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| ATM – Asynchronous Transfer Mode |
ATM – Asynchronous Transfer Mode
ATM is a high-speed network technology that is designed for LANs, WANs, carrier and service provider networks, and Internet core networks. It is a connection-oriented switching technology, as opposed to a connectionless technology such as IP. ATM creates a virtual circuit (dedicate path) between source and destination across its switching fabric. These circuits can guarantee bandwidth and quality-of-service. ATM cells negotiate ATM switches with the same efficiency, providing several benefits:
- Cell switching is efficient and fast for the reasons just described.
- Traffic flow is predictable due to the fixed cell size.
- Delivery of time sensitive traffic (live voice and video) can be guaranteed.
- ATM includes QoS (quality of service) features that can be used to guarantee bandwidth for certain types of traffic.
ATM was originally defined by the telephone companies and has been heavily promoted by them as an end-to-end networking technology, as well as a voice technology. In this respect, ATM is both a LAN and WAN technology that can potentially allow customers to replace their separate voice and data networks with a single network to handle both voice and data, as well as other multimedia content such as video. There has been great debate over whether ATM is better than IP and vice versa. Many people find this debate odd, since the technologies are quite different and not even in the same protocol layer. The battle is really about whether networks should be connection oriented (ATM) or best effort (IP). More reading, please visit:
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