ATM looks for niche in LAN/WAN market By Stephen Lawson InfoWorld Electric
infoworld.com
Posted at 5:30 PM PT, May 31, 1998 Asynchronous Transfer Mode, once considered the key to communicating across all networks, is expected to continue playing a role, albeit diminished, in LANs and WANs despite the increasing popularity of powerful and intelligent IP devices.
However, many enterprises and service providers are looking to Gigabit Ethernet, optical networks, and emerging IP quality of service as alternatives to ATM's traditional strengths.
"In the long term, we're interested in alternatives to ATM because we pay a significant overhead penalty for carrying ATM," said Vinton Cerf, senior vice president of MCI. "I'm quite convinced that we can implement similar functionality in other than ATM switches."
MCI is planning to test Lucent's PacketStar IP Switch, introduced last week, as a possible solution. The Layer3/Layer 4 switch, which promises to route as many as 32 million packets per second, is among the first of what is expected to be a series of such large IP WAN devices.
Despite this, vendors will use this week's ATM Year 98 conference in San Jose, Calif., to roll out next-generation products that will extend the capabilities of ATM. And observers said that for the foreseeable future, ATM will continue to be critical.
"If you're a service provider and you have to handle both IP and other traffic, ATM is the best solution," said Ron Jeffries, principal analyst at Jeffries Research, in Arroyo Grande, Calif. Because ATM can transparently carry non-IP traffic, many service providers that turn to pure IP will maintain parallel ATM networks, he said.
But IP and Ethernet are unlikely to match ATM's capability to carry voice, video, and data, another analyst predicted.
"You'll be able to do 90 percent of what an ATM network delivers, but it'll never be as good as ATM on multimedia," said Michael Howard, president of Infonetics, in San Jose.
"ATM is here for the long run, but it won't be the overall winner anywhere," Howard said.
One technology analyst said his company uses ATM for WAN services in some cases but not in LANs.
"We don't feel ATM inside the building is worth the expense," said Eric Kuzmack, a senior analyst at a Fortune 250 publishing company.
A consortium of automotive companies recently set down parameters for determining whether ISPs can deliver the quality of service needed for high-availability and multiservice networks. The Automotive Industry Action Group is using the parameters to certify service providers that want to participate in its Automotive Network Exchange.
At ATM Year 98, Cabletron will introduce the SmartSwitch 9500 as the first shipping product of a strategy to supply ATM hardware from the desktop to the carrier core.
The 9500 finally brings to the SmartSwitch 9000, formerly the MMAC-Plus, the long-awaited Cell Transfer Matrix (CTM) ATM backplane. Cabletron said the passive backplane's throughput can scale beyond 75Gbps.
The switch can be fitted with ATM modules that each include a 4.5Gbps switching fabric. Interfaces, available separately to plug in to the modules, include DS-3, OC-3, and OC-12. Officials said Cabletron will ship OC-48 interfaces for the modules in July.
Each 9500 will ship with both the CTM and a packet-based backplane, allowing enterprises to mix Ethernet, Token Ring, FDDI, and ATM on the same switch. The CTM can also be added to an existing MMAC-Plus or SmartSwitch 9000.
The 9500 is available now, priced at $9,995 for a 14-slot chassis. Modules will cost about $19,000.
General DataComm will enhance the voice-carrying capabilities of its Apex ATM switches. The carrier backbone switches will be able to compress a 64Kbps voice channel to 8Kbps using a standard ATM technology, AAL2.
The higher compression ratio will allow service providers to carry voice traffic more efficiently, potentially lowering the cost to customers of leased connections across a WAN.
Other companies offer 8Kbps compression capability today on their switches but only using a nonstandard method, according to industry observers.
HyNex will announce it is adding voice support to its Hunt 7100 ATM Network Termination Unit, an ATM access device for customer sites that includes traffic shaping and WAN priority settings. The Hunt 7100 is designed for service providers to offer and bill for end-to-end quality of service.
Cabletron Systems Inc., in Rochester, N.H., can be reached at (603) 332-9400 or cabletron.com. General DataComm Inc., in Middlebury, Conn., can be reached at (203) 574-1118 or gdc.com. HyNex Ltd., in Shefayim, Israel, is at hynex.com.
Stephen Lawson is a senior writer for InfoWorld.
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