The system of operative communication is intended for organization of the data transmitting network by wireless.

Radio modems (RM), which operates in a monofrequent duplex mode with time division of reception-transfer and use of pseudo-casual sequences by number of elements 127 are used as radio stations.

Following structure of systems is proposed:

· central station (CS);

· 16 subscriber’s stations (SS) i.e. radio modems (RM).

Before the operation, addressing of RM is carried out by the cartridge with SS addresses and operating codes. The device (cartridge) with SS addresses and operation codes are moved from CS.

Number of subscribers in subgroup is 16, and number of subgroup in one region is 6.

In that case RM-s operate on one logical direction.

It is intended for creation of multi channel radiotelephone communication:

a) for subscribers of out-of-the-way and remote regions, where there are not enough telephone lines;

b) between automatic exchanges (AE);

c) between subscribers of commutators (C).

It is used for creation of special types of communication and for development of operative channels at extreme circumstances.

Wireless extender provides high noise-immunity and reliability of transmitting information, by using of spread-spectrum systems of communication and digital processing of data with additional coding of information.

On the long distances it can be used as repeater with using of additional extender. Using method of the digital transmission and signals’ processing removes the limitation of retransmissions coefficient.

Wireless extender consists of station complete (SC) and subscriber complete (SbC). Main units of SC and SbC are radio modem (RM) and matching unit (MU).

Diagram of radiotelephone communication based on wireless extender