By Richard Downey, Philip Walsh, Sean Boland
Here is a extensive, built-in view of present communications applied sciences on hand world-wide - together with the net and net, electronic cellular telephony, ISDN, SMDS, body relay, and ATM - from a pragmatic company point of view. overlaying either inner most and public networks, the publication bargains a easy clarification of a variety of applied sciences and describes their underlying rules and contours, in addition to the standards that differentiate them. The advisor additionally showcases general purposes, exposes inherent obstacles, explains pricing and strategies of comparability, and discusses defense pitfalls and defense platforms.
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Additional resources for Communications Technology Guide for Business
Batteries may be used as standby in case of a mains failure. Lead-acid batteries are often used. These are extremely heavy, and special consideration of floor strength is required in the case of large installations. , hydrogen) and thus require adequate ventilation. •They contain acid, which can spill out if the battery is damaged or knocked over. •They are capable of delivering very large current, which can cause a minor explosion and possibly start a fire if metal tools fall across the battery terminals.
Tone-Based Systems A variety of signaling systems, most of them involving the use of audio tones and pulses, have been developed for public telephone networks and have been adapted for use in PBX networks. These signaling systems use the speech circuits of a particular call to transmit information about that call. These audio-signaling systems are quite limited. First, few different signals are available so it is difficult to add new features. Second, the majority of the signals can only be sent during the callestablishment phase and not during the speech phase, making it difficult to add features that can be used during an established call.
Many are optimized for certain types of information or specific applications. 4 gives a brief definition and description of the main public network types available today. Chapters 5 through 9 of this book give more details. 25 A low-speed data network with very good global coverage but unsuitable for voice Frame relay A medium-speed data network ideal for interconnecting LANs and for other data applications; voice communication is possible at a slightly degraded quality Internet A global data network offering a variety of speeds but few (if any) guarantees of quality of service Switched multimegabit data services (SMDS) A high-speed data network offering speeds up to 25 Mbps; global coverage and interconnections are patchy Asynchronous transfer mode (ATM) A very-high-speed data network (up to 140 Mbps in 1997).