CDMA technology
Radio-relay station (RRS) PURPOSE Radio-relay line (RRL) of DS-CDMA standard is intended for wireless voice and data transmission within 1600 km (32 intervals) and for providing telephone services, Internet access, holding of videoconferences. POTENTIALITIES - Construction of multihop (up to 32 intervals) radio-relay communication lines.
- Communication line construction in areas with unfavourable geography for signal porpagation (mountainous terrain, watery waste etc.).
- Transmission of confidential information without use of additional cryptography algorithms.
- Digital stream branching (1Å1) of central trunk line (4Å1).
FEATURES AND ADVANTAGES
Scrambling and noiseless coding. - Ensures high noise immunity of the line against disturbances from both other transceiving devices and landscape and/or city buildings.
- Ensures high level of confidentiality of transferred data without use of additional cryptography algorithms.
Intellectual algorithm of adaptive power change. - The central station automatically changes (depending on required quality of data transmission) output signal power ensuring in this way saving of electric energy and improving electromagnetic compatibility indexes.
RAKE receiver. - Ensures serviceability of the system under conditions of multipath signal propagation.
- Increases stability of RRL operation and continuity of data (voice) transmission along the whole extent of communication line.
Remote monitoring and control system. - Gives the possibility to control any transceiver in the system and remotely analyze the quality of transferred data by means of connection of a PC to any radio-relay station in the line.
SoftwareRadio function. - Gives the possibility to programmatically configure the functional parameter set of the RRL as applicable (without any change in the equipment configuration).
Developed in Russia. - The developer adapts the equipment according to the requirements of customer and provides after-sales services.
TECHNICAL DATA General technical data | Frequency range, GHz | 3.4-3.6; 5.1 -5.9 | Technology | DS-CDMA | Modulation | spread-spectrum modulation | Spectrum width, ÌHz | 5 /20 | Duplex | FDD frequency duplex | Maximum output power, dBm | 27 | Maximum communication range, km | 50/40 | Processing gain, dB | not less than 21/12 | Data stream, Ìbit/sec | 2.048/8.192 | Digital interface | E1(G703) 120Ohm balanced; E1(G703) 75ohm coaxial or Ethernet 10 Base-T | Maximum input signal level, dBm | minus 24 | Receiver sensitivity, ÂÅ R =1å-6, dBm | minus 96/ minus 87 | Transmission delay, msec | 3/7 | Control and monitoring | through radio channel | Yes | through service channel | Yes | through local loop | Yes | Configuring | With the help of software | Yes | Manual | Yes | Indication on the front panel | Channel status | Yes | “Reception/ transmission” state | Yes | Operating conditions of internal module | Temperature, °Ñ | +5...+40 | Humidity, % | 70 | Operating conditions of peripheral module | Temperature, °Ñ | -40...+60 | Humidity, % | 100 |
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