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   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 (11) of central trunk line (41).

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, Hz

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, bit/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, R =1-6, 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, °

+5...+40

Humidity, %

70

Operating conditions of peripheral module

Temperature, °

-40...+60

Humidity, %

100

 

 

New products

Time-schedule of workshops

Copyright

Copyright © 2012
Nizhny Novgorod Factory named after M.V. Frunze.
All rights reserved.
 
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