Yurie's new access concentrator unlocks the potential of ATM wide area networks.

LANHAM, Md.--(BUSINESS WIRE)--Aug. 26, 1996--Yurie Systems, Inc., a leading manufacturer of ATM access products, will ship a new access concentrator in September that will let service providers and end-users realize the still-untapped potential of ATM wide area networks and services.

Currently, most wide-area synchronous transfer mode (ATM) backbone networks are used solely for frame-relay transport. By supporting many types of network traffic, Yurie's new LDR200 access concentrator lets local phone companies, long distance carriers and Internet service providers offer their customers a new class of cost-saving voice, data and video services over an ATM backbone. End-user organizations can also deploy the product to access private and/or public ATM services.

The LDR200's broad array of interfaces allows the device to simultaneously transmit multiple data, voice and video circuits through one ATM backbone. The combination of circuit consolidation over ATM and Yurie's traffic-management technology can ease network management and save money -- in some cases, hundreds of thousands of dollars per site each year.

The most significant distinction between the LDR200 and competitive access products is AQueMan(TM), Yurie's patent-pending adaptive queuing and prioritization algorithm. AQueMan improves earlier buffer-management schemes by establishing separate queues for delay-sensitive voice traffic and loss-sensitive data traffic, and implementing statistical multiplexing of cells within the queues according to weighted priorities.

Independent testing by the Naval Research Laboratories has confirmed AQueMan's effectiveness under extreme traffic loading. In actual Department of Defense (DoD) deployments, Yurie's products have effectively managed traffic flow to and from DoD satellite links, even when the sum of the inputs was hundreds of times greater than the low-speed satellite circuit.

AT&T Defense Markets chose Yurie's product as the access platform for its emerging turnkey ATM service offering. "Our Department of Defense ATM network service offerings will provide efficient, reliable and cost effective transmission for multiple traffic types to meet the demanding requirements of our users," said Kevin McManus, assistant vice president, AT&T Defense Markets. "Yurie's access platform is key in providing our customers access not only to the AT&T InterSpan ATM network, but also to the Defense Information System Network (DISN) and special DoD networks, as our customers migrate toward ATM solutions."

Interfaces supported in the first release of the LDR200 include T1, T3, RS530, V.35, RS449/422 and RS232. Ethernet, analog voice and ISDN Primary Rate interfaces are scheduled to be available in early 1997. Protocols supported in the first release include ATM CBR, VBR and UBR, as well as frame relay and HDLC.

Other LDR200 features will include LANET, a framing algorithm developed by Yurie for low-speed and wireless ATM links; virtual circuit level encryption; forward error correction and record storage for billing and network design.

Yurie's LDR200 access concentrator is manageable from any Simple Network Management Protocol platform, such as HP OpenView or SunNet manager.

The LDR200 access concentrator will ship in September. The base platform is a 7-inch high, dual-bus ATM switching matrix, with each bus operating at 622 Mbps for a total throughput of 1.2 Gbps. The 12-slot, 19-inch platform has a list price of $30,000 to $90,000 depending on configuration. A 23-inch version with 16 slots is planned for early 1997. Both units offer redundant buses, power supplies, timing, central processing units and user interface modules.

Yurie's product family also includes the mid-range LDR 100, which has a bus-based ATM switching matrix operating at 64 Mbps. The 10-slot LDR100 access concentrator has been available since early 1995 and lists for $20,000 to $50,000, depending on configuration. A low-end LDR5, tailored for small remote sites, is available for $5,000 to $10,000.

Yurie Systems designs, manufactures, markets and services ATM access platforms for telecommunications providers, government agencies and corporate end users. Yurie shipped its first ATM access platform in February 1995. Yurie's products are deployed worldwide by customers such as AT&T Corp.'s Federal Markets, various non-military Department of Defense agencies, the U.S. Navy, U.S. Army, U.S. Air Force and the North Atlantic Treaty Organization. -0-

Note to editors: AQueMan is a trademark of Yurie Systems, Inc. All other products mentioned are trademarks or registered trademarks of their respective owners.

CONTACT: Yurie Systems, Inc., Lanham

Joe Miller, 301/352-4661 or [e-mail]

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Buerger Media & Marketing, Inc.

Maggie Buerger, 770/495-7494 or [e-mail]