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Understanding Signalling Functions and Address Formats in Virtual Circuit Networks

In this chapter, you will learn about the key functions of signalling and control within virtual circuit networks. We will cover the importance of signalling standards such as ITU-T and Q.2931, and explore address formats relevant to point-to-point and point-to-multipoint calls. You'll gain insights into establishing, maintaining, and clearing virtual circuits, along with understanding the traffic contract, which defines the bandwidth and QoS class for data transmission. Enhance your knowledge of UNI and NNI signalling control functions essential for efficient network communication.

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Understanding Signalling Functions and Address Formats in Virtual Circuit Networks

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  1. Chapter Objectives • After completing this chapter you will be able to: • Describe signalling functions and signalling control functions • Outline address formats • Describe signalling for point-to-point and point-to-multipoint calls

  2. Signalling Functions • Switched Virtual Circuits (SVCs) require the use of signalling standards:- • ITU-T • Q.2931 • ATM Forum • UNI V3.0, V3.1 and V4.0 • Signalling flavours • UNI • NNI

  3. Signalling Control Functions • Establishing a virtual circuit • Status report for a virtual circuit • Maintaining a virtual circuit • Clearing a virtual circuit

  4. Address Formats D.C.C. Format High order DSP AFI DCC E.S.I. Sel. IDI DSP IDP I.C.D. Format High order DSP AFI ICD E.S.I. Sel. IDI DSP IDP E.164 Format AFI E.164 ISDN Number E.S.I. Sel. High order DSP IDI DSP IDP 48-bit ‘MAC’ address

  5. Call Set-up Calling Party Called Party UNI UNI Set-up Internal Set-up (PNNI?) Release OR Call Proceeding Set-up Release OR Call Proceeding Release OR Call Proceeding Connect Connect Connect ACK Connect Connect ACK Connect ACK

  6. Call Release Calling Party Called Party UNI UNI release release Release complete release Release complete Release complete

  7. Drop Party Release) Release) Release Complete Release Complete Release Complete Point-to-Multipoint Connections ROOT Party NEW Leaf UNI UNI Point-to-Point Connection Add-Party Internal Set-up (PNNI?) Set-up Connect Release OR Call Proceeding Add-Party Ack OR Call Proceeding Point-to-Multipoint Connection

  8. The Traffic Contract • Destination address and the traffic contract form the essential parts of call set-up • The traffic contract between user and network establishes: • Virtual bandwidth reserved in each of the forward and backward directions • QoS class for cells in each of the forward and reverse directions

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