Chapter Objectives l After completing this chapter you

Chapter Objectives l 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

Signalling Functions l Switched Virtual Circuits (SVCs) require the use of signalling standards: – ITU-T l Q. 2931 – ATM Forum l UNI V 3. 0, V 3. 1 and V 4. 0 l Signalling flavours – UNI – NNI

Signalling Control Functions l Establishing a virtual circuit l Status report for a virtual circuit l Maintaining a virtual circuit l Clearing a virtual circuit

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

Call Set-up Calling Party UNI Called Party UNI Set-up Release roceeding l. P OR Cal Interna l Set-u (PNNI? p ) Release roceeding l. P OR Cal ct Conne t onnec C Connect A CK Set-up Release roceeding l. P OR Cal nect Connect A CK

Call Release Calling Party UNI release Release e complet release e mplet o c e s a e Rel releas e plete m o c e s a Rele Called Party

Point-to-Multipoint Connections ROOT Party UNI Point-to-Point Connection Add-Party Ack Add-Party eeding roc OR Call P Internal Set-up (PNNI? ) Release roceeding OR Call P Set-up t Connec Point-to-Multipoint Connection Drop Party Release) omplete Release C NEW Leaf

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