By Abhijit S. Pandya

This textbook offers the entire newest info on all features of every very important part of ATM - the most popular telecommunications know-how of this decade. It demonstrates how ATM internetworks numerous incompatible telecommunications applied sciences and supply the high-speed, excessive bandwidth spine community that the complete telecom is converging towards.

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Thus the “timeout” interval must be balanced between the need to wait for an out-of-sequence packet and the need to request the sender to re-send the missing packet. Figure 2-12 VP and VCI switch. Figure 2-13 Pure VCI switch and no VP switch. Connection-oriented, switch-based networks have no limitation. With sequential delivery guaranteed, if the destination receives packet 1 and then packet 3, packet 2 must be missing in action in the network itself. Immediate steps may be taken by the destination to correct this error condition, which may involve notifying the sender that a retransmission is needed, but not necessarily.

Although it is not expected to be common because its application is not obvious, it is nevertheless allowed to have a pure VC switch in an ATM network. That is, the VP switch function exists but is just a “pass through” while the VCls are reassigned. 13. The network will have more to say about VCls and VPIs when considering the ATM layer in more detail later. When discussing ATM switches, it is always a good idea to keep in mind that these devices are switches, not routers. Recall that the difference in routing is that all hop-by-hop output link decisions are made based on information included in the packet header, and each packet is sent repeatedly through the routing process at each node.

A typical video transmission carries a large amount of information and it is very bursty in nature. ATM technology is well suited for carrying video traffic very efficiently. A high quality video transmission such as a video in High Definition Television (HDTV) format requires in the order of 40 to 100 Mbit/sec bandwidth capacity without any compression. At the present time, transmission of high quality TV broadcast through telephony network requires setting up a communication path between the source and destination at DS3 transmission rate (45 Mbit/s) using Synchronous Transfer Mode.

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