ATM     Technology  (advanced)

3 days

ATM Overview
This section introduces the basic concepts behind ATM and their historical development.

Standardisation
An overview of the seven layer OSI model and how ATM relates to the Layer 2. The section includes the structure of the ATM Forum and the ITU standards bodies who developed the technology along with key specifications. The ATM reference model is introduced.

ATM Physical Layer
This section focuses on the Transmission Convergence Sub-Layer and the Physical Media Dependent Sub-Layer, the two specific parts of the Layer 1 protocol needed when using ATM. The use of SDH as the transmission technology used by ATM is discussed.

ATM Layer
This section concentrates on the lower layer of the ATM protocol. The different ATM interfaces, ATM Cell Types and the functions of the 5 byte header are explained.

ATM Adaptation
This section concentrates on the higher layer of the ATM protocol. The ATM Forum Adaptation types are introduced. The Segmentation and Reassembly functions of each AAL are explained and applications given.

Traffic Management
The different Traffic Descriptors are explained and the policing capabilities, including the Connection Admission Control and the Generic Cell Rate algorithms, are discussed. Other Traffic Management applications are detailed such as Queueing, Traffic Shaping and Congestion Indications.

ILMI
The Interim Local Management Interface is discussed giving detail on its protocol stack and functions including connectivity monitoring.

Signalling Q.2931
A review of the Signalling protocol used with Switched Virtual Connections in ATM. An outline of the message structure and types and details regarding the Information Elements and their structures.

PNNI Routing
Looks at the routing function of PNNI covering uplinks, control channels, aggregation, address summarising, anycast, addressing, routing packets, information groups and resource availability.

PNNI Signalling
This covers the signalling interface, the control plane, DTLs, call set up, crankback, soft PVs and setup message examples.

ATM AINI
The Inter-Network Interface. The architecture, messages, message formats and coding is explained, as is the interworking between AINI and B-ISUP and AINI and PNNI.

ATM IMA
The purpose and principle of IMA is explained. There then follows a description of the frame structure, functional blocks, timing reference, cell definition and test pattern procedure.