How do ATM switches differ from IP routers in B-ISDN? (original) (raw)

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Broadband ISDN (B-ISDN) is a network architecture that uses asynchronous transfer mode (ATM) to deliver high-speed data, voice, and video services. ATM is a packet-switching technology that divides data into fixed-length cells and routes them through a network of ATM switches. IP routers, on the other hand, are devices that forward packets of variable length based on their destination addresses. How do ATM switches differ from IP routers in B-ISDN? In this article, we will explore some of the key differences and advantages of each technology.

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ATM/IP integration

ATM and IP are not mutually exclusive technologies, but can be integrated to leverage their respective strengths. For example, ATM can be used as a transport layer for IP, providing quality of service and efficiency for IP packets, while IP can be used as a control layer for ATM, providing routing and signaling functions for ATM VCs. There are several methods to achieve this integration, such as classical IP over ATM which assigns each IP host an ATM address and uses an address resolution protocol (ARP) server to map IP addresses to ATM addresses. Multiprotocol over ATM (MPOA) extends this method by allowing IP routers to establish VCs across multiple ATM switches, while IP switching combines ATM switching and IP routing in a single device.

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