By Richard Downey, Philip Walsh, Sean Boland
Here is a wide, built-in view of present communications applied sciences to be had world-wide - together with the net and internet, electronic cellular telephony, ISDN, SMDS, body relay, and ATM - from a realistic enterprise point of view. masking either deepest and public networks, the publication deals a uncomplicated clarification of a variety of applied sciences and describes their underlying rules and contours, in addition to the criteria that differentiate them. The consultant additionally showcases commonplace functions, exposes inherent boundaries, explains pricing and techniques of comparability, and discusses defense pitfalls and safety structures.
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Additional info for Communications Technology Guide for Business
Sample text
Wireless PBX coverage is based on micro cells. Base stations consisting of a small wall-mounted antenna with a limited coverage area, of, say, 50m radius, are strategically placed around the premises. The coverage area of each base station is called a cell. Most systems allow calls to continue uninterrupted as you move from one cell to another. The radio frequencies used do not generally require a special license, provided the equipment meets the required standards. 3 Voice Messaging Voice messaging systems allow a PBX to automatically play prerecorded messages in response to the actions of the caller.
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. This adds to the dangers posed by the release of hydrogen gas. The danger from gas and acid can be greatly reduced if recombination (sealed) batteries are used. Sealed batteries have no holes for acid to spill out, and during normal operation the gasses are kept within the battery where they recombine maintaining the acidic level.
This can be done at night or at any time when the attendant is not on duty. •Power fail transfer: When the power fails, a standby battery normally takes over. If the failure is prolonged and the battery expires (or if there is no battery), the system will connect the PSTN trunks to specific extensions. These extensions must not be feature phones, which cannot interwork directly with the PSTN. 3). 8). 8: Alternative routing. •Least-cost routing (LCR):This allows the PBX administrator to program the PBX to automatically choose the most economic route available, based on the number dialed and the time of day.