The IEC 61300-3-35 standard focuses on observing and classifying debris, scratches, and defects during visual inspection of fiber end faces. It's crucial to inspect, clean, and reinspect fiber end faces before mating connectors — whether on patch cords and trunks within the network or on the test reference cord you connect to your tester. Contaminated fiber end faces can cause signal loss and reflections that degrade network. In the effort to guarantee a common level of performance from the connector, the International Electrotechnical Commission (IEC) created Standard 61300-3-35, which specifies pass/fail requirements for end face quality inspection before connection. Designed to be a common reference of product. Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-35: Examinations and measurements - Visual inspection of fibre optic connectors and fibre-stub transceivers IEC 61300-3-35:2022 is concerned with the observation and classification of debris. Unless otherwise specified, 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 either IEC or IEC's member National Committee in the country of the requester. If you. Fiber optic companies, engineers, technicians should understand the role that cleaning plays in the application at hand, and must learn the best methods of cleaning the end-face optical connectors. It's important to ensure that the proper connectors for the environment and application are chosen to. The industry standard process can be summarized as: Inspect, clean, inspect. If you see any contamination, you clean first, then inspect again.