| On Sunday, Microsoft, the world's leading computer software company, announced plans to work closely with various hardware manufacturers to deliver on Microsoft's plans to use its software to simplify the manner in which workers communicate between themselves. Microsoft has announced partnerships with Hewlett-Packard, Motorola, and other hardware manufacturers to create the hardware necessary to work with the Microsoft integrated communication systems software. Microsoft's movement into the telephone market puts the company in face to face competition with Cisco Systems as well as some other competitors that are seeking to capitalize on the seeming shift by some larger businesses to utilize cheaper Internet-based telecommunications.
Wireless telephones DECT:
Wireless telephone DECT are a system, consisting of a base region with telephone lines from a city automatic telephone exchange, and one or several wireless sets which can communicate among themselves and can call external lines. They work at a frequency of 1880-1900MHz. The range is approximately 50- 300meters.
ISDN
A system entailed for increasing the quality of a telephone connection and permitting simultaneously the sending of data while a conversation goes on through one and the same line. It has two logical links for transmission of each 64kbt/s and which can be used for conversation and data transmission by choice, and also a signaling link of 16kb through which the service and control data is transmitted. If to use both channels for data transmission, the speed works out to be 128kbt/s or approximately 4 times more than the speed of a usual modem.
Wireless communication system:
The wireless communication system is meant for providing a user with connection at any location. It consists of a large number of base stations linked with each other by a central circuit exchange and cellular telephones. The cellular telephone, when switched on, registers itself with the nearest base station and if a call is coming, the central circuit exchange locates the telephone and calls through the nearest base station. While moving in the city the cellular telephone is transferred from one base station to another without losing the network and even when a conversation is on (hands free function).
IP telephony (VoIP0)
The technology assigned to transfer voice digitalized and compressed by digital methods, based on IP technologies, through networks. This system very much cheapens long distance telephone calls. Among the drawbacks are problems of signal delays due to the peculiarities of IP Telephony. Starting from 2005 usage of special programs (Skype) made IP-telephony virtually cheap.
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full view please its clarity and quality is decreases while reducing the image for the contest direction...
