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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If the document is revised or amended, you will be notified by email. Add to Alert PDF. We are starting to test some OPGW cables. First, what are the sources of error? See the demonstration below for a way to prove this to yourself.

A light is placed on one end of the cable and a power meter measures loss at the other end, just like a link transmitter and receiver use the fiber for communications.

It only covers OTDR measurement errors and uncertainties.

IEC 61746-2:2010

Please first log in with a verified email before subscribing to alerts. International Classification for Standards ICS is an international classification system for technical standards. For a splice with 0. The answer to this question has several aspects. Later OTDR testing may be used for troubleshooting problems like finding locations of cable breaks caused by dig-ups.

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IEC Ed. b – Calibration of optical time-domain reflectometers (OTDR)

Best to make sure the trace is not noisy to the end and have dB from the cable backscatter level to the noise floor. Needless to say, it’s extremely important to understand how to use these instruments correctly. Splice threshold Ieec threshold Slope threshold slope is attenuation coefficient End threshold depends on whether you 1 use receive reference 16746 which would be a normal connection loss or 2 the length of the cable and the noise floor of the measurement. I have a limit 0.

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In the real world, multimode cable plants in premises installations can have losses of dB or more. OTDRs use an indirect measurement process, have poor length resolution and unique measurement errors that limit its accuracy in testing cable plants.

Return to the FOA home page. 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.

Directional Results Can Be Confusing: I changed the pulse width but nothing happened. We recommend that insertion loss testing be done even when OTDR testing is required by installation contracts. Kec can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. The actual resolution 6746 determined by the width of the test pulse and the bandwidth of the OTDR receiver and is usually much longer than the display resolution.

Just measure the fiber on the spool of cable with the OTDR, then look at the cable jacket for length markings to get the actual length of the cable from the printed markings at each end of the cable. You can fusion splice the fibers then cut the splice out or use a removable splice like the Corning Camsplice http: We have no amendments or corrections for this standard.

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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. You are seeing the directional differences. Results are archived with other documentation to be available if restoration is necessary in the future.

Please first verify your email before subscribing to alerts. Already Subscribed to this document. For testing bare fiber, use a splice, not a connector. 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.

I assume you mean you need to test with a bare fiber on the OPGW. 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.

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Are there some reusable connectors in the commerce?

If you shoot in both directions and overlay, the software should recognize that there should be events in both directions, input a “0 dB” event and average accordingly.

You may delete a document from your Alert Profile at any time. OTDRs are always used with a launch cable and may use a receive cable. It is designed to cover every economic sector and virtually every activity of oec humankind where technical standards may be used.

IEC 61746-1 Ed. 1.0 en(2009)

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 6176 be 0. This standard is not included in any packages. From a more technical standpoint, the first and most important consideration for OTDR use is the length of the fibers to be tested.

Follow these links to find other Standards similar to the one you are viewing. 6174 launch cable has also been called a “pulse suppressor” because it allows time for the OTDR to settle down from this initial overload.

Have a long pigtail on the OTDR as a launch cable, long enough for the test pulse to settle, say m, then use a splice for a temporary connection. I am testing a cable with OTDR. An insertion loss test made with a light source and power meter is a simple test that is similar 617746 principle to how a fiber optic link works.

In a long outside plant cable with many splices, the OTDR is used to jec that the cable has not been damaged during installation and each splice is properly made.

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