ATM Networks (Asynchronous Transfer Mode)

Asynchronous Transfer Mode is a communication standard that uses a high-speed form of packet switching network as the transmission media.
Let us define the ATM network a connection-oriented, packet-switched network with the ability to transport heterogeneous services irrespective of characteristics across the same underlying physical network.
ATM networks were designed with the extremely high quality and high speeds of existing transmission systems in mind, and the potential future trend in the development of a multitude of services with diverse communication requirements, resulting in a flexible and future-safe network.

For taking a seminar on ATM Networks, you need to collect various information on the following points

ATM Adaptation Layer -AAL
ATM Traffic Management
ATM Networks: Issues and Challenges Ahead
ATM Physical Layers
Multiprotocol over ATM -MPOA
ATM Signaling
Private Network to Node Interface -PNNI
ATM Broadband Inter-Carrier Interface
ATM Residential Broadband (RBB)
Voice and Telphony over ATM (VTOA)
Wireless ATM -WATM
ATM Audiovisual Multimedia Services -AMS
ATM Name Service -ANS
ATM Application Programming Interface -API

External References:
http://en.wikipedia.org/wiki/Asynchronous_Transfer_Mode
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=601740
http://www.cs.wustl.edu/~jain/atm/index.html