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Very Short Reach Optics Standard. (Network news).

An agreement reached on a new global standard for very short reach optical interfaces intended for intra-office applications is in making optical technology economically effective. Ever-growing bandwidth demands and higher data rates from 2 Gigabit per second (Gbit/s) to 10 G-bit/s and even 40 Gbit/s are driving the migration from electrical to optical intra-office connections. Moreover the number of intra-office links will increase as a consequence of the total growth of network capacity and the evolution towards the Automatic Switched Optical Network, resulting in the deployment of optical switches and transmission terminals in the same offices. Known as ITU-T G.693, the agreement will enable manufacturers to support this migration with interoperable equipment designs.

The standard addresses the urgent need for low cost high speed optical links to interconnect colocated equipment such as routers, Dense Wavelength Division Multiplex terminals and Synchronous Digital Hierarchy (SDH) add-drop multiplexers. Interface specifications in Recommendation ITU-T G.693 cover a wide range of optical attenuation values so that interfaces can be optimized for each specific application reducing overall cost. The new standard focuses on target link distances up to 2 km. Other existing ITU-T standards on optical interfaces address longer link distances.

This standard has been agreed under the fast-track approval procedure called AAP. Under this procedure, a comment period is initiated when a study group gives consent to approve the draft text of a recommendation which it considers mature. The combined announcement and comment period take just under two months. The ITU-T G.693 is therefore expected to become effective before the end of the year if the comment period yields a positive outcome.
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Publication:Database and Network Journal
Article Type:Brief Article
Date:Dec 1, 2001
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