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Abstract

network channel scheme

Appazova S.S. Course on a subject «Systems, channels and communication networks». Project manager is Aslanov M.T. After collecting and processing the literature on a given topic in the course work, you need to identify the underlying problem, think about how it can be solved. To answer the question that needs to be done to resolve it, you actually get the goal of the course work, it will be based on the theoretical and practical part and formed a project plan.the first part of course work describes systems, channels and communication networks, block diagram, general immunity of radio, the passage of noise through the path of the receiving device. And also made the choice and justification of the structural scheme and the circuit diagram. The second part consists of part of the settlement, where calculated the necessary data transmission speed and the duration of single elements, bandwidth filters transmission and reception, the effective value of interference in the channel, time of entry into synchronism and synchronization reference time fluctuations.project is implemented in the program Word 2010 environment . This course work consists pages, figures and basic material from books. Introduction

1. Signals, channels and communication networks

telecommunications and computer networking, a communication channel or channel, refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel. A channel is used to convey an information signal, for example a digital bit stream, from one or several senders (or transmitters) to one or several receivers. A channel has a certain capacity for transmitting information, often measured by its bandwidth in Hz or its data rate in bits per second.data from one location to another requires some form of pathway or medium. These pathways, called communication channels, use two types of media: cable (twisted-pair wire, cable, and fiber-optic cable) and broadcast (microwave, satellite, radio, and infrared). Cable or wire line media use physical wires of cables to transmit data and information. Twisted-pair wire and coaxial cables are made of copper, and fiber-optic cable is made of glass.information theory, a channel refers to a theoretical channel model with certain error characteristics. In this more general view, a storage device is also a kind of channel, which can be sent to (written) and received from (read).channel can take many forms. Examples of communications channels include:

1. A connection between initiating and terminating nodes of a circuit.

2. A single path provided by a transmission medium via either

· physical separation, such as by multipair cable or

· electrical separation, such as by frequency-division or time-division multiplexing.

3. A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.

· A storage which can communicate a message over time as well as space

· The portion of a storage medium, such as a track or band, that is accessible to a given reading or writing station or head.

· A buffer from which messages can be 'put' and 'got'. See Actor model and process calculi for discussion on the use of channels.

. In a communications system, the physical or logical link that connects a data source to a data sink.

5. A specific radio frequency, pair or band of frequencies, usually named with a letter, number, or codeword, and often allocated by international agreement.Examples:

· Marine VHF radio uses some 88 channels in the VHF band for two-way FM voice communication. Channel 16, for example, is 156.800 MHz. In the US, seven additional channels, WX1 - WX7, are allocated for weather broadcasts.

· Television channels such as North American TV Channel 2 = 55.25 MHz, Channel 13 = 211.25 MHz. Each channel is 6 MHz wide. Besides these "physical channels", television also has "virtual channels".

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· Wi-Fi consists of unlicensed channels 1-13 from 2412 MHz to 2484 MHz in 5 MHz

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