Itu-t rec. G. 957 (06/99) Optical interfaces for equipments and systems relating to the synchronous digital hierarchy

 
 
Recommendation G.957 (06/99) 
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ITU-T RECOMMENDATION G.957 
 
OPTICAL INTERFACES FOR EQUIPMENTS AND SYSTEMS 
RELATING TO THE SYNCHRONOUS DIGITAL HIERARCHY 
 
 
Summary 
This Recommendation specifies optical interface parameters for equipment and systems based on the 
Synchronous Digital Hierarchy to enable transverse compatibility. 
 
Source 
ITU-T Recommendation G.957 was revised by ITU-T Study Group 15 (1997-2000) and was 
approved under the WTSC Resolution No. 1 procedure on the 22nd of June 1999. 
 

 
Recommendation G.957 (06/99) 
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FOREWORD 
ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of 
telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of 
the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing 
Recommendations on them with a view to standardizing telecommunications on a worldwide basis. 
The World Telecommunication Standardization Conference (WTSC), which meets every four years, 
establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations 
on these topics. 
The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in 
WTSC Resolution No. 1. 
In some areas of information technology which fall within ITU-T’s purview, the necessary standards are 
prepared on a collaborative basis with ISO and IEC. 
NOTE 
In this Recommendation the term recognized operating agency (ROA) includes any individual, company, 
corporation or governmental organization that operates a public correspondence service. The terms 
Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). 
INTELLECTUAL PROPERTY RIGHTS
The ITU draws attention to the possibility that the practice or implementation of this Recommendation may 
involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, 
validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others 
outside of the Recommendation development process. 
As of the date of approval of this Recommendation, the ITU had received notice of intellectual property, 
protected by patents, which may be required to implement this Recommendation. However, implementors are 
cautioned that this may not represent the latest information and are therefore strongly urged to consult the 
TSB patent database. 

ITU 1999 
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, 
electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 

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