The optical fiber is widely applied in communication networks with high information capacity and necessity of qualitative transfer of the information on greater distances.

The optical fiber due to the broadband enables transfers of the big stream of the information (some thousand channels), and thus the optical cable has small overall dimensions and weight (in 10 times less, than at copper cables).

The optical fiber due to small losses will organize greater lengths of transmitting sites (30, 70, 100 km), has high security from external influences, transitive handicapes and the reliable safety precautions (absence and short circuit).

The optical system of transfer of the information considerably surpasses system of transfer of the information by means of electric signals. The wide passband and small attenuation of a signal in optical systems allow to transfer greater volume of the information with smaller losses and mistakes, and provide to fiber-optical cables significant technical advantages in comparison with the cables using copper conductors.

Small attenuation of a signal plays especially important role for long-distance networks as allows to increase length of a reclaiming site up to 100 km, and presence of a wide passband allows to build networks according to modern requirements to speed of data transmission which constantly increase for networks of all levels.

At use onemode a fiber cable it is possible to provide transfer with a speed in some Gbit/sec on distance more than 100 km without regeneration.

DWDM is a modern technology of transfer and condensation in one optical fiber of several optical signals with various lengths of waves. The DWDM-equipment allows to transfer on one pair optical fibres on tens and even hundreds lengths of waves the traffic of various reports (SDH/ATM/IP) with different speeds.

Practical use of equipment DWDM constantly extends in connection with fast development of communication networks of all levels. The traffic of data and in networks of mobile communication today increases. It demands substantial growth of capacity of transport networks of the main level.

First of all, DWDM it is applied not to creation of new fiber-optical networks, and for modernization and expansion of existing networks with a view of essential increase of their throughput and availability.

One of the basic advantages of technology DWDM - a fast recoupment enclosed by operators in its introduction of means and reception of profit. Moreover, operators do not have necessity to lay new lines, that also is connected with additional charges and problems.

Key advantage DWDM that the report and speed for each channel - are independent. On DWDM data IP, ATM, SONET/SDH and Ethernet with speeds between 100 Mbit/sec can transfer technology a network. And 2.5 Gbit/sec. Except for that DWDM networks can bear various types of the traffic with various speeds on one optical channel.

Equipment SDH - a basis of modern high-speed telecommunication networks. For today creation of effective and reliable transport networks SDN is possible on the basis of systems of flexible multiplexing SMA.

Synchronous multiplexers SMA, possess high flexibility and universality. Profitability and compactness of these network elements ideally approaches for application on communication networks. Moreover, our equipment SDH is a universal decision on granting economic network Ethernet, and also services of speech transfer and data.

Equipment SDH, on the basis of systems of transfer of synchronous multiplexing SMA, allows to solve problems of escalating of speed of transfer of the information and to create the flexible interconnected communication systems operated from the uniform center with an opportunity of fast escalating and modernization.

The system of synchronous multiplexing transfer (SMA) is intended for the organization main, zones and city communication lines on onemode to a fiber-optical cable in a range of lengths of waves 1,31 or 1,55 microns.

Networks SDN sold by means of the synchronous multiplexing equipment, create failure-safe transport networks with an opportunity of restoration of working capacity in the shortest terms. Moreover, SMA allows to transfer a qualitative signal to greater distances, and also the big number of the streams connecting automatic telephone exchange in the cheapest way.

The platform of a network of access realized on technology HFC (Hybrid Fiber Coax) is a modern telecommunication network giving to subscribers packages tele-and radio programs and also wide assortment of interactive multimedia services. Application of technology HFC (a hybrid network) guarantees:

• A wide spectrum of services offered in a network, consisting of translation of programs RTV and modern telecommunication services (for example: data transmission, a telephony in networks, video under the order)
• The big radius of access of the network, allowing to integrate the remote cable networks
• High quality and reliability of translation
• An opportunity of expansion of an accessible range of transfer by means of segmentation of a network
• The greater throughputs of a network accessible owing to application of technology of multiplexing (DWDM)
• Simple and inexpensive migration in a direction of a network of access of type FTTC (Fiber To The Curb), FTTB (Fiber To The Building), FTTH (Fiber To The Home)

Networks of new generation (HFC) possess a number of advantages above already existing and in due course will supersede them.