Fiber inspection software, how to inspect fiber optic lines

First, correct a misunderstanding. The relationship between optical fiber and broadband, broadband is a name for our way of surfing the Internet, and optical fiber is a medium used to transmit broadband network, because optical fiber transmission has the characteristics of long transmission distance, not afraid of interference, not afraid of stealing, etc., so it slowly replaces the past cable transmission (signal attenuation is large, the transmission distance is near, and it will be stolen). Therefore, in the future, don't say that you have installed 4M optical fiber, it should be said that you have installed 4M broadband transmitted by optical fiber, and the broadband transmitted by ordinary cable next to you is still installed.

Let's talk about what you think is a slow internet connection. There are many factors that contribute to slow end-user internet speeds, such as:1

Eliminate the problem) if it is still slow, the second step: connect the network cable from the optical modem network port directly to the computer, use Thunderbolt to link a better resource, if it can reach a speed of 600 1m s, it means that it is the problem of your router or the problem of other lines, anyway, it is your problem telecommunications, if it is still tens of k speeds is the problem of optical modems or telecom broadband, decisively find telecom to solve. If it's your problem, step 3:

Replace the router and set it up again, and check whether the network cable connectors used are shaky, rusty, or dirty.

I've taken a closer look here

More than 90% of the network speed is slow.

I'm not saying that telecommunications are good, but you have to check your computer first, and the data you test out like this doesn't make any sense

There is no software, you search for the speed test**, and then go to** to test.

Is there a soft route and is there a speed limit? Not really, right?

The main purpose of fiber inspection is to ensure the quality of the system connection, reduce the fault factors and find the fault point of the fiber when it fails. There are many detection methods, which are mainly divided into manual simple measurement and precision instrument measurement. Let's take a closer look:

Manual Simple Test of Optical Fiber Test Method:

This method is generally used to quickly detect the on-off of optical fibers and to distinguish the optical fibers made during construction. It is achieved by using a simple light source to inject visible light from one end of the optical fiber and observe which one emits light from the other end. Although this method is simple, it cannot quantitatively measure the attenuation of the fiber and the breakage of the fiber.

Fiber Optic Test Method Precision Instrument Test:

Quantitative measurement of optical fibers using an optical power meter or an optical time-domain reflectometry (OTDR) can measure the attenuation of the fiber, the attenuation of the connector, and even the location of the breakpoint of the fiber. This measurement can be used to quantitatively analyze the causes of fiber network failures and to evaluate fiber network products.

Fiber optic measurement with an OTDR can be broken down into three steps: parameterization, data acquisition, and curve analysis. Manually set measurement parameters include:

1) Wavelength selection ( ).

Because different wavelengths correspond to different light characteristics (including attenuation, microbending, etc.), the test wavelength generally follows the principle corresponding to the transmission and communication wavelength of the system, that is, if the system is open to 1550 wavelength, the test wavelength is 1550nm.

2) Pulse width:

The longer the pulse width, the larger the dynamic measurement range and the longer the measurement distance, but the dead zone in the OTDR curve waveform is larger. Short pulses inject light levels low, but reduce dead zones. The pulse duration period is usually expressed in ns.

3) Measuring range (range):

The OTDR measurement range refers to the maximum distance that the OTDR can obtain data for sampling, and the selection of this parameter determines the sampling resolution. The optimal measurement range is between the length of the fiber to be measured.

Due to the extremely weak backscattered light signal, the statistical averaging method is generally used to improve the signal-to-noise ratio, and the longer the averaging time, the higher the signal-to-noise ratio. For example, a 3-minute acquisition will be more dynamic than a 1-minute acquisition. However, the acquisition time of more than 10 minutes does not improve the signal-to-noise ratio very much.

Generally, the average time is not more than 3min.

5) Fiber Parameters:

The settings of the fiber parameters include the refractive index n and the backscatter coefficient n and the backscatter coefficient. The refractive index parameter is related to the distance measurement, and the backscatter coefficient affects the reflection and return loss measurements. These two parameters are usually given by optical fiber manufacturers.

After the parameters are set, the OTDR can send the optical pulse and receive the light reflected back by the scattering band of the fiber link, sample the output of the photodetector, obtain the OTDR curve, and analyze the curve to understand the fiber quality.

Method: Arrange two staff members, respectively at the two ends of the faulty optical fiber, one person brings a light pen, and the other section does not need to carry anything;

Ask the staff member on the other end if there is a red light as shown in the figure below. If red light appears, you can tell that the fiber is normal. If there is no red light, it can be judged that there is a break point in the middle of the optical fiber;

If there is no red light, you can also find out the breakpoint at night, when the light is dark, along the optical fiber to find that there is red light on the line.

Precautions: The daily maintenance of optical fiber is very important, it is the fundamental guarantee to ensure the safe, stable and reliable operation of optical fiber;

The technical data of each optical fiber should be measured once a year or half a year and compared with the original data. Analyze and discuss doubts as soon as possible when problems are found, and troubleshoot problems and troubleshooting as soon as possible to avoid sudden accidents;

Regularly inspect the optical cable line, and make detailed records of the cables, sheaths, cable joints, line sag and other problems found during the inspection, so as to facilitate the early detection and treatment of problems, which is a very important part of maintenance;

Regularly test the inlet optical power and outlet RF level of the optical receiver, and if it is found that there is a large difference from the original record, it should be analyzed whether the fault comes from the optical cable or the optical receiver, whether it is caused by the live connector or the optical transmitter itself.

There is a special equipment - red light pen.

Red light pen odtr light work is OK depending on your light measurement path or light decay.

It is mainly divided into manual simple measurement and precision instrument measurement.

1. Test indicators of optical fiber system.

The test of fiber optic lines requires only one result to be tested attenuation:

Attenuation<, (1300nm).

Attenuation <, (850nm).

2. Test items.

Connectivity test.

Full attenuation and SC connector attenuation test.

3. Specific test methods.

Multimode fiber horizontal subsystems require parameters at the test end;

Test the attenuation value at a wavelength of 850 nm or 1300 nm in one direction· Parameters to be tested for a multimode fiber backbone system;

The attenuation value is measured in one direction at wavelengths of 850 nm and 1300 nm.

At present, the most standard and authoritative testing institution in the country is Yuguan Testing. The Quality Supervision Bureau recognizes optical fiber testing, and the testing field involves multiple industries, optical fiber testing! It is the first testing unit in the province to obtain optical fiber testing.

Shenzhen Yuguan Testing is a professional third-party testing organization. We actively explore, innovate independently, check quality, be responsible for data, and maintain third-party publicity. And insist on providing test reports quickly and accurately.

Fiber Acceptance Test Method.

Fiber optic cables are divided into single-mode and multi-mode, and the tests are all the same. Generally, the test of optical cable is divided into: single and multi-mode discrimination test of optical cable.

Tested with a fusion splicer. Loss testing of fiber optic cables. Test with an optical power meter or OTDR.

Breakpoint testing of fiber optic cables. Use OTDR testing.

Single-mode fibers and multi-mode fibers are different, mainly because the difference in the geometric size of the fibers determines that they have different transmission light guides. In terms of application, the working wavelength of single-mode fiber is 1310nm, 1550nm, multi-mode is mainly used 850nm, 1300nm, generally when testing the attenuation of optical fiber, they will choose their corresponding working wavelength according to different fiber types, and their respective two windows are to be detected. The device that detects the attenuation and length of optical fibers is an OTDR.

While measuring the attenuation, the device will also have a representation of the entire transmission of the fiber under test, and can see the internal event points, such as the microbend or break point of the fiber.

Fiber speed test.

Fiber optic Internet access is technically the same as online Internet access. It's just that the medium used is different. Therefore, the speed measurement method is exactly the same as the speed measurement method of the **online network.

Many people think that optical fiber is faster than online networking. In fact, this is a misconception. No matter how you surf the Internet, bandwidth is measured in k, m and g.

Therefore, there is not much difference between the speed of 10M fiber and 10M ADSL. Just like your one-meter copper wire won't be longer than my one-meter iron wire, because the singular number is the same, and the value is the same. The possible difference is only from the reliability of the line, but the difference is small.