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Medium-speed digital radio-relay stations of Contact series


The description of medium-speed digital radio relay station Contact on the example of DRRS "Contact-11.2M16ETH" (medium-speed DRRS are produced for frequency range 7...20 GHz) is given below.

"Contact-11.2M16ETH" works in the frequency range 10,7...11,7 GHz and is intended for organizing of one radio group of single- and moltispan lines with the bandwidth up to 34Mbps for telephony, Internet and other applications.

Contact-11M-2M16ETH.jpg

DRRS has flexible configuration and permits to transmit:
* Up to 16 E1 streams (in 2048Kbps each)
* Ethernet channel from 1,5 to 32Mbps depending on the number of unused E1 streams (resources of any unused E1 stream -   2048Kbps - automatically transfer to Ethernet channel);
* Telemetry and telesignaling channel;
* Additional channel of data transfer RS-232;
* Voice communication channel;
* Signaling sensor channel and executive device.

Additionally DRRS has:
* Two identical channels with unbreakage automatic change-over which is equally to reception reservation system;
* Two identical microwave frequency transfer channels permitted to use redundancy 1+1;
* It is permitted to use modems with two microwave frequency converters blocks (extended configuration) for receiving of diversed   reception(at large signal fading in air);
* With the help of service program it allows remote monitoring and control of all stations multispan radiorelay system through telemetry   and remote signaling.
* RRL powering ~ 140...260V (AC voltage) with the ability to connect back-up voltage 24...60V (DC voltage).

Technical features
Operating frequency range 10.7...11.7 GHz
Emission power 50...100 mW
Frequency band at negative level 30dB 31 MHz
Operating distance 35 km
Modulation kind QPSK
Antinoise coding Viterbi 7/8 + Reed-Solomon code 204/188>
Threshold sensitivity of DRRS receivers -108 dB/W
Level of transmitters undesirable emission, no more than Out-of-bands -40 dB
Sides -30 dB
Dynamic range of reception path, not less than 40 dB
Receiver selectivity of DRRS, not less than At adjacent channel 30 dB
At image channel 40 dB
Relative frequency deviation transmitters from rating value ± 2 ppm
Maximal length of coaxial cable reduction between modem and antenna 100 m
1 interface G.703, code HDB3, 120 Ohm
Maximal length of communication line at E1 stream with STP cable of 5 category 1 km
Ethernet interface IEEE 802.3 (10/100 Base-T)
Effective load of radio group 16xE1+ Ethernet (1 Mbps) or
Ethernet (33 Mbps) or
N*E1 and Ethernet (1+32-2*N Mbps), where N=0...16
Additional channel of data transfer RS-232 1,2...115,2 kbit/sec (selected by program)
Voice communication channel 64 kbit/sec (duplex)
Connection of external signal sensors and executive devices 1 input / 1 output in each station
Local control RS-232 5600-8-N-1
Antenna's characteristics Operating mirror diameter 0.95 m
Amplification, not less than 35 dB
Main lobe width, no more than 3
Supply voltage By alternating current 140...260V / 50Hz
By direct current 24...60 V
Power consumption (two half-sets), no more 200 W
Mode of operation Continuous
Range of operating temperature / humidity / air pressure Converters unit - 40 ... + 50 / up to 100% at 25 / 70-106,7 kPa (537-800 mm Hg)
Modem, power unit +5 ... + 50 / 90% at 25 / 70-106,7kPa (537-800 mm Hg)
DRRS readiness time for working, no more than 60 s
Dimensions Converters unit BC-120 760230160 mm
Modem 19"(2U) 483x325x88 mm
Power unit PS-154/7-27 19" (1U) 483x263x44 mm
Weight Converters unit BC-120 4.8 kg
Modem 5.1 kg
Power unit PS-154/7-27 4 kg
Antenna-rotary device 11 kg