Founded 1990 Located in Lancaster NY (near Buffalo) Systems integration and wireless technology development history.
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2 Founded 1990 Located in Lancaster NY (near Buffalo) Systems integration and wireless technology development history. Acquired assets and exclusive rights to Aria Wireless and GLB Electronics product line 2001 Product history is SCADA and high reliability telemetry for government and military applications as well as vehicle location. Entered traffic market in 2004 with products based on proven core wireless technology.
3 Traffic Control Card cage, wide band radios, GPS timing and other traffic related functions. Lottery/Banking Integrated radio/antenna, patented CEMA protocol. SCADA Contact closure radio, VHF/UHF, hazardous environments. AVL/GPS AVL Controller, bandwidth efficient protocol Military/Govt Semi-custom variants of standard products.
4 Interconnect controllers at street Intersections Bridging Wire-line Interconnects Traffic light status, alarm status Time synchronization (GPS or radio) New schedule download. Contact closures, pre-emption Control of programmable signboards Custom logic/algorithm capability (eg. Crosswalk)
5 ! Eagle, Econolite, Naztec, Peek, Siemens etc. 170, NEMA, 2070, ATC Any controller with multi-drop protocol and Asynchronous interface Any controller with Ethernet interface Second by second control
6 " DataMover # $! DataMover DataMover I/O ODU (RS232) SS Traffic WB (Ethernet) DataMover 170 T(M) DataMover ATC/2070 DataMover DR(M)
7 % &!' (" #' )
8 % &!' (" #' ) Fire House based solution DM SS 900 or 2400 MHz Galvanic isolation from intersection Preempt 1 to 5 Routes 1 to 5 intersections per route In fire hall or outdoor antenna supported
9 " *++,-! '! " RF power control in 1 db steps (not 10 db steps!) Can lock out up to half of frequencies. Co-located or closely located Masters with no cross interference. Repeater with fail safe (self healing network) Over the air diagnostics with system running Logging spectrum analyzer
10 " #& Ethernet Mbps 900 / 2400 / 4900 / 5800 MHz 12.5, 20 or 23 dbi integral antennas Integral and External Antenna versions Dual radio capability 5, 10, 20 or 40 MHz Channels Split antenna capability POE, power supply and mast clamp included Router or bridge capability. Multiple video stream mode.
11 ' () Once per day GPS accurate time synchronization Controller specific time/date message Once per day contact closure Vandal resistant Quick installation Electromechanical controller mode Serial messages for Siemens (epac), Econolite and AB3418 compatible Controllers L version is GPS antenna only (NMEA GPRMC message)
12 The Link Budget and Fade Margin Fresnel zone clearance Frequency, 900 MHz vs 2400 or 5800 MHz RF Interference Antennas Spectrum analyzer
13 !!!&!%! For best range and interference rejection Use the narrowest bandwidth possible Use the lowest speed possible.
14 .&!!! Link Budget Like a balance sheet where you have parameters that add to or detract from your to have a viable link. The units of measure are db, and dbm GOOD: RF power, antenna gain, more receiver sensitivity. BAD: cable losses, distance, higher frequency.
15 .&!!! Fade Margin (a.k.a System Operating Margin) The bottom line of the Link budget. The number of db that the link exceeds or fall short of providing a viable link. + is good - is bad. The MATH Free Space Loss = 20Log10(Frequency in MHz) + 20Log10 (Distance in Miles) RSL = Tx Power - Tx Cable Loss + Tx Antenna Gain - FSL + Rx Antenna Gain - Rx Cable Loss
16 .&!!!
17 !/'!! What if measured RSSI (signal strength) is less than the predicted received signal level? This difference is called unmodeled error. Reasons: Foliage Fresnel loss due to terrain or buildings Other more complex NLOS loss Catalog these unmodeled error types to build your RF path engineering experience. You can then more easily predict path viability without need of a link test.
18 0 Edge diffraction Like a balance sheet where you have parameters that add to or detract from your to have a viable link. The units of measure are db, and dbm GOOD: RF power, antenna gain, more receiver sensitivity. BAD: cable losses, distance, higher frequency. Fade Margin (a.k.a System Operating Margin) The bottom line of the Link budget. The number of db that the link exceeds or fall short of providing a viable link. + is good - is bad.
19 0 Direct visual path (line of sight) is important but it is not enough. r increases for lower frequencies or longer distance. Fresnel Zone = 72.1 * Sqrt (dmi / (FreqGHz * 4))
20 0
21 1 2*++# ,- Higher frequencies Less Fresnel zone clearance required. More antenna gain with a specific physical size of antenna. Better antenna directivity with a specific size of antenna. Shadowed or blocked more easily in most cases. Better frequency reuse because of the ability to use narrow beam width antennas. Lower frequencies For the same RF power EIRP and gain of antenna, allow a better link budget. Have less allocated (unlicensed) spectrum
22 1 2*++# ,- With all parameters equal, 915 MHz has ~8.5 db advantage over 2440 MHz. With all parameters equal, 915 MHz has ~16 db advantage over 5800 MHz. 900 MHz is good for low bandwidth long range applications provides excellent directivity (frequency reuse) and wide bandwidth.
23 Co-channel - same channel Desensitization nearby band eg. pagers Intermodulation mixing of 2 signals co-channel
24 '! Steer the null of antenna to suppress co-channel or desensitization interference Use attenuator to reduce intermodulation
25 Gain, dbi vs db vs dbd Beamwidth vs gain. Clearance to pole or nearby objects. Clamp to element clearance Use signals from rear of yagi antenna Splitters. Lightning Arrestors
26 Gain, dbi vs db vs dbd 9 dbd = 11 dbi (2 db difference) Beamwidth vs gain. Narrow beamwidth = higher gain
27 Clearance to pole or nearby objects. 18 inches for 900 MHz yagi ½ panel dimension for panels. Increase distance for objects in front of antenna. Mast clamp to Yagi element clearance As far as possible
28 Use signals from rear of yagi antenna Front = 9 dbd, rear = -16 dbd
29 Splitter 3.25 db loss for each antenna Consider using rear of yagi. 2 way antennas available but higher cost. Lightning arrestor Low cost = high feed through 300V to 600V typical Higher cost = low feed through 3V to 10 v peak typical
30 !' Sensitivity -108 dbm 1e-6 BER = -110 dbm 1e-5 BER FEC and retries improves the rating. Many manufacturers state sensitivity with retries and FEC turned on. RF Power Control 10dB vs 1 db steps BER > Bit Error Rate
31 Radio configuration software Remote Diagnostics WEB RF path analysis tools Real time spectrum analyzer WEB tools at free tools
32 '- Horizontal vs vertical polarization noise floor Out of band vs in band signals. Desensitization test. Recording all sweeps and results to file.
33 7 PHOENIX HIGHWAY PRODUCTS SIMREX CORPORATION
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