DATA TRANSMISSION NETWORK

System of data transmission

The system of data transmission (SDT) consists of the several components defined depending on solved problems. It is far not the full list of them – switchboards, routers, gateway screens and bridges, multiplexers, various converters of the physical environment and interfaces of data transmission, point of wireless access, the client equipment, the software managements of the equipment - shows complexity, variety of architecture of system as a whole. Also practically all modern engineering systems incorporate the built in components for the organization of transfer of diverse data (the service "horizontal" traffic between devices, given managements between control centre and devices, multimedia traffic), directly related to SDT. Base for the majority of the integrated systems – complex system of safety represents, as a matter of fact, the heterogeneous network, forming data about object. From the point of view of its data transmission it is necessary to consider in following aspects:

1. Topology.

If the company exists on quite certain platform (territorially indivisible unit), then SDT solves information transfer problems, as a rule, only between internal users; network in the pure state is "local". Other networks (for example, Internet) for SDT company are defined as external. If the company has territorially carried platforms but which should work as one logic unit, then SDT can be named as "distributed". In this case, requirements to safety, optimum distribution of information resources (for example, databases), data links rise.

2. Structure of transferring traffic.

Complexity (accordingly, cost) of the applied equipment directly depends on planned to transfer through network. The simplest case – is data transmission, not critical for temporary delays (for example, transfer of files). It is much more difficult to design a network, where various categories of data - from already mentioned up to multimedia simultaneously should be transferred, where quality of final-product (a telephony, videoconferences) for the user directly depend on structure, functionality of SDT.

3. Scale.

Quantitative characteristic of a network. The more there is SDT users (workplaces, other systems using SDT), the more requirements to the correct organization of a network structure, to equipment functionality (for example, throughput).

4. Technologies.

As a rule, the majority of networks are under construction on a copper cable. Depending on structure of a network, (including distances between units, between unit and a workplace, etc.), safety requirements, speed of data transmission, climatic conditions and, certainly, admissible financial expenses for construction and maintenance of SDT, the physical network can combine copper cables also (categories 3, 5e, 6, 7), and optical multi/single-mode (MM/SM)).
Thus the steady tendency of repeated increase in the internal traffic first of all due to necessity of the analysis of video-images was designated at solution-making in complex system of safety. Whence it follows, immediate prospects are as a close integration of complex system of safety and system of telecommunication.

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