Itu-t rec. G. 957 (06/99) Optical interfaces for equipments and systems relating to the synchronous digital hierarchy
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Recommendation G.957 (06/99) 1 Recommendation G.957 OPTICAL INTERFACES FOR EQUIPMENTS AND SYSTEMS RELATING TO THE SYNCHRONOUS DIGITAL HIERARCHY (revised in 1999) 1 Scope This Recommendation covers optical interface parameter specifications for equipments and systems supporting the Synchronous Digital Hierarchy (SDH) defined in Recommendation G.707 and operating on single-mode optical fibres conforming to Recommendations G.652, G.653 and G.654. The purpose of this Recommendation is to provide specifications for the optical interfaces of SDH equipment, described in Recommendation G.783, 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 this Recommendation are also intended to be in accordance with Recommendation G.955 which provides the possibility to achieve longitudinal compatibility for equipment of comparable hierarchical level and application. This Recommendation is based on the use of one fibre per direction. Any other optical arrangements may require different specifications and are for further study. 2 References The following ITU-T Recommendations and other references contain provisions, which through reference in this text, constitute provisions of this Recommendation. At the time of the publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. – ITU-T Recommendation G.652 (1997), Characteristics of a single-mode optical fibre cable. – ITU-T Recommendation G.653 (1997), Characteristics of a dispersion shifted single-mode optical fibre cable. – ITU-T Recommendation G.654 (1997), Characteristics of a cut-off shifted single-mode optical fibre cable. – ITU-T Recommendation G.655 (1996), Characteristics of a non-zero dispersion shifted single-mode optical fibre cable. – ITU-T Recommendation G.707 (1996), Network node interface for the synchronous digital hierarchy. – ITU-T Recommendation G.783 (1997), Characteristics of Synchronous Digital Hierarchy (SDH) equipment functional blocks. – ITU-T Recommendation G.826 (1999), Error performance parameters and objectives for international, constant bit rate digital paths at or above the primary rate. – ITU-T Recommendation G.955 (1996), Digital line systems based on the 1544 kbit/s and the 2048 kbit/s hierarchy on optical fibre cables. |