ELVA-1 PPC-1000, 40.5-43.5 GHz Radio Links Undergo Dramatic Design Changes

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ELVA-1 Millimeter Wave Division, a world leader in ultra high speed digital wireless communications technologies, recently introduced an improved version of its certified 40.5-43.5 GHz Gigabit Ethernet radio link.

ELVA-1 Millimeter Wave Division (http://www.elva-1.com) has endowed its new PPC-1000 40.5-43.5 GHz radio link models with some striking advancements. Users of the previous version had to physically position the separate receiver and transmitter at each end of the radio link, each with its own antenna, to isolate the receivers from the transmitters' interference. Tedious operational isolation measurements were required to achieve the optimum positioning, because the mandated 2 GHz transmit-receive frequency separation was too close to resolve interference problems with normal filter technology. The new version uses an advanced filter design that allows the transmitter and receiver to be integrated into one transceiver housing.

This revised PPC-1000 radio link retains the same operating parameters of the original design, providing interconnection between remote digital network segments at the ultra high gigabit Ethernet data rate of 1.25 Gbps, and producing -12 dBW Tx output power and -94 dBW Rx sensitivity, with a BER of 10-6. It also boasts an operating distance of up to 12 miles (20 km), depending on rain density, and full functionality over an environmental temperature range of -40 to +50 C (-40 to +122 F). The new version still retains its SNMP control function, which allows a network administrator or technician to remotely control the operating parameters of all radios in the network from a central location. All PPC-1000 models use a QPSK carrier modulation scheme, which allows more efficient use of frequency channels and greater power density, resulting in excellent signal performance over longer distances. The same modulation scheme is used for television transmissions from satellites to Earth.

The new integrated transceiver design offers more than technical advancements. By combining the transmitter and receiver into one unit, the weight of one radio and antenna is removed from the mounting mast, and occupied space is reduced by one-half. The logistics of mounting a single transceiver unit are also much simpler than having to achieve the necessary spatial isolation between a separate transmitter and receiver. The transceiver configuration greatly increases system reliability by reducing the number of circuits, cables and connections, as well, and results in less physical installation time, which is of special importance in severe weather.

Operational advantages common to PPC-1000 systems in all offered frequency bands are included in the new 40.5 to 43.5 GHz design, such as a pencil-thin antenna beam width of 0.7 degrees at -3 dB power level, with side lobe suppression of more than -15 dB. This narrow beam width eliminates annoying signal multipath conditions from reflections off of adjacent buildings, walls and rooftops, and allows a user to continuously operate several of these radio links in a limited area, without interference.

PPC-1000 radio links are not active network systems, so they carry a network data stream transparently, in the same manner as a fiber optic cable that is physically connected from one node to another. This transparency also applies to any data control features such as forward error correction (FEC). The link's large data transmission capacity enables service providers to offer a vast range of services, including Triple Play, defined as the transmission of IPTV, video on demand and VoIP services at the same time.

Digital radio equipment in the 40.5-43.5 GHz millimeter wave range is currently rare, because of the design challenges at these frequencies. However, the wide, 3 GHz band available in this range enables broadband communications by allowing increased channel size and data transmission capacity. ELVA-1 currently holds a unique position in the radio market by offering government agency certified radio links for broadband wireless data transmission in the 40.5-43.5 GHz millimeter wave frequency band.

ELVA-1 was also the first company in the world to produce a gigabit capacity 71-86 GHz digital radio link that was specifically designed to meet both European ECC and US FCC performance requirements, and offers certified radio links for use in those markets. The pattern diagram of PPC-1000 series antennas meets the precise mask requirements of both FCC and ETSI. Actual performance differs little from theoretical prediction, and is well within mask limits, with room to spare.

Until recently, only fiber optic systems were capable of 1.25 Gbps data transmission rates. However, some millimeter wave radio links now allow service providers to quickly and easily extend many digital services, including Triple Play, into areas that are difficult or costly to connect with new fiber optic cable. The PPC-1000 series' gigabit Ethernet, fiber-class data capacity, ease of installation, superb quality of service and affordable cost make our millimeter-wave radio links ideal solutions for WiFi or cellular telephone network extension and backhaul links, business WAN or IP telephony gateway connections, MAN metropolitan area networks and rapid-deployment emergency communications.

About ELVA-1 Millimeter Wave Division:
Founded in 1993, ELVA-1 Millimeter Wave Division is a privately-held, internationally renowned manufacturer of millimeter wave integrated components, subsystems and test equipment. In 2000, ELVA-1 aggressively expanded its product range into millimeter wave telecommunications products, such as 40.5-43.5GHz, 71-86GHz and 94GHz transmitters and receivers, high gain antennas and other advanced millimeter wave wireless communications products. A complete overview of ELVA-1's capabilities can be accessed at http://www.elva-1.com.

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