LISLE, Ill., June 7 -- Fujitsu Network Communications, Lucent Technologies, Nortel Networks, Siemens AG, Tellabs, Inc., and Telcordia Technologies have agreed on a specification for a software interface that will allow end-to-end management of multi-vendor SONET and SDH networks for the first time. The companies have made the specification freely available to the public and are contributing the specification to various industry standards bodies and forums. A copy of the specification can be obtained at www.atis.org, contribution number SIF-GN-9802-011 R3.