20-12-2012, 05:53 PM
FILTERING UNWANTED PACKETS ON ATM NETWORK
1FILTERING UNWANTED.ppt (Size: 1.26 MB / Downloads: 80)
Introduction
ATM – Asynchronous Transfer Mode
a high speed, connection - oriented switching and multiplexing technology
capable of transmitting voice, video and data and
interconnecting LAN’s
ATM – Definition
A transfer mode in which information is organized into cells;
It is asynchronous in the sense that the recurrence of cells containing information from an individual user is not necessarily periodic.
Asynchronous Transfer Mode
Pre-assigned “slots,” frame boundaries, global timing
Slots identified by position from the start of the frame
BW allocated in units of slots
Idle slots wasted
Efficient for Constant Bit Rate traffic
Features and Benefits of ATM
Convergence of Voice , Video and Data on one network
High speed switching at hardware level
Bandwidth on demand
Predefined and guaranteed QoS.
Superior Management features
Scalability in network size and speed
Ease of integration with other technologies
Proposed System
In this system two different algorithms are proposed
1. Leaky bucket algorithm
continuously receives and sends the data at the particular interval of time to avoid congestion or flooding of data.
2. Virtual scheduling algorithm.
monitors the congestion occurrence, when congestion occurs it intimates or warns user and simultaneously intimates when the router is free and data transferred successfully to destination.
PROBLEM STATEMENTS
Each ATM cell can pass through one or several ATM switches during end –end transmission
Cells can be processed through buffers(queues) in ATM switches introducing variable delays to the ATM cell traffic throughout entire ATM network.
When data transfers between source and destination there may be chances of occurrence of congestion and also to monitor when congestion occurs.
The rate corresponds to the traffic cell rate parameter.
CONCLUSION:
The proposed architecture had thus introduced advanced protocol specifications to route the data in, emulate connectionless media, inter work ATM with existing LAN and WAN technologies, and guarantee the quality of service delivered across ATM backbones.