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By Martin Gandoff (Auth.)

ISBN-10: 0434910686

ISBN-13: 9780434910687

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E. they are the same lines as used for voice from telephone to exchange in the PSTN. The main advantage is in the convenience of not having to dial out. These lines are limited to about 2400 baud. For use with dial-up services, modems are usually asynchronous. With the higher-grade lines, synchronous modems are rather more efficient and generally have the ability to attach timing marks to the data. Asynchronous transmission is handled by software. Higher-grade 'special voice grade' lines can be leased which are of use up to 9600 baud and 'wideband' lines are available for higher-speed transmission.

24. 25. To detect this kind of error, we attach an extra bit (redundant in that it is not actually needed to identify the character) that is set as a function of the number of ones in the original character. Taking the EBCDIC T>' (11000100) and even parity, the extra bit is set to a 1, so that the total number of bits is an even number (110001001). 25 4 0 3 0 2 1 0 1 0 0 The character Έ' distorted to give 'D' electronics in the receiving terminal will detect a parity failure and request a retransmission.

With error level is very much more critical than with microwave and its extremely short wavelength, speech, radio broadcasting is both inefficient and dishes can be of the order of metres in diameter. With lower frequencies, the dish would have to be expensive. enormous. In addition, as we have seen, to carry enormous numbers of channels, we need very wide For high-power work, the waveguide itself can frequency bands and even when dealing with the theoretically be extended to form the antenna on VHF (very high frequency) FM radio band the rooftop.

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


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