By Richard Downey, Philip Walsh, Sean Boland
Here is a extensive, built-in view of present communications applied sciences to be had world-wide - together with the web and internet, electronic cellular telephony, ISDN, SMDS, body relay, and ATM - from a realistic enterprise viewpoint. masking either deepest and public networks, the publication 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 average functions, exposes inherent boundaries, explains pricing and strategies of comparability, and discusses safety pitfalls and safeguard structures.
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Here is a vast, built-in view of present communications applied sciences to be had world-wide - together with the web and net, electronic cellular telephony, ISDN, SMDS, body relay, and ATM - from a pragmatic enterprise point of view. masking either inner most and public networks, the ebook bargains a uncomplicated clarification of quite a lot of applied sciences and describes their underlying ideas and lines, in addition to the criteria that differentiate them.
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Extra resources for Communications Technology Guide for Business
7 Computer Telephony Integration Many modern PBXs can be connected to general-purpose computers using a link cable known as a CTI link. This allows the PBX processor to communicate with a third-party computer system to provide a new set of integrated applications. Examples include: •Databases that react to the calling line identification of an incoming call and “pop up” information relating to the caller (so-called screen-pops); •Databases that react to the DID digits coming from the PSTN; •Call management systems—make or transfer calls by selecting a person’s name on a computerized phone book; •Voice-mail management systems—view a list of voice messages including their origin and duration on the PC screen and select which one to listen to first.
A small route is dimensioned for a very poor grade of service (1:10) but a good circuit utilization. The failed attempts are given the chance to try an alternative route before the caller is given busy tone. Provided the second route is generously dimensioned, the callers do not suffer from the low GOS of the first route. 47 Source: . © 1994 Roger L. Freeman. Reprinted by permission of John Wiley & Sons, Inc. 4 Processor Capacity Processor capacity is determined by the number of call attempts as opposed to the traffic.
This means that the first person who opens a file is allowed to make changes and save them. Anyone else who tries to open the same file will receive a message saying that the file is in use but that they may open it in read-only mode. If this second user opens the file in this mode he or she will be prevented from making changes unless he or she makes a copy of the file with a different name or in a different storage area. In a database system, a more sophisticated form of locking, called record locking, is possible.