By Hartmut Brandt
This hands-on e-book makes a speciality of the sensible elements of ATM signalling that community engineers and architects might want to understand now and within the foreseeable destiny. It covers the fundamental name keep an eye on services 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 resources for ATM Signalling: Protocols and Practice
This timer is evenlonger than T303 and T31&its minimum value is 3 minutes. Our example end systems are faster, so the CONNECT (which was originally sent by the called system to the network) arrives quite fast in line 10 (now the switch is in state N10). Kirk answers with a CONNECT ACKNOWLEDGEin line 11 after stopping T30 1. At this point the call is active instate U10 anddata can be received andsent. Like the CALL PROCEEDING, the CONNECT ACKNOWLEDGEhas local meaning only. In fact, the switch silently ignores it, because it moved to state N10 when it sent the CONNECT message (this is one of the remaining asymmetries of the protocol).
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). A VPI crossconnect is an ATM switch that switches only VPIs, not VCIs, without signalling support.
It must be noted that the CALL PROCEEDINGmessage has only local relevance; receivingit means two things: the SETUP message was received and is syntactically OK and the access switch is going to forward the SETUP message across the network. The CALL PROCEEDING contains a connection identifier IE. This tells the end system the VPCI and VC1 that will be used for that connection. 2). When the called end systemreceives the SETUP message it can respond with an ALERTING message. This ALERTING message obviously has come from narrowband ISDN, where the user is alerted and the calling user should receive a tone indication that POINT-TO-POINT 43 the remote phone is ringing.