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.

Author: Shakajin Samull
Country: Belgium
Language: English (Spanish)
Genre: Video
Published (Last): 21 November 2006
Pages: 331
PDF File Size: 4.50 Mb
ePub File Size: 12.52 Mb
ISBN: 888-1-77059-215-2
Downloads: 17420
Price: Free* [*Free Regsitration Required]
Uploader: Tazilkree

I assume you mean you need to test with a bare fiber on the OPGW. It constitutes a technical revision. If you shoot in both directions and overlay, the software should recognize that there should be events ief both directions, input a “0 dB” event and average accordingly.

If the document is revised or amended, you will be notified by email.

This standard is not included in 6174 packages. I use bi directional iwc. The actual resolution is determined by the width of the test pulse and the bandwidth of the OTDR receiver and is usually much longer than the display resolution. Provides procedures for calibrating single-mode optical time domain reflectometers OTDR. Please first verify your email before subscribing to alerts. The OTDR uses the speed of light in the fiber from the index of refraction to calculate the length of the fiber.

You are seeing the directional differences. This standard does not cover correction of the OTDR response.

The launch cable allows the OTDR trace to settle down after the ice pulse is sent into the fiber so you can analyze the beginning of the cable you are testing. From this trace, the OTDR calculates fiber length, attenuation and ied loss. 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.


IEC 61746-1 Ed. 1.0 en(2009)

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. We recommend that insertion loss testing be done even when OTDR testing is required 61764 installation contracts.

Some manufacturers of cable can provide that information for your testing. New international testing standards, however, accept both OTDR testing and insertion loss testing, even for short premises multimode cable plants.

How can we differentiate a ghost from a real event? You may delete a document from your Alert Profile at any time.

IEC | IEC Webstore | fibre optics

It is not considered a replacement for insertion loss testing by knowledgeable fiber optic personnel. You 16746 download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

The large event you see right in front of the instrument on the OTDR trace is caused by crosstalk within the instrument and reflectance from the connector on the face of isc OTDR. Directional Results Can Be Confusing: Results are archived with other documentation to be available if restoration is necessary in the future.

For this reason alone, we recommend that insertion loss testing be done even when OTDR testing is required by installation contracts. If you need help with the purchase or have any queries please email enquiries standards. Your Alert Profile lists the documents that will be monitored.

The answer to this question has several 6174.

The FOA Reference For Fiber Optics – OTDR FAQs

The launch cable has also been called a “pulse suppressor” because it allows time for the OTDR to settle down from this initial overload. It sends a pulse down the fiber and looks for a return signal from fiber backscatter and reflections from joints, 617446 a display called a “trace” or “signature” from the measurement of the fiber.

As the voice of the U. 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 your network is short, the OTDR will not give you valid data. From a more technical standpoint, the first and most important consideration for 6146 use is the length of the fibers to be tested.

Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Already Subscribed to this document.

BS EN 61746-1:2011

We have 6746 amendments or corrections for this standard. The launch cable, sometimes also called a “pulse suppressor,” has two major reasons for its use: It only covers OTDR measurement errors and uncertainties. We recommend that you check the website of the publishers of the ic document before making a purchase.

I have a limit 0. 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. Are there some reusable connectors in the commerce?

Return to the FOA home page. 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. OTDRs use an indirect measurement process, have poor length resolution and unique measurement errors that limit its accuracy in testing cable plants. Proceed to Checkout Continue Shopping.

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. This standard does not cover correction of the OTDR response.

For testing bare fiber, use a splice, not a connector.