The light brazing PON is not lit, but the LOS keeps flashing the red light, how to fix it

The PON light is the external connection status display light, the normal state should be solid, and the PON light on the fiber modem flashes to indicate that the fiber modem is trying to establish a connection.

If the PON light flashes or does not light up, it is generally a line fault, it is recommended to check the indoor line first, to see if there is a situation where the bending angle of the line is too large, if so, it is recommended to restore the line first, and then see if it can be connected to the Internet, if it is still unable to access the Internet, it is recommended to contact the manual customer service of the home place to report the fault processing.

If the LOS light turns red or flashes, it is usually caused by the following conditions:

If there is a problem with the optical interface of the optical modem, you need to replace the optical modem.

The indoor pigtail connection optical modem connector is loose, and the connector can be restored by plugging it in;

The bend of the optical fiber in the indoor part is too large. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, as long as the optical fiber is straightened;

If the outdoor optical fiber is broken or the optical port of the equipment in the equipment room is faulty, you need to contact the staff to report the fault.

The flashing of light signal lights mainly has the following aspects:

1. The light port of the computer room emits low or no light, causing the user's optical modem to work abnormally, and the optical signal light cannot receive the optical signal sent from the optical cable or the power of the optical signal is too low, which will cause the optical modem to shake hands with the computer room abnormally, and the optical signal will flash or alarm with a red light.

2. Optical cable failure (including broken optical splitter) will also cause the optical modem to not receive light or the light collection is too low, and the optical signal light will also flash or alarm with red light.

3. The failure of the optical modem itself and the partial damage of the receiver will also cause this phenomenon.

No matter which of the above three conditions occurs, users basically cannot eliminate the fault by themselves, and can only report the fault through the operator's maintenance personnel.

PON flashing indicates that the fiber is normally connected to the fiber modem.

If the LOS red light is on, it means that the fiber optic modem is not accepting the fiber normally.

1. PON flashing green means that the optical fiber and the modem can be connected normally, and it doesn't matter if you can't connect to the network and the connection status. It has to do with LOS lights.

2. The LOS red light may be a problem with the optical interface of the cat and needs to be replaced.

3. The indoor pigtail connection optical cat connector is loose. Plug the connector in and it can be restored.

4. The operator may be maintaining the cell network, call ** to ask the operator.

Introduction: Optical modem, also known as single-port optical transceiver, is a three-piece optical fiber transmission equipment developed for special user environments. The device adopts a large-scale integrated chip, simple circuit, low power consumption, high reliability, complete alarm status indication and perfect network management function.

An optical modem consists of transmitting, receiving, controlling, interface, and power supply. The data terminal equipment provides the transmitted data in the form of binary serial signal, converts it into an internal logic level through the interface and sends it to the sending part of the imitation attitude, and sends it to the line through the modulation circuit backup section of the offset to make the signal required by the line. The receiving part receives the signal from the line of the combustion shed, which is restored into a digital signal and sent to the digital terminal equipment after filtering, anti-modulation and level conversion.

In the above situation, if the red light will be on, consider that the optical fiber fusion at the joint is unqualified or broken, or the cold joint at the macro dry splitter box is not plugged in well or the cold rolling joint is broken, etc., check whether the reason is here.

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In this case, the optical signal is interrupted, and the causes and solutions are as follows:

1. If there is a problem with the optical interface of the optical modem, this situation is a hardware problem of the optical modem, and the only way to repair the optical modem is to send the optical modem to customer service or replace it with a new optical modem.

Second, the indoor pigtail connection optical modem connector is loose or the contact is poor, in this case, you need to dial down the interface to clean it and then plug it back in.

3. The bending of the indoor part of the optical fiber is too large. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, as long as the optical fiber is straightened;

Fourth, broadband arrears: Broadband services are basically postpaid models, and operators will close broadband services due to customer service arrears for too long, in which case only need to pay off the arrears.

Fifth, the regional broadband failure, may be the entire area of broadband is being repaired or the fault is being repaired, in this case, you can call customer service ** to understand the situation, waiting for the maintenance personnel to repair the broadband.

If the light cannot be received at the modem or the light is too low, the light signal light will flash or the red light will always be on to alarm.

There is a square pigtail head plugged into the light cat, which is usually blue. You can check if the head is plugged in, and you can check the fiber optic cable attached to the head to see if the cable is broken, damaged, bent or knotted as far as you can see.

If the above situation can be ruled out, it is a good file operator optical cable failure, the user is unable to repair it by himself, can only call the fault acceptance ** to report the fault, and wait for the operator's maintenance staff to deal with it.

PON (passive optical network) means that there are no electronic devices and electronic power supplies (in the optical distribution network), and ODN is composed of passive components such as optical splitters, and does not require expensive active electronic equipment. A passive optical network consists of an optical line terminal (OLT) installed at the central control station, and a number of supporting optical network line lead units (ONUS) installed at the user site. The optical distribution network (ODN) between the OLT and the ONU consists of optical fibers and passive splitters or couplers.

LOS as a synchronization signal, loss of alarm signal. Loss of Sync signal indication (open-drain output), when a sync pulse is detected, LOS is high impedance; If no synchronization signal is found during the LOS detection time, the LOS is pulled low. Once a sync pulse is detected and the duration is greater than the LOS release time, the LOS is set high.

Connect a 1K pull-up resistor between the LOS and VCC.

Explanation of terms. It can realize two-way transparent transmission of data between optical fiber and RS-232 485 422 serial port. Due to the long transmission distance of optical fiber (multi-mode 2km, single-mode up to 20, 40, 60km), strong anti-interference ability, it is the best choice for long-distance transmission connecting remote terminal units to the host and decentralized centralized control system, because optical fiber has a strong anti-interference ability, it can effectively avoid lightning strikes, surges and electromagnetic interference and other damage to industrial data communication equipment and interference of communication lines, and ensure the stability of communication systems.

Product features: support point-to-point and ring (point-to-multipoint) connection support RS-232 485 422 interface, support RS-232485 422 multiple asynchronous communication protocols, support two-wire half-duplex (RS-485) four-wire full-duplex communication mode (RS-422) optical fiber interface ST, SC, FC optional (need to be customized), optical fiber communication distance multi-mode 2km, single-mode up to 20km, 40km, 60kmThe data communication rate can reach up to 120kbps

It could be due to poor fiber contact or damaged lines.

Here's how to fix it:

1.The normal state of the optical modem indicator should be that the power light is always on; The PON light is always on; The LOS light does not turn on; The LAN port corresponds to the interface plugged into the network cable, and the indicator light is always on or flashing, otherwise an exception will occur.

If the red light flashes and the optical modem PON light does not turn on, you should check and adjust the optical fiber plug behind the optical modem first.

3.Check whether the optical fiber is connected accurately, whether the interface is in poor contact or loose, you can wipe it with alcohol and then plug it back in.

4.Then check the fiber optic cable for any breakage.

5.If it still can't be solved, you can only contact the maintenance personnel of the company where the network fee is paid to check, repair or rewire.

LOS light signal indicator, red light flashing: indicates that the device has not received the light signal.

Suggestions: 1. Restart the optical modem;

2. Check whether the bending angle of the line is too large;

3. Check whether the optical fiber interface is loose and plug in the joint;

If the above methods still do not solve the problem, you can call the local 10086 to report the broadband fault.

What should I do if the LOS red light flashes and the PON light does not light up?

If the LOS light on the optical modem turns red or flashes, it is generally faulty, as follows:

1. There is a problem with the optical interface of the optical modem, and the optical modem needs to be replaced.

2. The indoor pigtail connection optical cat connector is loose, and the connector can be restored by plugging it in;

3. The bending of the indoor part of the optical fiber is too large. Excessive bending of the optical fiber will affect the total reflection transmission of the optical signal in the optical fiber, as long as the optical fiber is straightened;

4. If the optical fiber of the outdoor part is broken or the optical port of the equipment in the computer room is faulty, it is necessary to report the broadband fault, and there will be staff to come to the door to troubleshoot the fault after the fault report.

If the cat is on the Internet, it will turn on a red light, which means that the fiber optic cat cannot receive the signal, so it cannot access the Internet. The general reasons are:

1. The optical fiber fusion at the joint is unqualified or broken;

2. The cold connector at the splitter box is not plugged in well or the cold connector is broken;

3. The connector at the optical box is not plugged in;

4. Somewhere in the line is damaged or broken, etc.

In general, users with this kind of failure cannot repair it by themselves, and they need specialized personnel and fiber optic tools, so it is recommended to call the network operator to report the repair.

The optical signal indicator of the optical modem LOS flashes red, indicating that the device has not received the optical signal.

Suggestions: 1. Restart the optical modem;

2. Check whether the bending angle of the line is too large and the phenomenon of extrusion;

3. Check whether the optical fiber interface is loose and plug in the joint;

If the above methods still do not solve the problem, you can call the customer service of the local operator to report the broadband fault.

If the LOS light flashes red, it is preliminarily judged that the modem cannot receive the light signal or is too weak, you can follow the steps below to check further:

1. Please check whether the connection between the yellow pigtail and the optical cat is loose;

2. If there is any looseness, please reconnect it manually and restart the modem;

3. If the "LOS" light indicator continues to flash, please report the fault.