By Hartmut Brandt
This hands-on e-book specializes in the sensible facets of ATM signalling that community engineers and architects might want to recognize now and within the foreseeable destiny. It covers the fundamental name keep watch over features in addition to web Protocol over ATM, LAN emulation, multiprotocol over ATM, and masses extra. Case stories also are integrated to illustrate this expertise in motion.
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Extra info for ATM Signalling: Protocols and Practice
7 an end system with two ATM interfaces is connected via a crossconnectto one port of an ATM switch. This scenario could be used for high availability or high performance applications (in the case when the link between the crossconnect and the switch has a higher bandwidth than the links between the end system and the crossconnect). In this example the end system keeps a mapping table that relates VPCI values to VPIhnterface pairs. The switch on the other side needs a table that maps VPCI values to VPI values.
Calls in the active phase are in state UlO/NlO, U13/N13 or U14/N14; calls in the release phase are in state U1 UN11 or U12/N12. UO/NO means that the call does not exist. All other states belong to the call establishmentphase. Besides these call states, there is also a state associated with the global call reference. This call reference can be used to reset the entire UN1 stack (and thereby release all connections) or a single ATM connection (that is, a VPINCI pair). 7)). 5 I REST0 REST1 REST2 Null Restart request Restart I Point-to-point Calls The result of a point-to-point call is a bi-directional connection between two ATM end systems.
One thing must be noted: although we have used the (almost) simplest SETUP message, from the protocol point of view we have seen all, even the optional, messages. One of the problems with this type of connection creation is that it takes a quite a long time to come to a state where data can be sent. In the next trace we will go the shortest way to get a working connection. To establish a connection both the CALL PROCEEDING and the ALERTING messages can be omitted. Whether to send a CALL PROCEEDING inresponse to a SETUP is usually a configuration feature of the access switch; to send ALERTING or not is a feature of the end systemsoftware.