The purpose of this Recommendation is to provide optical interface specifications to enable transverse (multi-vendor) compatibility of single-channel STM-4, STM-16, and STM-64 inter-office systems using optical preamplifiers and/or opticalbooster amplifiers. Specifications to enable transversely compatible single-channel STM-64 intra-office and short-haul systems not requiring optical amplification are also included.
ITU-T G.691 SPANISH-2006 Referenced Document
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ITU-T G.691 SPANISH-2006 history
2006ITU-T G.691 SPANISH-2006 Optical interfaces for single channel STM-64 and other SDH systems with optical amplifiers