By William Stallings
This well timed revision of an all-time best-seller within the box good points the readability and scope of a Stallings vintage. This entire quantity offers the main up to date assurance of the fundamental subject matters in facts communications, networking, web know-how and protocols, and criteria – all in a handy modular layout. good points up-to-date assurance of multimedia, Gigabit and 10 Gbps Ethernet, WiFi/IEEE 802.11 instant LANs, protection, and lots more and plenty extra. perfect for pro reference or self-study. For Product improvement body of workers, Programmers, structures Engineers, community Designers and others taken with the layout of information communications and networking items.
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Additional info for Data and Computer Communications (8th edition)
However, developing switching systems with the capacity and rapid response to support these increased requirements is a challenge not yet conquered. The opportunities for using networks as an aggressive competitive tool and as a means of enhancing productivity and slashing costs are great. The manager who understands the technology and can deal effectively with vendors of service and equipment is able to enhance a company’s competitive position. In the remainder of this section, we provide a brief overview of various networks.
With circuit switching, only fixed-data-rate circuits are available to the end system. ATM allows the definition of multiple virtual channels with data rates that are dynamically defined at the time the virtual channel is created. By using small, fixed-size cells, ATM is so efficient that it can offer a constant-data-rate channel even though it is using a packet-switching technique. Thus, ATM extends circuit switching to allow multiple channels with the data rate on each channel dynamically set on demand.
It is counterproductive because the overhead involved soaks up a significant fraction of the high capacity provided by the network. Frame relay was developed to take advantage of these high data rates and low error rates. Whereas the original packet-switching networks were designed with a data rate to the end user of about 64 kbps, frame relay networks are designed to operate efficiently at user data rates of up to 2 Mbps. The key to achieving these high data rates is to strip out most of the overhead involved with error control.