Read e-book online Data Communications Networking Devices: Operation, PDF

By Gilbert Held

ISBN-10: 047197515X

ISBN-13: 9780471975151

Elevated and up-to-date to supply readers with an in depth figuring out of the houses, operations and functions of units utilized in developing an information communications community. New beneficial properties comprise vast insurance of LANS; the most recent info 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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Using a digital service, data is transmitted from source to destination in digital form without the necessity of converting the signal into an analog form for transmission over analog facilities as is the case when modems or acoustic couplers are interfaced to analog facilities. To understand the ability of digital transmission facilities to transport data requires an understanding of digital signaling techniques. Those techniques provide a mechanism to transport data end-to-end in modi®ed digital form on LANs as well as on wide area networks that can connect locations hundreds or thousands of miles apart.

Asynchronous transmission normally is used for transmission at speeds at or under 33 600 bps over the switched telephone network or on leased lines, while data rates up to 115 200 bps are possible over a direct connect cable whose distance is normally limited to approximately 50 feet. The term asynchronous TTY, or TTY compatible, refers to the asynchronous start±stop protocol employed originally by Teletype1 terminals and is the protocol where data are transmitted on a line-by-line basis between a terminal device and a mainframe computer.

4 Signal conversion performed by modems. A modem converts (modulates) the digital signal produced by a terminal into an analog tone for transmission over an analog facility transmission lines when an analog transmission service is used. Analog transmission facilities include both leased lines and switched lines; therefore, modems can be used for transmission of data over both types of analog line connections. Although an analog transmission medium used to provide a transmission path between modems can be a direct connect, a leased, or a switched line, modems are connected (hard-wired) to direct connect and leased lines, whereas they are interfaced to a switched facility; thus, a terminal user can communicate only with one distant location on a leased line, but with many devices when there is access to a switched line.

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


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