By Richard Downey, Philip Walsh, Sean Boland
Here is a vast, built-in view of present communications applied sciences on hand world-wide - together with the web and internet, electronic cellular telephony, ISDN, SMDS, body relay, and ATM - from a pragmatic company point of view. masking either inner most and public networks, the e-book deals a easy clarification of quite a lot of applied sciences and describes their underlying ideas and lines, in addition to the standards that differentiate them. The advisor additionally showcases ordinary purposes, exposes inherent obstacles, explains pricing and techniques of comparability, and discusses safety pitfalls and security structures.
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Encyclopedia of Communication and Information
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Extra resources for Communications Technology Guide for Business
Sample text
It is possible to determine the maximum delay that data will encounter). This advantage, however, does not add up to very much in an office situation. It is not possible to mix token ring and Ethernet on the one cable because they use different protocols and speeds. 5 LAN. Apart from the expense, the 3-to-5 bridge must convert from one protocol to another, and for this reason it is noticeably slower than bridges that link LANs of the same type. In most cases, organizations prefer to choose one technology and stick with it.
Speech quality on long-distance connections is maintained if all of the intermediate links are digital. 5 or 2 Mbps) between them. •Digital PBXs often support ISDN connections to a public network, thus giving the possibility of advanced services to each station. ISDN is dealt with in greater detail in Chapter 6. •Most digital PBXs can support data communication at 64 Kbps. 2 Telephones (Stations) The telephones used on a PBX are often referred to as stations. , both proprietary phones and standard telephones).
Links to other third-party equipment are also called trunks. Examples include music trunks for music-onhold, paging trunks, and recorded announcement trunks. ) can be incoming-only, outgoing-only, or both incoming and outgoing. They are very similar to the ordinary telephone lines that any household would have, but they normally have additional features appropriate to a PBX. Trunks can be either analog or digital. Digital trunks can be ISDN or non-ISDN. Non-ISDN digital trunks are referred to as switched digital lines; they were introduced as a stop-gap arrangement prior to ISDN, and they are often more expensive than ISDN lines.
