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Link refers to the physical path and channel refers to the portion of a link that carries a transmission between a given pair of lines. One link can have many (n) channels.

The permanent link includes only that portion of the cabling installation that is "permanent" (think punched down). It includes jack to rack -or- wall outlet to patch panel. One connector is allowed at each end but any patch cables must be accounted for and removed from the test results. This generally means you must use the cables that came with your test equipment so the equipment knows exactly what to subtract.

The channel link includes two or more patch cables and may include multiple patch panels - possibly in multiple closets.

By: ISRAFIL CSE

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11y ago
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Link refers to the physical path and channel refers to the portion of a link that carries a transmission between a given pair of lines. One link can have many (n) channels.

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In multiplexed system n-lines (channels) share bandwidth of one link

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Q: What Distinguish between a link and a channel in multiplexing?
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Describe the goals of multiplexing and two main multiplexing techniques?

In telecommunications and computer networks, multiplexing (known as muxing) is a term used to refer to a process where multiple analog message signals or digital data streams are combined into one signal over a shared medium. The aim is to share an expensive resource. For example, in telecommunications, several phone calls may be transferred using one wire. It originated in telegraphy, and is now widely applied in communications. The multiplexed signal is transmitted over a communication channel, which may be a physical transmission medium. The multiplexing divides the capacity of the low-level communication channel into several higher-level logical channels, one for each message signal or data stream to be transferred. A reverse process, known as demultiplexing, can extract the original channels on the receiver side. A device that performs the multiplexing is called a multiplexer (MUX), and a device that performs the reverse process is called a demultiplexer (DEMUX). Inverse multiplexing (IMUX) has the opposite aim as multiplexing, namely to break one data stream into several streams, transfer them simultaneously over several communication channels, and recreate the original data stream.Techniques of MultiplexingA multiplexing technique may be further extended into a multiple access method or channel access method, for example TDM into Time-division multiple access (TDMA) and statistical multiplexing into carrier sense multiple access (CSMA). A multiple access method makes it possible for several transmitters connected to the same physical medium to share its capacity.Multiplexing is provided by the Physical Layer of the OSI model, while multiple access also involves a media access control protocol, which is part of the Data Link Layer.


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