Sorrento Networks Selects Lattice’s Ethernet Over SONET Capability for Gigamux DWDM System

Quad Gigabit Ethernet over SONET/SDH solution in ORCA® Series 4 FPGA deployed in Sorrento's access multiplexers

HILLSBORO, OR -- January 27, 2003 - Lattice Semiconductor (Nasdaq:LSCC), the leading supplier of integrated programmable logic and SERDES solutions, today announced that Sorrento Networks (Nasdaq NM: FIBR), a leading supplier of intelligent optical networking solutions for metro and regional applications, has selected Lattice's Quad Gigabit Ethernet over SONET/SDH system solution for deployment in Sorrento's access multiplexer family of products for moving Gigabit Ethernet traffic over SONET/SDH and DWDM networks. The complete solution consists of a high-performance ORCA 4 Series FPGA plus a Lattice proprietary intellectual property (IP) core.

"We integrated the Lattice Quad Gigabit Ethernet technology into our Gigabit Ethernet products in order to offer a robust and differentiated GbE transport solution for metro networks," said Demetri Elias, vice president of marketing at Sorrento Networks. "Sorrento's GMGE4-2.5G module is a 4-port, fractional- and full-rate Gigabit Ethernet multiplexer that seamlessly connects to a SONET/SDH network and enables extended GbE transport applications over metro and regional networks. Lattice's technology has been proven in Sorrento's customer applications since August 2002," commented Elias.

The Lattice technology was the starting point for Sorrento's Gigabit Ethernet solution, which includes interconnection to both SONET/SDH and GbE networks, encapsulation of Ethernet frames into the SONET/SDH format using the Packet-over-SONET/ SDH (PoS) methodology, ingress and egress packet buffering at each SONET/SDH to GbE interface, error checking, and three types of flow control across the fiber link and into the GbE network. The bridge is implemented in two ORCA® Series 4 FPGAs.

Each Series 4 device handles two bi-directional GbE streams and performs two primary functions: translation between the Ethernet and the SONET networks, and flow control (backpressure mechanism) to ensure proper dataflow between the Ethernet network and the SONET network. The code programmed into each of the FPGAs is identical and performs all of the handshaking between the GbE devices and the SONET/SDH devices. Also included in the FPGA core is the handling of rate mismatches between the GbE networks on opposite ends of the SONET/SDH fiber connection, control of the data buffering, flow control between the two GbE networks on opposite ends of the SONET/SDH fiber connection, and the optional discarding of errored packets received from the GbE MAC before transmission across the SONET/SDH fiber. Programmability provides users with the flexibility to introduce changes to their design quickly based on changing specifications and changes in customer requirements.

"Lattice is pleased to provide Sorrento with the tools for quickly deploying GbE over SONET/SDH technology in their GigaMux platform," said Stan Kopec, vice president of marketing at Lattice Semiconductor. "The ORCA Series 4 FPGAs were designed from the start for complex networking applications, like GbE over SONET/SDH. It is the best FPGA available for networking applications, and combined with our networking and system-level IP expertise, provides the best value in the communications industry."

ORCA FPGAs provide customers with the ideal platform and flexibility to implement emerging standards like data over SONET/SDH, while not being limited by the inflexibilities and long turnaround times of ASSPs. The Quad Gigabit Ethernet over SONET/SDH capability from Lattice is the leading solution available, allowing customers to efficiently map four channels of Gigabit Ethernet into a 2.5 Gbps SONET/SDH pipe. "We welcome challenges like this because we have the answers that get customers to market quicker," added Kopec.

Sorrento Networks' GigaMux is a metro and regional Dense Wavelength Division Multiplexing (DWDM) platform that transforms any fiber plant into a high-performance, multi-protocol transmission network with up to 64 times the transmission capacity. GigaMux is a compact, flexible, and cost-effective system based on a "pay-as-you-grow" architecture. Working in conjunction with GigaMux is the EPC product family, consisting of sub-rate aggregation multiplexers that increase bandwidth utilization by combining a wide variety of traffic for transmission over a single wavelength, including Gigabit Ethernet, ESCON, Fast Ethernet, Fibre Channel, and SONET/SDH channels.

About Sorrento Networks
Sorrento Networks, headquartered in San Diego, is a leading supplier of intelligent optical networking solutions for metro and regional applications worldwide. Sorrento Networks' products support a wide range of protocols and network traffic over linear, ring and mesh topologies. Sorrento Networks' existing customer base and market focus includes communications carriers in the telecommunications, cable TV and utilities markets. The Storage Area Network (SAN) market is addressed through alliances with SAN system integrators. Recent news releases and additional information about Sorrento Networks can be found at www.sorrentonet.com.

About Lattice Semiconductor Corporation
Oregon-based Lattice Semiconductor Corporation designs, develops and markets the broadest range of high-performance ISPTM Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs) and Field Programmable System Chip (FPSC) devices. Lattice offers total solutions for today's system designs by delivering the most innovative programmable silicon products that embody leading-edge system expertise.

Lattice products are sold worldwide through an extensive network of independent sales representatives and distributors, primarily to OEM customers in the fields of communication, computing, computer peripherals, instrumentation, industrial controls and military systems. Company headquarters are located at 5555 NE Moore Court, Hillsboro, Oregon 97124 USA; Telephone 503-268-8000, FAX 503-268-8037. For more information on Lattice Semiconductor Corporation, access our World Wide Web site at www.latticesemi.com.

Statements in this news release looking forward in time are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Investors are cautioned that forward-looking statements involve risks and uncertainties including customer's demand for our new products, our dependencies on our silicon wafer suppliers, the impact of competitive products and pricing, technological risks and other risk factors detailed in the Company's Securities and Exchange Commission filings. Actual results may differ materially from forward-looking statements.

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