Integrating voice and data networks pdf
Cisco & End to End Networks - Voice and Data Solutions
Highly Efficient Voice—Data Integration over Medium and High Capacity Wireless TDMA Channels
Voice over Internet Protocol VoIP , also called IP telephony , is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol IP networks, such as the Internet. The terms Internet telephony , broadband telephony , and broadband phone service specifically refer to the provisioning of communications services voice, fax , SMS , voice-messaging over the public Internet, rather than via the public switched telephone network PSTN , also known as plain old telephone service POTS. The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding. Instead of being transmitted over a circuit-switched network , the digital information is packetized and transmission occurs as IP packets over a packet-switched network. They transport media streams using special media delivery protocols that encode audio and video with audio codecs and video codecs. Various codecs exist that optimize the media stream based on application requirements and network bandwidth; some implementations rely on narrowband and compressed speech , while others support high-fidelity stereo codecs.
Wireless Networks. A new medium access control MAC protocol for mobile wireless communications is presented and investigated. We explore, via an extensive simulation study, the performance of the protocol when integrating voice and data traffic over two wireless channels, one of medium capacity referring mostly to outdoor microcellular environments and one of high capacity referring to an indoor microcellular environment. Data message arrivals are assumed to occur according to a Poisson process and to vary in length according to a geometric distribution. We evaluate the voice packet dropping probability and access delay, as well as the data packet access and data message transmission delays for various voice and data load conditions. By combining two novel ideas of ours with two useful ideas which have been proposed in other MAC schemes, we are able to remarkably improve the efficiency of a previously proposed MAC scheme , and obtain very high voice sources multiplexing results along with most satisfactory voice and data performance and quality of service QoS requirements servicing. Our two novel ideas are the sharing of certain request slots among voice and data terminals with priority given to voice, and the use of a fully dynamic low-voice-load mechanism.
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