The optical fiber transceiver can easily integrate the copper based cabling system into the optical fiber cabling system, which has strong flexibility and high cost performance. Usually, they can convert electrical signals into optical signals (and vice versa) to extend the transmission distance. Then, how to use optical fiber transceiver in the network and correctly connect it to switches, optical modules and other network equipment? This article will elaborate for you.
How to use optical transceiver?
Nowadays, optical fiber transceiver has been widely used in all walks of life, including security monitoring, enterprise network, campus LAN and so on. Optical fiber transceivers are small in size and occupy small space, so they are very suitable for deployment in distribution rooms, chassis and other places with limited space. Although the application environments of optical fiber transceivers are different, the connection methods are essentially the same. The common connection methods of optical fiber transceivers are described below.
Use alone:
Usually, optical fiber transceivers are used in pairs in the network, but sometimes they need to be used separately to connect copper cabling to optical fiber equipment. As shown in the figure below, the optical fiber transceiver with one SFP port and one RJ45 port is used to connect two Ethernet switches. The SFP port on the optical fiber transceiver is used to connect with the SFP port on switch a, and the RJ45 port is used to connect with the electrical port on switch B. the connection method is as follows:
1. Use UTP cable (network cable above CAT5) to connect the RJ45 port of switch B with the electrical port on the optical fiber transceiver.
2. Insert the SFP optical module into the SFP port on the optical transceiver, and then insert another SFP optical module into the SFP port of switch a.
3. Insert the optical fiber jumper into the SFP optical module on the optical fiber transceiver and switch a.
Use in pairs:
A pair of optical fiber transceivers is usually used to connect two copper based network devices together to extend the transmission distance. This is also a common scheme to use optical fiber transceiver in the network. The steps of how to use a pair of optical fiber transceivers with network switches, optical modules, optical fiber jumpers and copper cables are as follows:
1. Use UTP cable (network cable above CAT5) to connect the electrical port of switch a with RJ45 port of left optical transceiver.
2. Insert one SFP optical module into the SFP port of the left optical transceiver, and then insert the other SFP optical module into the SFP port of the right optical transceiver
3. Connect two optical transceivers using optical fiber jumpers.
4. Use UTP cable to connect RJ45 port of the right optical transceiver with the electrical port of switch B.
Note: most optical modules support hot plug, so there is no need to turn off the power of the optical transceiver when inserting the optical module into the corresponding port. However, it should be noted that when removing the optical module, you need to remove the optical fiber jumper first; Insert the fiber jumper after inserting the optical module into the fiber transceiver.
Precautions for using optical transceiver:
Fiber optic transceivers are plug and play devices. When connecting them with other network devices, some factors still need to be considered. It is best to choose a flat and safe location to deploy the optical fiber transceiver. It is also necessary to leave some space around the optical fiber transceiver for ventilation.
The wavelength of the optical module inserted into the optical fiber transceiver should be the same. That is, if the wavelength of the optical module on the optical transceiver at one end is 1310nm or 850nm, the wavelength of the optical module on the optical transceiver at the other end should also be consistent. At the same time, the speed of optical transceiver and optical module must be the same: gigabit optical module must be used with gigabit optical transceiver. In addition, the type of optical module on the optical fiber transceiver used in pairs should also be the same.
The jumper inserted into the optical fiber transceiver needs to match the port of the optical fiber transceiver. Generally, the SC optical fiber jumper is used to connect the optical fiber transceiver to the SC port, while the LC optical fiber jumper needs to be inserted into the SFP / SFP + port on the optical fiber transceiver.
It is necessary to confirm whether the optical transceiver supports full duplex or half duplex transmission. If the fiber-optic transceiver supporting full duplex is connected with the switch or hub supporting half duplex mode, it will lead to serious packet loss.
The operating temperature of the optical fiber transceiver needs to be kept within an appropriate range, otherwise the optical fiber transceiver will not work. The parameters of optical fiber transceivers from different suppliers may be different.
How to eliminate and solve the fault of optical fiber transceiver?
The use of optical fiber transceiver is very simple. If the optical fiber transceiver cannot work normally when applied to the network, it needs to be troubleshooting from the following six aspects:
1. The power indicator is not on, and the optical transceiver cannot communicate.
resolvent:
Verify that the power cord is connected to the power connector on the back of the optical transceiver.
Connect other equipment to the power outlet and check whether the power outlet is powered on.
Try using another power adapter of the same type that matches the fiber optic transceiver.
Check whether the voltage of the power supply is within the normal range.
2. The sys indicator on the optical transceiver is not on.
resolvent:
Generally, the sys indicator on the optical transceiver does not light up, indicating that the internal components on the equipment have been damaged or can not work normally. You can try restarting the device. If the power supply does not work, contact your supplier for assistance.
3. The sys indicator on the optical transceiver is flashing all the time.
resolvent:
An error occurred on this computer. You can try restarting the device. If it does not work, remove and reinstall the SFP optical module, or try replacing an SFP optical module. Or check whether the SFP optical module matches the optical transceiver.
4. The network between the RJ45 port on the optical transceiver and the terminal equipment is slow.
resolvent:
There may be a duplex mode mismatch between the port of the optical transceiver and the port of the terminal equipment. This happens when you use the RJ45 port of auto negotiation to connect to a device whose fixed duplex mode is full duplex. In this case, it is only necessary to adjust the duplex mode on the terminal equipment port and the optical transceiver port so that both ports use the same duplex mode.
5. The equipment connected to the optical transceiver has no communication.
resolvent:
The TX and Rx terminals of the optical fiber jumper are reversed, or the RJ45 port and are not connected to the correct port on the equipment (please pay attention to the connection method of straight through cable and cross cable).
6. On-off phenomenon
resolvent:
It may be that the optical path attenuation is too large. At this time, the optical power at the receiving end can be measured with an optical power meter. If it is near the receiving sensitivity range and within the range of 1-2db, it can be basically judged as an optical path fault.
It may be that the switch connected to the optical fiber transceiver fails. At this time, replace the switch with a PC, that is, two optical fiber transceivers are directly connected to the PC, and both ends are Ping. If there is no on-off phenomenon, it can be basically judged as a switch failure.
It may be the failure of the optical fiber transceiver. At this time, connect both ends of the optical fiber transceiver to the PC (do not pass through the switch). After the two ends have no problem with Ping, transfer a large file (100m) from one end to the other end, and observe its speed. If the speed is very slow (the file below 200m is transmitted for more than 15 minutes), it can be basically judged as the failure of the optical fiber transceiver.
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