Iometrix Certifies MRV Metro Ethernet Products for Ethernet in First Mile Applications.

OptiSwitch 9000 Series and Fiber Driver Successfully Complete Testing Based on IEEE Standards

CHATSWORTH, Calif. -- MRV COMMUNICATIONS, INC. (Nasdaq:MRVC), a leading provider of products and services for out-of-band networking, WDM and optical transport, metro Ethernet, fiber optic components, 10GE and other service aware networking products, today announced that both the OptiSwitch[R] 9000 and the Fiber Driver[R] metro Ethernet systems successfully passed compliance tests of the Iometrix Test Suite for Ethernet in the First Mile Operations, Administration & Maintenance (OAM) and are certified compliant for all IEEE 802.3ah service provider applications.

Ethernet OAM is vitally important to carriers, as it encompasses all tools and utilities necessary to install and monitor an entire Metro Ethernet network from a centralized location. The result is the ability to maintain a network running at maximum efficiency without requiring truck rolls to solve every off-site issue, thus, greatly reducing expense to network administrators. MRV's Fiber Driver Metro Ethernet services demarcation devices and its OptiSwitch carrier aggregation systems both feature full OAM capabilities and, thus, establish link continuity from central office to demarcation point. Previously these services were terminated at the aggregation point and restarted, adding to configuration time and expense.

"These tests give MRV the opportunity to demonstrate that its products deliver the absolute standards compliance and interoperability needed for carrier-scale metro Ethernet networks," said Noam Lotan, president and CEO of MRV Communications. "The OAM features we've built into the OptiSwitch and Fiber Driver products help carriers keep operating expenses low, while their rich set of features gives carriers the utmost flexibility for services delivery."

"MRV's compliance with these specifications assures that its product line is carrier class, as it has passed the full set of mandatory requirements defined in the Iometrix IO Ethernet in the First Mile Certification Test Program," said Bob Mandeville, president and founder of Iometrix. "IO certification assures service providers that the hardware they are purchasing will enable them to manage subscriber access based on the current 802.3ah Ethernet standards for OAM."

The Iometrix IO Ethernet in the First Mile Certification Test Program is a set of 128 requirements that are part of IEEE 802.3ah Ethernet in the First Mile standard and its allowable extensions.

About the OS9000

The OptiSwitch 9000 is an intelligent, versatile, and powerful carrier-class/metro Ethernet Services switch with a comprehensive traffic management suite. Distributive software and hardware architecture along with the incorporation of cutting-edge Ethernet services technology enable it to meet current and future needs. Robust and highly flexible, it can readily be applied to provide IP multimedia services, intelligent Layer 2 switching, and advanced QoS services to enable optimized Service Level Agreements.

About Fiber Driver

The Fiber Driver line of products provides a full range of solutions for media conversion, signal repeating, and fiber-optimization, including CWDM and DWDM systems. Both managed and unmanaged solutions are available, including rack-mount, modular systems and desktop systems. The Fiber Driver line includes several families of products with 100s of modules and system options for any type of optical or copper technology, covering virtually every protocol in use in networking today.

About Iometrix

Iometrix founded by Bob Mandeville in 2003, builds upon the activities of European Network Laboratories (ENL), the authoritative source of network benchmarking since 1991. Based in South San Francisco, California, Iometrix has recently launched its IO Certification Test Suite for the Ethernet in the First Mile (EFM) standard (IEEE 802.3ah). Iometrix is inaugurating its IO Certification Program by testing EFM Operations, Administration, and Management (OAM) compliance. Dedicated to advancing industry testing standards, Iometrix is actively working within industry standards bodies to drive forward the adoption of industry sanctioned benchmarks.

Additional information about Iometrix and IO Certification[TM] can be found at www.iometrix.com.

About the Metro Ethernet Forum:

The Metro Ethernet Forum (MEF) is a global industry alliance comprising of approximately 70 organizations including telecommunications service providers, network equipment/software manufacturers, semiconductors vendors and testing organizations. The MEF's mission is to accelerate the worldwide adoption of Carrier-class Ethernet networks and services. The MEF develops the Carrier Ethernet technical specifications and implementation agreements to promote interoperability and deployment of Carrier Ethernet worldwide.

For more information about the Forum, including a complete listing of all current MEF members, please visit the MEF web site at www.MetroEthernetForum.org.

About MRV Communications, Inc.

MRV Communications, Inc. ("MRV") is a leading provider of network equipment and services, and optical components. MRV's networking business provides equipment used by commercial customers, governments and telecommunications service providers, and includes switches, routers, physical layer products and out-of-band management products as well as specialized networking products for aerospace, defense and other applications including voice and cellular communication. MRV's optical components business provides optical communications components for metropolitan, access and Fiber-to-the-Premises applications, through its wholly owned subsidiary LuminentOIC, Inc. MRV markets and sells its products worldwide through a variety of channels, including a dedicated direct sales force, manufacturers' representatives, value-added-resellers, distributors and systems integrators. MRV also has operations in Europe that provide network system design, integration and distribution services that include products manufactured by third-party vendors, as well as internally developed and manufactured products. Publicly traded since 1992, MRV is listed on the NASDAQ Global Market under the symbol MRVC. For more information about MRV and its products, please call 818-773-0900 or visit our websites at www.mrv.com and www.luminentoic.com.