How to deal with video optical transceiver operation failure
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Video optical transceivers have entered the Chinese market for more than 20 years. The earliest applications of video optical transceivers were mainly focused on industries with relatively good funding, such as *,*, government, and video services, as well as industries requiring higher transmission efficiency. Most of the earliest fiber-optic lines were multimode, and the transmission distance was generally only 2km. The transmission effect was poor and was easily affected by interference. With the popularization of single-mode optical fiber and optical transceiver technology, the transmission distance can be easily achieved by 30-40 km.
What are the treatment methods when the operation fails?
1, the optical path problem <br> <br> Optical security monitoring project, the majority of fiber optic cable laid by the users themselves, usually g652 single-mode fiber. Because the system coverage is generally not large, the optical link loss of the equipment with standard (≤20km) equipment is very rich. Therefore, the optical transceiver does not require excessive optical path loss, but users often encounter no image, image jitter, and image quality. Poor issues, when the majority of problems are at the fiber pigtails, jumpers or adapters at the ends of the optical path, and rarely with the trunk light path. Common problems include: 1. The fiber optic connector is inserted incorrectly; 2. The fiber optic connector core (ceramic tube) is contaminated. The solution is: 1. Re-insert the movable connector or replace the fiber jumper; 2. Wipe the plug with 99.9% absolute ethanol and plug the core; 3. Check the video cable of the camera with a multimeter to judge whether there is any video signal.
2, <br> <br> Optical data interface to meet the needs of the security monitoring system of various devices (matrix, hard recorder, decoder) provide a data interface rs-485 mode, the data interface of the advantages of this format is Long transmission distance, strong load capacity, and can form a four-wire full-duplex communication bus, any two devices on the line can achieve two-way communication, and four-wire rs-422 bus can only realize the bidirectional communication between master and slave. Communication, between slaves can not. Its disadvantage is that there is an enabler, in a three-state form, which brings instability to the communication and even "dead". If there is no communication (runaway), look for the cause from the following aspects:
Check if there is any control signal. Use a multimeter to communicate 10v controller (matrix, hard recorder, etc.) to output rs-485 to see if it has control signal output.
Judging whether the rs-485 interface of the optical transceiver is normal or not, if the ua-b voltage is zero, it is regarded as abnormal.
The pan/tilt can't be controlled and it can't be controlled. This phenomenon is caused by two reasons: a) rs-485 port a, b-reverse; b) The system impedance is seriously mismatched.
3. Optical switch <br> <br> switch signal is burst ttl level, it can control lights, alarms, relays, etc., load capacity switch interface to control the current magnitude of the measured , Such as ew series optical switch load capacity is ≤ 1.5a.
Ew series optical switch interface supports normally open buttons, but when the following diagram is connected, the normally open and normally closed modes all support:
Switch interfaces cannot be used directly in parallel, but can only be accessed through distribution circuits if required.
Some customers use rs-485 bus to transfer the switch. According to our practical experience, it is proved that this method is not desirable. It often occurs when the work is for a period of time (such as 3 to 4 days). Switching to rs-485 converter defects may be the problem.
4, hazards and countermeasures <br> <br> transient disturbances transient interference generated Optical: transient interference generated in large inductive loads, such as switching motors, transformers, relays and other equipment, as well as occurs during lightning Among them, it often invades the optical transceiver in an electrostatic induction manner.
The harm of transient interference: Because it interferes with high frequency, short duration, large interference amplitude (hundreds of thousands of volts), it can burn out the key parts of the rs-485 interface chip and main chip of the optical transceiver, without leaving any traces. Especially in the summer thunderstorm season, this destructive power has a great impact on users, businesses and manufacturers.
Countermeasures: Although optical transceiver manufacturers use various protection methods such as bypass method (self-healing diode), absorption method (bidirectional suppression diode, etc.) and isolation method (photocoupler isolation), they cannot completely eliminate transient interference. The damage, rs-485 interface damage is frequent, causing great pressure on users and manufacturers. 
Glossary:
Optical transceivers, as the name suggests, are terminal devices for optical signal transmission. Due to the current substantial price reduction of optical fiber and its wide range of applications in various fields, the use of optical transceivers is increasing, and manufacturers of optical transceivers have mushroomed. However, because some of these technologies are relatively mature when the optical transceiver market is still very small, the development of new technologies requires a lot of manpower and material resources. Therefore, most of the manufacturers of optical transceivers are mainly small and medium-sized enterprises. Various brands are emerging one after another, but the quality is very different.