Ten Questions About Fiber Optic Media Converter

Fiber optic media converter are generally used in the network environment where Ethernet cables cannot cover and must use optical fibers to extend the transmission distance. They are usually located at the access layer of broadband metropolitan area networks, and are widely used in various monitoring and safety projects. It is inevitably encounter some problems in the process of using fiber optic media converters.
1. What kind of cable is used when the fiber optic media converter RJ45 port is connected to other equipment?
Reason: The converter RJ45 port is connected to the PC network card (DTE data terminal equipment) using cross-twisted pair, and to the HUB or SWITCH (DCE data communication equipment) parallel lines is used
2. What is the reason when TxLink light is off?
Reasons: a. Connect the wrong twisted pair; b. Poor contact between the twisted pair CAT connector and the device, or twisted pair quality problem; c. The device is not connected properly.
3. What is the reason why the TxLink light does not blink but stays on after the fiber is properly connected?
Reasons: a. The fault is usually caused by a long transmission distance; b. Compatibility with the network card (connected to the PC).
4. What is the reason why the Fxlink light is off?
Reasons: a. The fiber cable is connected incorrectly. The correct connection method is TX-RX, RX-TX or the fiber mode is wrong; b. The transmission distance is too long or the intermediate loss is too large, exceeding the nominal loss of this product. Solution : Take measures to reduce the intermediate loss or replace it with a longer transmission distance converter; c. The operating temperature of the fiber optic media converter is too high.
5. What is the reason why the Fxlink light does not blink but stays on after the fiber is properly connected?
Cause: This fault is generally caused by the transmission distance being too long or the intermediate loss being too large, exceeding the nominal loss of this product. The solution is to minimize the intermediate loss or replace it with a longer transmission distance transceiver.
6. What should I do if the five lights are all on or the indicator is normal but cannot be transmitted?
Normally, power off and restart to restore normal.
7. Does the ambient temperature has affection on the fiber optic media converter?
Generally the operating temperature of the optical fiber module can reach 70℃, The optical fiber module is greatly affected by the ambient temperature. Although it has a built-in automatic gain circuit, after the temperature exceeds a certain range, the optical power of the optical module is affected and reduced, thereby weakening the quality of the optical network signal and causing packet loss rises, even disconnecting the optical link.
8. Not compatible with the external device protocol?
Reason: 10/100M fiber optic media converter have the same frame length restrictions as 10/100M switches. Generally, they do not exceed 1522B or 1536B. When the switch connected at the central office supports some special protocols (such as Ciss’ ISL) The packet overhead is increased (Ciss ISL packet overhead is 30Bytes), which exceeds the frame upper limit length of the fiber converter and is discarded by it, result in the high packet loss or unsuccessful link. At this time, the terminal device MTU needs to be adjusted to the packet transmitted size of network device’s limit on the on the frame length. 1522 bytes of packets are added VLANtag.
9. After the chassis has been working for a period of time, some cards fail to work properly?
Reason: Early chassis power supply adopts relay mode. Insufficient power supply margin and large line loss are the main problems. After the chassis has been working for a period of time, some cards cannot work normally. When some cards are pulled out, the remaining cards work normally. After the chassis has been working for a long time, the connector oxidation causes a large connector loss. This power supply falls under requirement. The required range may cause the chassis card to be abnormal. the chassis power switch now is adopted with isolated and protected High-power Schottky diodes, connector form is improved. It reduces the power supply drop caused by the control circuit and the connector. At the same time, the power redundancy of the power supply is increased, which truly makes the backup power supply convenient and safe, and makes it more suitable for the requirements of long-term uninterrupted work.
10. Link alarm?
Reason: The transceiver has a link alarm function (linkloss). When a fiber is disconnected, it will automatically feed back to the electrical port (that is, the indicator on the electrical port will also go out). If the switch has network management, it will be reflected to the switch immediately