GENERAL
      Low and average traffic (2...34 Mbps) digital radiorelay systems manufactured by "Saturn" Joint Stock Company was designed for organisation of the point-to-point communication at 8...40 GHz frequency range for providing the transmission of digital information flow. The application of radiorelay systems is preferable when the using of cable lines is difficult, when it is required the optimal decision for set up of the local, zone, mobile and stationary communication networks and also for computer network.
      Digital radiorelay systems manufactured by "Saturn" Joint Stock Company was designed for high quality communication with the low cost maintenance and for the is servicing needed the small staff.
      The conception of digital radiorelay systems manufactured by "Saturn" Joint Stock Company includes not only the hardware questions but also the following Services:
      the analysis of business proposals, the network planning, the project managing, the technical support, the repair and maintenance, the teaching courses for Customers and the transferring of up-to-date technologies.

FEATURES

       · availability of 8...38 GHz and 2...34 Mbps stations in one family;
       · quick put into operation, that means the quick return of the investment;
       · high quality of data transmission and effective interference rejection;
       · flexible and open interface that is the guaranty of the compliance with future networks and with the requirements of Customers;
       · compact modular design of outdoor blocks that provides the wind resistance stability, simplified and flexible mounting;
       · the outdoor blocks not depended on the capability and the indoor blocks not depended on the frequency;
       · there is the protection against unsanctioned access to the transmitted data;
       · existence of the embedded forked telecontrol and telesignalization system;

SYSTEM COMPONENTS
      Operating frequency range of radiorelay systems is provided by typical radioblocks execution:
      7,9…8,4 GHz - "Saturn-Е/8"
      10,7…11,7 GHz - "Saturn -Е/11"
      12,75…13,25 GHz - "Saturn -Е/13"
      14,4…15,35 GHz - "Saturn -Е/15"
      17,7…19,7 GHz - "Saturn -Е/18"
      21,2…23,6 GHz - "Saturn -Е/23"
      27,5…29,5 GHz - "Saturn -Е/28"
      36,0…39,5 GHz - "Saturn -Е/38"
      Digital radiorelay systems are the basis for required radiolines, depending on the radioline configuration those systems may be the terminal or repeated station. The pointed radiorelay stations consist of three main parts which are the following:
       - outdoor radiomodule which performs all functions of transceivers;
       - antenna with positioner; antenna may be integrated with radiomodule or may be installed separately;
       - access module which is placed in premises and it provided the connection of the radiomodule with terminal equipment. It is fully independent from the frequency band and may be delivered in different versions for various traffic capacities and system configuration.

SYSTEM CONFIGURATION
      Radiorelay system may be configured in different ways that gives the possibility to create:
      · starting from one radiorelay spacing without complete redundancy with the simplified control system and direct connecting of the radiomodule with digital flow forming equipment;
      · up to several decades of radiorelay spacings with the complex control system, with complete redundancy and with the extracting of flows at repeater and terminate stations.
      The radiorelay system may be configured with complete 1+1 redundancy and without complete 1+0 redundancy of base traffic. The 1+1 redundancy is obtained by using the frequency diversity or the additional equipment. Any terminal (or a node of radiorelay system) may be configured in such a way that to provide:

* regeneration of digital flows without extracting in radioblocks and its retransmitting;      * the retransmission of digital flow at 70 (140) MHz by direct connection of radioblocks with each other;      * the access and possibility of digital flows extracting by access module in equipment room;      * Each access module can be configured in such a way that to provide:      - the service of required quantity of radiolines;      - the work both with complete (1+1) redundancy and without complete (1+0) redundancy;      - different spacings at different frequency ranges with any capacity in every direction.

     The terminals are easy configured according to the Customer requirements. The required node configuration is achieved by combination of different access modules.
     The preventive maintenance in one of the directions is performed without disruption of communication in another directions.

     The flexibility of radiorelay system allows to create the following different kinds of networks:

1. Mobile networks. Saturn's radiorelays allow quickly and effectively connect the elements of cellular network i.e. the mobile switching center (MSC), the base station controllers (BSC), the base receiving/transmitting station (BTS). Besides that into network may be inserted the zone communication networks with the average capacity.

2. Fixed public communication networks. Saturn's radiorelays provide the quick increasing of users for public phone networks giving the attractive alternative in comparing with costly, labor-intensive and time consumption cable connections between telephone stations.

3. Private, corporate networks. On the base of radiorelays may be built the internal corporation networks for transferring the data and voice; may be connected the separate phone stations and computer networks which have different location.

4. Wireless closed networks. The Saturn's radiorelays are a good and effective alternative to the copper and optic-fiber cables in wireless closed networks. Saturn's radiorelays are used for connecting the base stations to the fixed network.

      Radioblock consists of the hermetic container in which are placed the microwave receiving/transmitting modules, the service access module (alarm and control system, service communication), internal secondary power supply. In some cases the radioblock may be furnished by the regenerator of digital flows or the modems. The container provides the protection against environmental and mechanical influences, the shielding against electromagnetic radiation. As a rule the radio block is integrated with an antenna but there is possibility to install it separately. The standard wavequide of related frequency band is the interface for antennas. The radioblock has connectors for coupling with coaxial cable, technological board and power supplying cable (if its required).

The access module provides the radiorelay interface with the common networks, the direct users, the customer phone stations, the mobile switching centre and the computer networks. The attending personnel using the access module has access to the technical channels for servicing and receiving the alarm and status information. The access module consists of:

· depending on traffic capacity and reserving conditions base block has a number of modifications and it also performs the function of digital modem at 70 MHz (or 140 MHz) intermediate frequency or the interface of digital flows in HDB3 (AMI) code. The base block has the connectors for connecting the cables from radioblock and the forming equipment of digital flows and it has the connectors for connecting the technological control board with handset or for connecting the power supply. On the front panel of base block there are light indicators, the switches of network condition and telecontrol signals. The base block can be not used under building up the simple radiolines without redundancy for 2.048 and 8.448 Mbps traffic in the case of installation the modem part in radioblock;

· multiplexer which integrates the number of 2.048 Mbps flows in one bigger flow (8.448 Mbps or 34.368 Mbps).
The multiplexer interface with 2.048 Mbps transmitting velocity is agreed with Rec. G.703

     According to the Customer requirement the access module may be completed by the forming equipment of digital flows (PCM-30 and PCM-120), and can also provide the integration with digital telephone station having the 2.048 Mbps standard interface (for example: Cheikom-300 and etc...).

- Traffic interface is according to G.703 of ITU-T, symmetric or asymmetric
- Characteristics control is according to G.826 of ITU-T
- Environmental conditions:
Ambient temperature of operation:
    - radioblock: from minus 40°С up to +50°С
    - access module: from minus 5°С up to + 50°С
Relative humidity:
    - radioblock: 8…100%
    - access module: 5…90%
Supply voltage:
    - direct current: +24V, +48V, -60V ±20%
    - alternate current: 220V, 50 Hz ±20%

MOUNTING, OPERATION AND MAINTENANCE
     The mounting and putting into operation is not required the special accessories or much time and can be done the team of Company's specialists or Customer's experienced team.
     The access modula of radiorelay station create in the network the service communication channel between the separate terminals; can transmit the control signals; can indicate the regime of terminals and its provide the management/control of radioblock by the process/supplement board without its disassembling.
     The attending personnel have full information about operating condition of whole network so as the separate blocks of radiorelay system. Besides that all terminals of network which are under servicing have the additional "service" board which has direct output on service center of "Saturn" company by the forming special telecontrol channel that gives possibility in advance to do the preventive control/maintenance of equipment by our specialists.

DISTINCTIVE FEATURES AND APPLICATION OPPORTUNITIES
     The main distinctive features of DRRS "Saturn-E" series are:
     the presence of 8...38 GHz and 2...34 Mbit/s;
     the quick launching of the system, quick return on investments;
     high quality of the data transfer and effective noise rejection;
     flexible and opened interfaces that insures future nets compatibility and meet the requirements of the customers;
     compact module construction of the outer blocks that provide wind-overloading stability. Simple erection;
     protectability from unauthorized access to the information;
     developed system of the TV-control and TV-alarm.

DESCRIPTION OF THE RADIOBLOCK
     Radioblock consists of the hermetic container in which are placed the microwave receiving/transmitting modules, the service access module (alarm and control system, service communication), internal secondary power supply.
     The containers are of two types:
     for the frequencies up to 15 GHz;
     for the frequencies over 15 GHz.
     the radioblock and modem are connected with the coaxial cable. Through these cables such signals are transmitted:
     input signal IF 70 MHz;
     voltage -60V;
     control signal of receiving/transmitting channel.
     You can check the efficiency of radioblock at IF using the "Shleif" mode. It gives the maximum information about receiver/transmitter efficiency.

MODEM DESCRIPTION
     DRS modems have the following variants:
     two at maintenance conditions: dead-end and central or intermediate;
     two at the reservation level: 1+0 and 1+1;
     fife at transfer speed: Е1; Е1хЕ1; Е2; Е2хЕ2; Е3;
     dead-end/ central modem provides the input digital flow conversion in HDB-3 format into phase-shift keyed signal Д-ОФМ4 (DEOQPSK) of the intermediate frequency and reverse conversion of the FM signal intermediate frequency ПРМ (70 MHz) into digital flow of the same format;
     modem provides the function of the TV-control system and business telecommunication of the DRS;
     modem provides the power supply of the radioblock;
     the modems are unified for all frequency types of DRS;
     you may create additional channels in the modem systems.
     modem always checks the errors on different routes.
     specific data transfer rate 1,67 (Bit/s)/Hz;
     the modem has two local tails at a digital line tract an intermediate frequency;
     input signals intermediate frequency range of the line tract 75-750 мкV (effects.);
     digital line tract signal interface G.703 -75 Оhm (not symmetrical.) and 120 Ом (symmetrical);
     tract interface IF - 75 Оhm (not symmetrical.);
     intermediate frequency of the demodulator and modulator is stipulated 70 MHz;
     the type of the subcarrier modulation GMSK-0.5 (0.3);
     modem structure;
     digital line tract with the schemes of synchronization and pulse stuffing;
     he line tract of the IF included in QPSK modulator and coherent QPSK demodulator with AGC (automatic gain control) scheme;
     errors control system (for 1+1);
     the scheme of the forming and channel drop in the group digital flow.

     MONITORING SYSTEM
     The system is oriented on the monitoring, operation control of the radiorelay nets. It allows receiving, controlling and processing information about every fragment of the radiorelay net on the fly. And also to carry out the operation of some station parameters manually using operator's display.
     The system consists of:
     net server (may be connected at every fragment of the net);
     client terminals (at every radiorelay station);
     service terminals, (intended for manual control parameter setup).
     The system provides:
     functioning and operating control of the equipment in the automatic and manual modes of operation;
     TV-service and control of the net from the certain terminal;
     record-keeping of the operating modes and emergency situations in the net in the real time;
     remote control of the operators access to the system at the dedicated channels.
     System controls:
     efficiency of the DRS components;
     operating frequencies of the DRS radioblocks;
     flows capacity;
     group flow errors coefficient;
     capacity levels of the transmitters;
     input receivers capacity levels;
     automatic gain control receivers levels;
     Synchronism and protection channels condition.
     The system provides operation:
     of the receiving and transmitting frequencies of DRS radioblocks;
     of the beginning capacity level of the transmitters;
     of the transmitters capacity switching-off;
     of the operation mode of the transmitters install;
     of the tails switch-on;
     network capacity;
     traffic route;
     chooses the mode of reservation of the working channels.
     As the main connection channels the system uses 64 kbit/s channels. They are organized in the group flow for data and voice information transfer. As the reserve channels you may use the optional telephone nets in the Dial-Up mode of operation. For service terminals connection each DRS has a junction RS-232, or RS-485. DRS net may have linear, circle layout and also combined layout with the junctions' creation. The net organizes on the basis of packet transmission keep record called Frame Relay. It installs the switchboards in the network nodes. TV-control, TV-alarm and service communication system is working with DRS frequency range 7…40GHz and capacity from 2 to 34Mbit/s. The system fits with the F.753 ITU-R и 6.821, 826, 921 ITU-T recommendations.
     The system provides:
     functioning and operating control of the DRS in the automatic and manual modes;
     TV-service and net control from the random terminal;
     keeping record modes of operation and emergency situations of the DRS and net in the real time scale;
     remote access of the operator to the system at the certain dedicated communication channels.
     the system reflexes the results of the control at the indication elements.
     The system provides control of:
     efficiency of the DRS details (radioblock e.t.c.) displays control and alarm systems;
     operating frequencies of the radioblocks;
     flows capacity;
     group flow errors coefficient;
     capacity levels transmitter;
     input capacity levels receiver;
     automatic gain control levels receiver;
     supply voltage;
     consumption currents of the main DRS parts;
     synchronism;
     The system controls:
     receiving and transmitting frequencies of the radioblock;
     beginning level of the transmitter capacity;
     transmitter capacity switch off;
     install the transmitter mode of operation;
     switching on the tails;
     carrying capacity;
     routing of the traffic;
     selection of the reserving and working channels modes;
     massages transmission at the channels;
     manual blocking bodies.
     Ervice communication channel provides:
     voice communication;
     formalized communication;
     fax communication;
     On subcarrier frequencies:
     voice communication;
     data exchange.
     Service channels capacity:
     from 64 Kbit/s to 2.048 Mbit/s it depends on the capacity of the main flow: (G.703)
     1x9,6 Кbit/s to 4x9,6 Kbit/s (RS-232, RS-485);
     one channel 0,3 …3,4 kHz of the analog telephone.