Term
| basic communications model |
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Definition
| encoder>transmitter>channel>receiver>decoder |
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Term
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Definition
| transfer of data over distances via electrical, electromagnetic, or photonic means |
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Definition
| machine-to-machine communication |
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Definition
| virtual connection between sender and receiver |
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Definition
| physical connection between two nodes |
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Definition
| consists of a pattern of circuits enabling communication among more than two nodes |
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Definition
| route taken by a specific signal |
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Definition
| one path to get to a specific node |
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Definition
| multiple pathes can be taken to get to a specific node |
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Term
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Definition
Data terminating equipment (DTE) = computer/terminal
Data communications equipment (DCE)= modem |
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Definition
| simplex, half duplex, full duplex |
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Definition
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| bi-directional capability through circuit reversal (walkie-talkie, CB radio) |
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Definition
| simultaneos bi-directional communication; foward or reverse channels (telephone) |
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Term
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Definition
| bits of a character follow each other down a single wire/cable |
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Definition
| bits are sent simultaneously over seperate wires |
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Definition
| information carrying capacity of a circuit, channel or medium |
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Term
| digital bandwidth is measured in |
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Definition
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Term
| bandwidth can be reduced if ____ |
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Definition
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Term
| bandwidth can be increased by ___ |
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Definition
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Term
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Definition
| long lines, long connections |
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Term
| an analog environment is susceptible to three things... |
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Definition
attenuation signal
noise on the medium
amplification of the signal + noise |
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Term
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Definition
reducing the amount of data by not sending redundant data
-reduces the amount of storage
-less bandwidth required for transmission |
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Term
| redundancy, once recognized, can be recognized in two ways... |
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Definition
-using a dictionary: compression rate up to 2-1
-recreating the file: 250-1 |
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Term
| NOISE: two types of signals |
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Definition
accoustic signals: noise appears as competing accoustic signals
electrical signals: noise appears as static or electromagnetic pulses |
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Term
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Definition
| relationship between signal and noise |
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