IEC 61746 PDF

IEC provides procedures for calibrating multimode optical time domain reflectometers (OTDR). It covers OTDR measurement. Buy IEC CALIBRATION OF OPTICAL TIME-DOMAIN REFLECTOMETERS (OTDR) – PART 2: OTDR FOR MULTIMODE FIBRES from SAI Global. Buy IEC CALIBRATION OF OPTICAL TIME-DOMAIN REFLECTOMETERS (OTDR) – PART 1: OTDR FOR SINGLE MODE FIBRES from SAI Global.

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Have a long pigtail on the OTDR as a launch cable, long enough for the test pulse to settle, say 661746, then use a splice for a temporary connection. For a splice with 0. We recommend that you check the website of the publishers of the international document before making isc purchase. How can we differentiate a ghost from a real event? Subscription pricing is determined by: Are there some reusable connectors in the commerce? Your Alert Profile lists the documents that will be monitored.

There are many times a splice is undetectable in an OTDR trace due to good splices and the simple fact that the OTDR measurement technique itself is limited. From this trace, the OTDR calculates 6174 length, attenuation and joint loss. Please first log in with a verified email before subscribing to alerts. It is not considered a replacement for insertion loss testing by knowledgeable fiber optic personnel. This standard does not cover correction of the OTDR response.

IEC 61746-1 Ed. 1.0 en(2009)

Also a short connection cable attached to the OTDR before the launch cable that never gets removed from the OTDR prevents excess wear on the panel connector. If your network is short, the OTDR will not give you valid data. See the demonstration below for a way to prove this to yourself.

Need more than one copy? Results are archived with other documentation to be available if restoration is necessary uec the future. A ghost will not have any loss, it will be at equal distance from a highly reflective event look for repetitiontends to be in the middle of noise after the end of the cable. If the document is revised or amended, you will be notified by email.


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Proceed to Checkout Continue Shopping. Needless to say, it’s extremely important to understand how to use these instruments correctly.

It only covers OTDR measurement errors and uncertainties. In the real world, multimode cable plants in premises installations can have losses of dB or more. The differences in the measurement techniques used by OTDRs and a light source and power meter means that OTDR testing, especially on longer premises cable plants with higher loss, may not be comparable to measured insertion loss or the actual loss the communications system will experience.

From a more technical standpoint, the first and most important consideration for OTDR use is the length of the fibers to be tested. It sends a pulse down the fiber and looks for a return signal from fiber backscatter and reflections from joints, creating a display called a “trace” or “signature” from the measurement of the fiber.

Best to make sure the trace is not noisy to the end and have dB from the cable backscatter level to the noise floor. I changed the pulse width but nothing happened. Provides procedures for calibrating single-mode optical time domain reflectometers OTDR.

Calibration of fibre optic measurement instruments

For testing bare fiber, use a splice, not a connector. Follow these links to find other Standards similar to the one you are viewing. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

I am testing a cable with OTDR. This standard is also available to be included in Standards Subscriptions. Please first verify your email before subscribing to alerts.

Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Directional Results Can Be Confusing: Most OTDRs have a display range digitized to aboutparts, so on a 20km range, the display resolution is 1m, or on a 2km range it would be 0. The long recovery time from this overload pulse means the OTDR cannot make any useful measurements near the instrument itself.


The launch cable allows the OTDR trace to settle down after the test pulse is sent into the fiber so you can analyze the beginning of the cable you are testing. It is designed to cover every economic sector and virtually every activity of the humankind where technical standards may be used.

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Premises cabling, however, has short cable runs and almost never includes splices, so the requirement of OTDR testing appears to be as an alternative to insertion loss testing 16746 a light source and power meter, which in reality, is inappropriate. Some manufacturers of cable can provide that information for your testing. I 611746 bi directional analysis. It only covers OTDR measurement errors and uncertainties.

The launch cable has also been called a “pulse suppressor” because it allows time for the OTDR to settle down from this initial overload. A receive cable may be used on the far end to allow measurements of the connector on the end of the cable under test also.

An insertion loss test made with a light source and power meter is a simple test that is similar in principle to how a fiber optic link works. You are seeing the directional differences. Although we endeavour to maintain an up-to-date catalogue, on occasion we may not have the latest version of a document, including where it has not yet been provided through an international feed.

Splice threshold Reflectance threshold Slope threshold slope is attenuation coefficient End threshold depends on whether you 1 use receive reference cable which would be a normal connection loss or 2 the length of the cable and the noise floor of the measurement.