Home Latin America I 2000 Telecommunications Technology Trends

Telecommunications Technology Trends

by david.nunes
Rita FilgueirasIssue:Latin America I 2000
Article no.:12
Topic:Telecommunications Technology Trends
Author:Rita Filgueiras
Title:Product Manager
Organisation:Philips Business Communications
PDF size:16KB

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Article abstract

The development of new telecommuni-cations technology and services is taking place at an astounding pace, facilitating our lives at home and at work.

Full Article

Cordless telephony includes the wireless phone that has been a common fixture in homes for years, the cellular phone whose explosive growth threatens fixed phone dominance in many regions of the world, satellite based phones that can be used from anyplace in the world and the new DECT phones for business. The use of wireless phones has simplified the lives of people throughout the world. For business use, perhaps more than for personal use, wireless telephony is an essential tool. Instant co-ordination and instant contact with customers, from any place at any time, saves time and builds customer satisfaction. Having an efficient system to keep in touch with customers and co-workers, wherever you, or they might be, is good sense and good business. Lost calls mean lost time, errors and lost business. Freedom of movement We all know what it is like to sit at a desk waiting for an important call, it seems like forever! Until recently, you had no choice. You were tied to the telephone on your desk. New cordless PABX technology can free you from your desk, so that you can get the job done wherever needed, without losing contact with co-workers or customers. Cordless PABXs provides a companys workers with freedom of movement and enhanced, full-function, communications. Factories normally have only a few fixed telephones on the shop floor. These have to serve everyone. Tracking a supervisor as he walks through the factory is troublesome and time consuming, but if he carries a PABX connected cordless phone he can always be reached at his extension. With a wireless phone in hand, changes can be made quicker, up-to-the-minute information received, advice received and problems solved on the spot, or help can be called for faster. Production line time can be reduced and productivity increased. Controlled, cordless, telephone access and the mobility and flexibility it provides makes the day-to-day work routine a little easier, more efficient, productive and in the long run, less costly. DECT and the PABX There is a new state-of-the-art standard for private cordless communications technologies called DECT or Digital Enhanced Cordless Telephony. The DECT standard was developed by telecommunications manufacturers, regulators and system operators working together as members of the European Telecommunications Standards Institute – the ETSI. The DECT technology standard covers a wide range of applications including not only wireless PABXs, but also wireless residential communications systems and wireless local loop telephony. DECT based PABXs provide the user with a wide range of functions: automatic ring back, group membership/ group calling, executive/secretary privileged channels and 3-party conference calling, are just a few of the features that a “DECT” PABX can provide. Generally speaking, if you can do it on a standard PABX you can do it, with full wireless mobility, on a DECT system PABX. DECT is a robust technology that provides corporate users with a variety of important features: high traffic density, security, seamless hand-over and high quality, crystal clear, digital voice reception in the most demanding environments. DECT installations work with much smaller cells, true micro-cells, than public cellular systems. As a result, a limited range of frequencies can be used more efficiently, and more people in a given area can use the telephone system at the same time. DECT based equipment can change channels during a call. This is called “handover.” Handover adds mobility to DECT systems. If you are using the phone you will never notice the handover. It happens “seamlessly” as you move from one cell to another or, within a given cell, to optimise reception quality. Specialized circuits in the handsets constantly evaluate the quality of the channels available within the cell. When a handset detects an available channel with higher quality than the one it is using it “asks” the system controller to use the higher quality channel. Security Security is one of the strong points of DECT systems. The DECT standard includes a three-layer security system consisting of: Subscription verification Authentication of user access Encryption The subscription procedure verifies the handsets access rights and user identity. To communicate with the system, a handset must be recognised as a subscriber by a specialized DECT routine. Handsets can be designed to permit more than one subscription. During every call setup the base station checks the identity of the user. This authentication process, which works without sending the user identification over the air, protects access to the system. Finally, after the handsets subscription has been verified and the users identity authenticated, the conversation is encrypted, to guarantee confidentiality, and then transmitted. Conclusion The DECT PABX can be configured to provide internal paging functions. Short messages can be sent for display on handsets with visors or screens. This same facility can, in the future, be adapted by software to re-transmit messages received through Internet compatible devices linked to the PABX.

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