A Manager's Guide to Telecommunications by Martin Gandoff (Auth.) PDF

By Martin Gandoff (Auth.)

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Extra resources for A Manager's Guide to Telecommunications

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Multiplexers Multiplexing can apply to voice and/or data messages, but is probably easier to explain in terms of data only. ) and it was not economical to give each device its own individual link to the CPU. The fast devices would be connected by their own fast 'selector channel' (IBM terminology), while all the slow ones could share a 'multiplex channel'. By 'byte interleaving', the CPU could send or receive individual bytes to/from each device in turn using the technique of polling, in which on a regular, 'democratic' basis, each device is interrogated to see if it is ready to send/receive the next byte and a byte at a time the data is received/sent.

2 Serial and parallel transmission the character and assuming that eight data bits are needed for each character, the addition of two stop/start bits means that 2/10ths of the channel capacity is wasted as far as data transmission is concerned. g. sending a piece of keyed-in text from a word-processing clerk to a remote disk store, or using an on-line badgereader to send flexitime readings to a remote payroll computer. For synchronous transmission, timing marks are inserted around blocks of characters instead of 'framing' each character with stop/start bits.

Multiplexers Multiplexing can apply to voice and/or data messages, but is probably easier to explain in terms of data only. ) and it was not economical to give each device its own individual link to the CPU. The fast devices would be connected by their own fast 'selector channel' (IBM terminology), while all the slow ones could share a 'multiplex channel'. By 'byte interleaving', the CPU could send or receive individual bytes to/from each device in turn using the technique of polling, in which on a regular, 'democratic' basis, each device is interrogated to see if it is ready to send/receive the next byte and a byte at a time the data is received/sent.

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