By Hartmut Brandt
This hands-on e-book specializes in the sensible elements of ATM signalling that community engineers and architects might want to understand now and within the foreseeable destiny. It covers the elemental name keep an eye on capabilities in addition to web Protocol over ATM, LAN emulation, multiprotocol over ATM, and lots more and plenty extra. Case stories also are incorporated to illustrate this know-how in motion.
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Extra resources for ATM Signalling: Protocols and Practice
Each message must contain at least this header; shorter messages trigger exception handling of the protocol. The first byte of the message header is the protocol discriminator. It takes the fixed value of 9 and can be used to route UN1 messages to the UN1 protocol when there are other protocols running on the same SAAL connection besides UNI. The next four bytes contain the call reference. The call reference is an identifier that identifies an ATM call on the given UN1 interface. This call reference is always unique on that interface.
The called system may send an ALERTING message back to the calling system to indicate that it is calling the user (or starting the application or whatever meaning one puts on the telephone term “alerting”). 17). 17:Setting up a point-to-point connection, part3 4. ) it sends a CONNECT message to the network. This message is acknowledged by a CONNECT ACKNOWLEDGE and forwarded to the calling end system. At this point the connection is in the active phase for the called system and the user can start sending ATM cells.
In practice things are not so easy. 5. In ATM usually two kinds of networks are distinguished:public ATM networks and private ATM networks. The differencebetween them is somewhat hzzy. Public networks are usually associated with the big telecom operators; private networks are intranets that are more or less under control of the user. Theprivate ATM network is interfaced to the public ATM network via a UNI, which in this case is called a public UNI. Of course, end systems can be interfaced to the public network directly (see ATM end system A) or via VPI crossconnects (systems B 1 and B2).