11%to%14%inclusive%and%requires%the%use%of%two%Laptops%with%Gigabit%Ethernet%ports,%ideally%running%Linux%and%assumes%an%installer%has%some%experience%of%using%the%applications:%Netcat,'iPerf'or'jPerf.%Please%see%Page%12%for%more%details.%

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Link%Profile% The%installation%is%located%at%Bournemouth%University%in%the%south%of%the%UK,%Bournemouth%is%a%coastal%town%which%experiences%weather%patterns%which%routinely%come%directly%from%the%Atlantic%Ocean;%this%provides%a%wide%and%challenging%range%of%meteorological%conditions%for%RF%propagation%at%E%band.%%Link%length%was%measured%at%2,945m%(1.83%miles),%with%absolute%Line%of%Sight%(LOS),%owing%to%Outdoor%Unit%(ODU)%mounting%positions%being%at%or%above%roof%level%on%separate%buildings,%both%approximately%24%metres%(80%feet)%high.%%Link%Path%%%

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%LOS%Photos,%showing%mounting%positions%(in%red).%%

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Link%Budget%

%Both%A%and%B%end%radios%were%installed%after%a%remote%evaluation%of%the%link%path,%using%Google%Earth%and%other%parameters%input%to%the%Sub10%Link%Estimator%+%Sub10+Liberator_Link_Estimator+v1.8.zip%Link%availability%was%estimated%at%99.98%%using%the%smallest%35cm%antenna%offering%a%gain%of%48dBi,%this%choice%was%made%for%aesthetic%and%planning.%%Had%it%been%possible%to%use%the%optional%65cm%antenna,%an%improvement%of%8dBm%Fade%Margin%would%be%seen,%this%roughly%translates%to%an%additional%km%(0.62%miles)%in%range%for%the%same%availability%or%well%over%99.99%%Availability.%%%*Note%

Inputting%link%type,%position,%antenna%size%(35cm),%polarization%(Vertical%in%this%case),%link%distance%and%a%worst%case%rain+rate%of%40.5mm/hour%to%the%Sub10%Link%Calculator,%gave%an%estimate%of%99.98%%availability.%Thus%far,%this%prediction%is%proving%to%be%accurate.%%Accordingly,%when%rainfall%levels%are%below%the%worst%case%figure,%availability%will%be%99.99%%or%higher.%

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Installation!A+End%

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Link%setup,%after%alignment%

%After%mounting%and%applying%power,%ODU%are%placed%in%manual%power%mode%and%set%to%a%static%level,%in%this%case,%of%15dBm.%%They%can%then%be%roughly%aligned,%using%optical%means.%%The%optical%alignment%phase%is%designed%to%ensure%an%acceptable%level%of%RF%is%captured,%in%order%that%fine%alignment%can%begin.%%Fine%alignment%is%achieved%by%carefully%moving%the%ODU%in%small,%precise%horizontal%and%vertical%search%patterns,%using%choice%of%3%available%methods%until%maximum%signal%is%received:%%(1)%DC%Volt%meter%output%(2)%GUI%RSL%Output%(3)%An%audible%tone%generated%by%the%ODU.%%Our%recommendation%is%to%use%a%combination%of%all%three%methods%to%obtain%the%predicted%signal%strength%for%this%installation%(+35dBm)%derived%from%the%link%estimator.%%Once%fine%alignment%is%complete,%ATPC%is%turned%on%and%the%link%will%settle%to%power%levels%of%a%steady%+50dBm,%regardless%of%weather%conditions%and%other%interfering.%Its%worth%mentioning%at%this%point%that%although%we%didn’t%Capture%the%link%data%from%the%24thSeptember,%the%link%did%operate%through%a%major%weather%event%which%flooded%many%parts%of%the%UK%%factors.%%

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An%example%of%ATPC%working%

%RX%Level%

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%TX%Level%–%Controlled%By%ATPC%%

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The%offending%(very%heavy)%Rain%event%.%%%%%%%%%%%%%%%%%%%%%%%

Bournemouth%%%%

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TekNet!Throughput!Tests!%In%September%2012%TekNet%Ltd%installed%and%commissioned%the%first%SUB10%E1000%80Ghz%(E%Band)%Gigabit%Ethernet%Point+to+Point%link%in%the%UK.%%The%test%procedures%used%to%validate%the%performance%of%the%link%follow:%%

%%Before%running%any%tests%over%an%installed%link,%it%is%recommended%a%bench%test%is%done%to%establish%the%maximum%data%throughput%possible%when%connecting%the%laptops,%back+to+back,%with%a%short%Ethernet%patch%cable.%%The%results%obtained%will%be%the%benchmark%for%the%field%test.%%Bench%testing%was%performed%using%a%pair%of%Toshiba%Tecra%8000%laptops%running%Ubuntu%Linux%12.04%LTS,%and%with%Gigabit%Ethernet%cards.%%It%is%recommended%that%Linux%is%always%used%for%testing,%as%Windows%simply%can’t%address%the%network%card%fast%enough!%The%test%method%followed%was:%

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%%The%first%laptop%‘dot1‘%is%given%the%IP%address%192.168.1.1/24%%%%On%this%laptop%a%1GB%file%of%random%data%is%created%called%test.random%using%the%command%dd'if=/dev/urandom'of=test.random'bs=1M'count=1000

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%%%The%second%laptop%is%named%‘dot2′%and%given%the%IP%address%192.168.1.2/24.%%The%two%laptops%are%then%connected%directly%(not%via%a%switch)%using%a%1m%length%of%Cat5e%Ethernet%patch%cable.%%On%the%second%‘dot2‘%%laptop%netcat%%is%used%to%listen%for%data%on%port%10000%and%discard%data%received%by%piping%the%output%to%/dev/null%%%It%is%important%to%pipe%the%output%to%/dev/null%in%order%to%eliminate%any%delays%due%to%disk%writes%etc.%%Also,%it%should%be%noted%that%transfer%speeds%reported%by%netcat%on%the%‘dot2′%laptop%can%be%ignored,%as%this%computer%simply%reports%the%amount%of%data%received%between%the%time%the%nc'<l%command%was%issued%and%the%time%the%command%was%terminated%–%Note,%it%can%be%several%minutes%before%it%will%be%possible%to%issue%the%command%on%the%‘dot1′%machine%to%transfer%the%file!%%

%%With%the%‘dot2′%laptop%waiting%to%receive%the%data,%the%1GB%%test.random%file%is%transmitted%from%the%‘dot1′%laptop%using%the%command%dd'if=test.random'|'nc'192.168.1.2'10000

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%%The%scripts%seen%should%to%show%that%the%1GB%file%is%transmitted%in%under%9%seconds,%at%a!transfer!speed!of!117!MBytes/s.%Now%for%a%little%bit%of%maths:%1MByte%=%8,192000%bits%(1,024%x%1,000%x%8)%117MByte/s%=%%958,464,000%bits/s%of%data%throughput.%

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%1500%Byte%MTU%payload%to%header%ratio%=%95.18%%1,000,000,000%x%95.18%%=%951,800,000%bps%expected%payload%throughput%%(Note%that%the%actual%data%rate%on%the%link%is%even%higher,%as%it%is%fair%to%assume%that%there%is%a%7%%overhead%for%TCP%headers%etc.,%but%for%these%tests%only%actual%data%throughput%is%of%interest.%%The%next%step%is%to%directly%connect%a%pair%of%Netgear%Gigabit%Ethernet%switches%(model%GS724TP),%via%single%mode%SFPs%and%a%long%fibre%patch%cord.%%One%laptop%was%connected%to%each%switch%and%the%tests%above%repeated.%%%Once%again,%a%transfer%speed%of%117MByte/s%was%recorded,%proving%the%switches%did%not%introduce%any%delay.%Switch%delay%does%not%cause%a%drop%in%throughput.%(Unless%the%TCP%window%size%is%exceeded)%%Bench%test%preparation%produced%the%results%and%confidence%necessary%to%move%outside%for%the%actual%installation.%The%E1000%link%was%set%up%between%two%multi+storey%buildings,%with%a%link%distance%of%exactly%2,945m.%%The%single%mode%fibre%interface%at%each%end%of%the%link%was%connected%to%each%of%the%Netgear%gigabit%switches,%with%the%laptops%plugged%in%to%each%one%of%them.%%The%weather%conditions%on%the%day%of%the%test%(18th%September%2012)%were%dry%and%sunny.%%Replicating%the%bench%tests%given%above,%resulted%in%an%identical%transfer%speed%of%117MBytes/s,%leading%to%the%conclusion%that%in%dry%conditions%the%link%speed,%over%the%wireless%path,%is%no%different%to%a%1%metre%patch%cable.%

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%%%In%addition%to%the%Linux%based%tests%described%above,%iperf%based%tests%were%run%over%the%same%link.' 'With'iperf,'data%throughput%speeds%were:%%%110%MBytes/sec%(922%Mbits/sec)%throughput%using%a%single%data%stream,%and%109%MBytes/sec%(913%Mbits/sec)%using%two%concurrent%streams.%%Single%Stream:%

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Licensed Link Quality of Service, But Lightly Licensed! The Sub10 Liberator-E1000 is an extremely versatile and cost effective P2P wireless Ethernet link operating in the 70/80GHz band (E-band). Quality Design and engineering provide carrier grade availability for large and small network operators or individuals.

Features & Benefits

Applications

• Lightly Licensed • Plug and Play • Full Duplex Gigabit Ethernet (1Gbps) • Selectable Optic/Electric interface • Typical link distance 5km for 99.99% • All outdoor design (0.3m or 0.6m antennas) • Inherently secure • Quick to Install

• Fibre alternative

• LAN extension

• Path redundancy

• Campus connectivity

• Disaster recovery

• Leased Line Replacement

• Temporary connections

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Liberator-E1000 "Fiber over Air" in E-band!

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%%%System%Specification%!

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Dimensions (ODU): • Size: 25.5x30.9x17.5 cm • Weight: 6.5kg

0.3m Antenna: • Diameter: 35 cm • Weight: 8.1kg • Installation Mast: 42 – 120mm

0.6m Antenna: • Diameter: 65 cm • Weight: 11kg • Installation Mast: 42 – 120mm

Regulatory • EN 60950, ETSI EN 302 217-3, EN 301 751,

ECC Rec. (05)07

General system information: • Modulation: DBPSK • Frequency: 71-76 / 81-86 GHz (E band) • Channel Width: 1,500MHz • Antenna gain: 0.3m 48dBi

0.6m 52dBi • TX power: +20dBm (Max at Antenna Port) • Sensitivity: - 63dBm (BER=10-6) • FEC: Reed-Solomon • Latency: < 8µs • System Configuration: 1+0, 1+1 • Wind load: Operating 120km/h

Survival 200km/h

Power supply: • Power: 36-72V DC • Power Consumption: up to 40W at 48V Operating temperature: • ODU: -33°C to +55°C • Protection Box: -5 °C to +50°C User Interface: • Interfaces: 2x1000Base-T, IEEE802.3z • Option: Fiber optic 1000Base-SX/LX Management • Serial (RS-232): Diagnostic Channel • SNMP: ver 1 • Others: Proprietary Management

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Conclusion!%The%E1000%Millimetre%Wave%(mmW)%solution%is%ideal%for%high%capacity%Point%to%Point%connections%where%its%either%too%expensive,%too%time%consuming%or%physically%impossible%to%deploy%a%fibre%optic%cable.%With%better%range%and%weather%performance%than%Free%Space%Optics%(FSO),%it’s%a%clearly%a%viable%alternative,%offering%a%practical%and%cost%effective%choice%of%technology%when%high%capacity,%robust%infrastructure%is%required.%%%%%%%%%%%%%%%%%%Contact Information: Testing undertaken by TekNet Ltd Tel: 0800 756 9798 Email: info@teknet.uk.com Web: http://teknet.uk.com

Sub10 Systems Limited Ash House, Canal Way, Newton Abbot, Devon, TQ12 3RZ, United Kingdom Telephone: +44 (0)1626 818520 E-Mail: info@sub10systems.com Web: http://sub10systems.com %