And the fixed size of the packets arose out of hidden motivation from the

And the fixed size of the packets arose out of hidden

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with short fixed length packets." And the fixed size of the packets arose out of hidden motivation from the telecommunications companies to sustain the same transmitted voice quality as in STM networks, but in the presence of some lost packets on ATM networks. Thus two end points in an ATM network are associated with each other via an identifier called the "Virtual Circuit Identifier" (VCI label) instead of by a time-slot or bucket number as in a STM network. The VCI is carried in the header portion of the fast packet. The fast packet itself is carried in the same type of bucket as before, but there is no label or designation for the bucket anymore. The terms fast packet, cell, and bucket are used interchangeably in ATM literature and refer to the same thing. Advantages of ATMFast packet switching is attempting to solve the unused bucket problem of STM by statistically multiplexing several connections on the same link based on their traffic characteristics. In other words, if a large number of connections are very bursty (i.e. their peak/average ratio is 10:1 or higher), then all of them may be assigned to the same link in the hope that statistically they will not all burst at the same time. And if some of them do burst simultaneously, that that there is sufficient elasticity that the burst can be buffered up and put in subsequently available free buckets. This is called statistical multiplexing, and it allows the sum of the peak bandwidth requirement of all connections on a link to even exceed the aggregate available bandwidth of the link under certain conditions of discipline. This was impossible on an STM network, and it is the main distinction of an ATM network. ATM has several key benefits:One Network-ATM will provide a single network for all traffic types-voice, data, video. ATM allows for the integration of networks improving efficiency and manageability.Enables new applications-Due to its high speed and the integration of traffic types, ATM will enable the creation and expansion of new applications such as multimedia to the desktop.Compatibility-Because ATM is not based on a specific type of physical transport, it is compatible with currently deployed physical networks. ATM can be transported over twisted pair, coax and fiber optics.Incremental Migration-Efforts within the standards organizations and the ATM Forum continue to assure that embedded networks will be able to gain the benefits of ATM incrementally-upgrading portions of the network based on new application requirements and business needs.Simplified Network Management-ATM is evolving into a standard technology for local, campus/backbone and public and private wide area services. This uniformity
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is intended to simplify network management by using the same technology for all levels of the network.Long Architectural Lifetime-The information systems and telecommunications industries are focusing and standardizing on ATM. ATM has been designed from the onset to be scalable and flexible in:Geographic distanceNumber of users
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