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g957sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : G.957
Title : Optical interfaces for equipments and systems relating to the
synchronous digital hierarchy
Study Group : XV - Transmission Systems and Equipment
Version : New
Date of adoption : 1990
Notes :
Recommendation G.957 covers optical interface parameter specifications
for equipments and systems supporting the Synchronous Digital
Hierarchy (SDH) defined in Recommendations G.707, G.708 and G.709 and
operating on single-mode optical fibres conforming to
Recommendations G.652, G.653 and G.654.
The purpose of Recommendation G.957 is to provide specifications for
the optical interfaces of SDH equipment, described in
Recommendations G.782 and G.783, and line systems described in
Recommendation G.958, to achieve the possibility of transverse
(multivendor) compatibility on elementary cable sections, i.e. the
possibility of mixing various manufacturers' equipments within a
single optical section. However, the specifications in
Recommendation G.957 are also intended to be in accordance with
Recommendations G.955 and G.956 which provide the possibility to
achieve longitudinal compatibility for equipment of comparable
hierarchical level and application.
Recommendation G.957 is based on the use of one fibre per direction.
Any other optical arrangements may require different specifications
and are for further study.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword: UPI=ITU-5265; ASCII: UPI=ITU-2488).