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4 In a SVC, cells travel paths that are set up spontaneously and torn down again after designated periods. The advantage of this approach is that SVCs occupy switching capacity only when they are set up, increasing switch efficiency and payback on investments. In either case, when a network device, such as a router, wants to send cells to an ATM network, it requests a virtual circuit. That request is passed from initial ATM switches to other ATM switches in the network, with each switch determining whether it can handle the request. If all switches along the path can accommodate the request, the virtual circuit is established. If not, the request must be repeated. This virtual circuit will support a certain QoS that has been preset in the ATM network switches based on user requirements. The most common ATM QoSs are known as constant bit rate (CBR), variable bit rate (VBR), available bit rate (ABR), and unspecified bit rate (UBR). CBR guarantees low delay and the ability to handle a specified cell rate all the time. As long as the traffic falls within the cell rate, the network will handle it. It is intended for voice and high-quality video traffic. VBR is intended for bursty traffic. It allows traffic to burst up to specified rates for specified periods of time before discarding cells. VBR comes in two instances: real time and nonreal time. Real-time VBR limits delay that would hamper certain applications, such as some types of enterprise resource planning systems that require low network delay, plus some forms of video. Nonrealtime VBR is for bursty traffic that is unaffected by delay, such as more traditional LAN traffic or e-mail. UBR is a best-effort QoS. When there is available bandwidth, the switch forwards UBR traffic. UBR is meant to support noncritical applications such as overnight file transfers. Initially, ATM was regarded as a way to send data faster than conventional means within a LAN. However, newer technologies such as Gigabit Ethernet offer the speed advantage without the drawbacks of ATM on the LAN. One of these potential drawbacks is the amount of ATM traffic used for overhead. In addition to the 5 bytes of each 53-byte cell devoted to the header, in some cases 2 bytes or more are used for error checking and some cells are used entirely for sending admin-
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istrative data. All this can consume up to 20 percent of the throughput on a given circuit. This cell tax makes ATM an inefficient transport method for data-only networks where QoS is not an issue. ATM has found a home on the backbone of large WANs and MANs. For example, carriers use ATM networks for transporting multiple types of traffic across long distances. Voice, Frame Relay, and other data traffic are converted into cells and sorted out at the other end of long-haul links. In fact, large carriers are so heavily invested in ATM that they often mask its use under other names due to ATM s failure to achieve marketing buzz. Many more carrier services are ATM-based than users realize. For example, AT&T s IP-enabled Frame Relay is a service that attaches special labels representing groups of user IP addresses to create the illusion of an IP virtual private network (VPN) it is really ATM between AT&T switches. SBC s Project Pronto is sold as a DSL connection to a nearby neighborhood gateway, but it is all ATM from there. Sprint s Integrated On-Demand Network (ION) is pure ATM from the customer premises device out. Standards groups are working on ways to make ATM more attractive in LANs. Multiprotocol over ATM (MPoA) standards let nonATM networks send traffic across an ATM network and tap into ATM QoS guarantees. ATM also has gained more flexibility in the WAN via recent standards. Some ATM carriers now allow users who cannot afford T-3 connections to choose multiples of T-1 bit rates via inverse multiplexing over ATM. And all the large carriers now allow users to keep Frame Relay equipment at some sites and ATM equipment at other sites in a single corporate network. This occurs via a standard called Frame Relay-to-ATM Interworking. Few users will ever realize ATM s early promise of sending all types of traffic over a single network. This is so because ATM took too long to overcome early problems with expensive, hard-to-use equipment, and meanwhile, most efforts to create a single global network shifted to IP. ATM remains a key consideration for users needing to reduce disparate networks today while still enjoying reliable CoSs for different kinds of traffic.
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