FREMONT, Calif., May 23 -- The Optical Internetworking Forum (OIF) announced that twenty-five vendor companies participated in the initial interoperability testing of the optical User Network Interface (UNI) protocol. The testing was held at the University of New Hampshire's Interoperability Laboratory, in Durham, N.H., on May 7-11. All vendors that participated were able to successfully demonstrate Optical UNI interoperability. These companies will go on to demonstrate interoperability at SuperComm 2001 in Atlanta on June 5 - 7 in OIF's booth #150D in the Georgia Dome. "The UNI will revolutionize the optical transport network, allowing carriers to offer advanced optical network services across multivendor, multitechnology networks," said Adam Dunstan, president of the OIF and vice president of technology for Avici. "The OIF is breaking new ground with the first interoperable demonstration witnessed by the industry. It is great to see such a high level of commitment and support from both the vendor and carrier communities for this technology." The following companies will participate in the OIF interoperability demo at SUPERCOMM 2001; Agilent Technologies, Alcatel, Avici Systems, CIENA Corporation, Cinta Networks, Cisco Systems Inc., Coriolis Networks Inc., Corvis Corporation, Data Connection Ltd., Geyser Networks, Huawei Technologies Co Ltd., Lucent Technologies, Metro-OptiX Inc., Nortel Networks, ONI Systems Corp., Optisphere Networks Inc., Optivera Technologies, Redback Networks Inc., Spirent Communications, Sycamore Networks Inc., Tellium Inc., Tenor Networks, Turin Networks Inc., Village Networks Inc. and Zaffire, Inc.