25.2.2022
EN
X.E.III.101
Official Journal  of the European Unio
“Technology” for the “development”, “production” or “use” of equipment controlled
by X.A.III.101 or X.B.III.101, or “software” controlled by X.D.III.101, and other “technologies” as follows: a.
Specific “technologies” as follows: 1.
“Technology” for the processing and application of coatings to optical fibre specially designed to make it suitable for underwater use;
2.
“Technology” for the “development” of equipment employing “Synchronous Digital Hierarchy” (“SDH”) or “Synchronous Optical Network” (“SONET”) techniques.
Technical Note: For the purpose of X.E.III.101: 1)
“Synchronous digital hierarchy” (SDH) is a digital hierarchy providing a means to manage, multiplex, and access various forms of digital traffic using a synchronous transmission format on different types of media.
The format is based on the Synchronous Transport Module (STM) that is defined by CCITT Recommendation G.703, G.707, G.708, G.709 and others yet to be published.
The first level rate of “SDH” is 155,52 Mbits/s.
2)
“Synchronous optical network” (SONET) is a network providing a means to manage, multiplex and access various forms of digital traffic using a synchronous transmission format on fibre optics.
The format is the North America version of “SDH” and also uses the Synchronous Transport Module (STM).
However, it uses the Synchronous Transport Signal (STS) as the basic transport module with a first level rate of 51,81 Mbits/s.
The SONET standards are being integrated into those of “SDH”.
L 49/97