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 Wireless LAN Bridge. PPC-1000 Gigabit Ethernet MM-wave Link.

In response to market demand for ultra-wide broadband communication equipment, ElvaLink offers a new PPC-1000 series of Gigabit Ethernet radios. The Gigabit ElvaLink radio bridge was designed for a wide range of applications such as mobile backhaul, business network, FSO backup, IP network and emergency recovery network.  It provides interconnection between remote LAN segments at ultra high speed and utilizes Gigabit Ethernet protocols, which is the evolving standard for switches and routers available from a variety of telecommunication equipment manufacturers.

    One full-duplex Gigabit Ethernet link provides 1.25 gigabit-per-second connectivity that is the equivalent of approximately 650 T1 lines or 1,000 DSL connections. The PPC-1000 product has 1000 Base-SX connections at each end of the wireless link and transparently establishes the link outputs. The resulting connection can replace a fiber-optics cable physically connected end-to-end. The wireless mm-wave Gigabit link provides fiber equivalent performance, reliability and security but with no high deployment cost associated with outdoor fiber installations. PPC-1000 links have remote management as well as parameter monitoring capabilities.

A twisted pair patch cable connected to any RJ-45 socket within the LAN will allow remote SNMP management and parameter control of a set of PPC-1000 links from a central location. The Gigabit Ethernet point-to-point millimeter wave radio links have been designed with compact parabolic Cassegrain antennas of 30 and 60 cm diameters. The 60 cm antenna has a 0.4° beam width and 50 dB antenna gain parameters. PPC-1000 equipment has been offered as a comprehensive link kit with antennas, mounting units and accessories to allow a turnkey installation into the customer’s communication system. The PPC-1000 operating distances vary from 1 to 4.5 miles or 1.5 to 7 km for varying weather conditions depending of the link frequency and rain intensity.

    Planning for millimeter wave spectrum use must take into account the propagation characteristics of radio signals at this frequency range. While signals at lower frequency bands can propagate for many miles and penetrate more easily through buildings, millimeter wave signals can travel only a few miles or less. However, these characteristics of millimeter wave propagation are not necessarily disadvantageous. Millimeter waves can permit more densely packed communications links, thus providing very efficient spectrum utilization, and they can increase security of communication transmissions.

PPC-1000 Gigabit Ethernet Point-to-point Link Specs

System Parameters  
Frequency Band 42 GHz (Q-band)
Bandwidth 40.5 - 43.5 GHz
Capacity 1250 Mbps Full duplex
Modulation Type DQPSK
Rx Sensitivity - 87 dBW
Output Power 20 mW
Network Management SNMP Enabled

Remote Parameters Monitoring

Proprietary adapter in ODU with software application [Windows 98/2000/XP]

Data and Aux Interface  
Ethernet Interface 1000Base-SX (for multimode fiber, Standard IEEE 802.3z/D.50-1998)
Diagnostics Port

RS-485 [with optional RS-232] or by Ethernet cable

Antenna Type Cassegrain type antenna with radome
Antenna Gain/beamwidth
60 cm

50 dB/04°
Power / Environment  
Power Supply AC

Input 88-132 / 176-264 Volts, 50/60 Hz [with manual voltage range switch]

Transceiver Power Consumption 65 W [+15W heating]
DC Power 36 to 60 Volts DC

Power Connector Ethernet / Power connector

IP-65 [optional IP-68]
Operational Temperature -40°C to 50°C / -40°F to 122°F
Humidity 0 to 95%, non-condensing
Physical Dimensions  
Outdoor unit size w/o antenna 330 x 350 x 460 mm
Weight (ODU w/o antenna) 14 kg max


In particular, when considering link availability levels (99.9% - 99.999%), heavy rain conditions are the principal factor in determining the actual operating distance of the link. This table shows link availability levels and relevant outage times per year. It has been proven experimentally that in actual practice the operating distance for a mm-wave link could be longer for the same availability than the above mentioned theoretical distance estimations. The explanation is that the distances are generally calculated assuming that rain intensity is equal along the entire distance. But rain cloud intensity varies along the distance between the link antennas. For instance, there might be heavy rain at one end of the link and it may not be raining at all at the other end. This natural factor improves overall link performance during actual rain conditions and allows extending the operating distances while keeping the same level of link availability.

On the graph below there are experiment-calculated dependences for rain rate intensity vs. attenuation for PPC-1000 gigabit point-to-point radios at FCC E-band. Rain intensity are 0 mm/hour, 5 mm/hour, 10 mm/hour and 25 mm/hour. ElvaLink has developed the experimental graphs of rain attenuation for all frequency bands among the available product matrix. To understand what a 5mm/hour rain is, see the list of meteorological data below to compare (for continental USA and Europe):

  • Drizzle 2mm/hour

  • Light rain 5mm/hour

  • Steady rain 12mm/hour

  • Summer cumulus rain 15mm/hour

  • Heavy rain 20mm/hour

These data allow network providers to optimize link ranges for geographical areas with wet climates and steady rains. The transceiver sensitivity limit for Gigabit Ethernet link lines is 70 dB (theoretical limit is 90 dB).

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