Data Communications Networking Devices: Operation, by Gilbert Held

By Gilbert Held

Extended and up-to-date to supply readers with an in depth figuring out of the houses, operations and purposes of units utilized in developing an information communications community. New positive aspects comprise broad insurance of LANS; the newest details on modems; in-depth exam of multiplexes together with the Hayes command; contemporary info at the operation and usage of bridges and routers plus even more.

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By Gilbert Held

Extended and up-to-date to supply readers with an in depth figuring out of the houses, operations and purposes of units utilized in developing an information communications community. New positive aspects comprise broad insurance of LANS; the newest details on modems; in-depth exam of multiplexes together with the Hayes command; contemporary info at the operation and usage of bridges and routers plus even more.

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Data Communications Networking Devices: Operation, Utilization and LAN and WAN Internetworking

Increased and up-to-date to supply readers with a close figuring out of the houses, operations and functions of units utilized in developing a knowledge communications community. New positive aspects contain vast insurance of LANS; the most recent info on modems; in-depth exam of multiplexes together with the Hayes command; contemporary facts at the operation and usage of bridges and routers plus even more.

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8 Terminal-to-computer connections via analog mediums. 3 TYPES OF SERVICES AND TRANSMISSION DEVICES ______________________________ 13 The use of an FX line permits the elimination of long-distance charges that would be incurred by users directly dialing a distant computer facility. Since only one person at a time may use the FX line, normally only groups of users whose usage can be scheduled are suitable for FX utilization. 8 illustrates the possible connections between remotely located terminal devices and a central computer where transmission occurs over an analog facility.

Although modem equipment marketed during 1998 only enabled 56 kbps transmission in one direction via the switched network, it is quite possible that by the time you read this book a bidirectional 56 kbps transmission capability will be available for dedicated and leased analog lines. 6 TYPES OF TRANSMISSION The two types of data transmission one can consider are serial and parallel. For serial transmission the bits which comprise a character are transmitted in sequence over one line, whereas in parallel transmission characters are transmitted serially but the bits that represent the character are transmitted in parallel.

3, the column headed ITU refers to the International Telecommunications Union, a United Nations agency headquartered in Geneva, Switzerland. Previously, the standardization body of the ITU was known as the Consultative Committee on International Telephone and Telegraph (CCITT) and, even though the renaming occurred several years ago, many people still use the term CCITT when referencing certain standards. 4 TRANSMISSION MODE __________________________________________________________ 25 Until the 1980s most ITU standards were primarily followed in Europe.

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