With the application of the gradual deepening of domestic manufacturers are also beginning to self-developed Optical products appear makes the cost of the entire domestic products Optical dropped, this time, single-mode fiber and Optical gradually mature, so that the transmission distance farther, the better In more surveillance has been applied.
Optical installation
Optical scene to do the installation of protective measures, moisture-proof, waterproof, dustproof, bearing in mind the actual operating site, must be equipped with the appropriate use of fiber, optical fiber fault can not use incomplete, if not match, it will seriously affect the quality of Optical Transmission , when it comes to cable splicing and pay attention to the measurement of optical cable attenuation or loss in the range of valid values.
Optical debugging, mainly on the Fibre Channel and data debug. Since the optional type Optical data more, depending on the actual needs of the scene, Optical data types are not the same for field use, when debugging must refer to the relevant instructions, according to data DIP and interface definitions for instructions on data wiring.
Optical-site installation and complex environment, some users in the case of debugging nowhere usually first suspected a faulty product, in fact Optical technology has been very mature product, products factory have been repeatedly tested and pager, so are less likely to question the product itself Therefore, there is a problem at the scene first issue to consider is installed, you can go to troubleshoot from the following aspects:
· Fiber itself has not been tested, the optical path of light attenuation unreasonable or unstable or too large;
Front-end equipment failure, such as a video camera is no video or no electricity and the like;
· Back-end equipment failure, such as monitors without video, keyboard control protocol does not, by itself can not control;
• Connect line failure, such as video head no welding good barrier, control lines are wrong, or the wrong cable crossover, reverse and so on.
In particular, the above phenomenon is the probability of failure of the largest line in the face of issues need to be carefully examined. When troubleshooting, you can use a process of elimination, a device to exclude a device, and finally the key to accurately determine the problem. Users are recommended when there is a problem to determine whether Optical transmitter and receiver test close together, should not pass, for the Optical failure itself, you need to contact with the manufacturers swapped. To reduce the problem, the user as much as possible prior to installation, close the test Optical, so quickly through the installation and commissioning will be able to save period.
Lightning Optical Methods
Optical especially as the transmitter front-end device is usually mounted in the outdoor facilities box, the field environment is very bad, mine was extremely important to the merits of lightning protection measures directly determine the probability Optical failure. Failure mode is divided into lightning directly stroke lightning, lightning, and to counter potential three forms, the most affected in terms of Optical primarily ground counterattack.
The so-called counter potential is the lightning rod air terminals will direct lightning strikes when a strong lightning current leakage through the deflectors and grounding into the earth, the deflectors, grounding and metal objects connected to it will have a very high moment when generated between the voltage, the high voltage will close to them but there is no direct contact with metal objects, cables and other electronic equipment huge potential difference, the potential difference is caused by shock back ground. To counter potential damage caused by the form of Optical: When the lightning current into the earth, earth potential grounding grid will be raised to tens or hundreds of thousands of volts within a few microseconds. Highly destructive lightning current flows from the ground portion of a variety of devices these devices, or by breakdown earth insulation and flow to other nearby devices, eventually causing damage or damage to equipment, damage to the part are: cabinet power PCB board electronic components, video interface chip and related electronic components, audio and data ports of the chip.
While the destruction of a variety of forms of lightning, but still can take protective measures to reduce the scientific Optical failure probability. First, make sure grounding lightning protection measures is a prerequisite to good effect, because all induced currents are to be spilled into the final of the earth. In general, the smaller the discharge, the better grounding resistance, earth resistance usually at 4 ohms better, you can use ground clamp grounding resistance measurement. For some high soil resistivity areas, consider joining Zuji in the soil, thus reducing ground resistance. Secondly, the front-end equipment to install surge protectors, normal voltage, surge protectors high-impedance state, only a small leakage current, power loss is very small, when the lines in an overvoltage, the surge protector was low resistance state, over-voltage discharge current form into the earth by the surge protection, over-voltage is suppressed down after the surge, when the line voltage returns to normal, the surge protector and high-impedance insulated state, surge protection device must be properly grounded and match. Video input entrance front of the camera and the video signal output port connected to the transmitter surge protector, even if there are some additional data transmitter line, the control signal lines required starting end and the terminating end installation data mine, and also add power mine and other mine equipment in the power input of the camera and Optical. Make sure that the lightning arrester when installed close to the access port, if the mine from the video port, the data is not too far from the mouth to play lightning effect.
Plus lightning protection devices, the rest is ground network design problems. Ground pile in place is absolutely necessary to ensure good grounding Optical, a good low impedance ground network designed to ensure that the system of lightning protection equipment play a good effect and can effectively balance the various parts of the entire transmission system voltage, preventing the potential difference on line jamming equipment, but also can avoid to counter potential damage to the equipment.
Optical routine maintenance
Optical normal conditions working environment is very bad, when used to keep clean the fiber end. Optical very sensitive to dust, and since Optical clients during transport or after a period of time, are likely to occur in the fiber dust or debris clogging the mouth, thus affecting the normal transmission of video and data, then you can use industry-free water and alcohol wipes to clean the fiber head, to avoid dust adhesion.
Optical fiber jumpers inside and outside the fiber is connected via the adapter, the adapter is usually a ceramic die, pay special attention to the fiber in the plug head, not improper force against the ceramic sleeve seizing or crushed, resulting in Optical unable to properly transmit signals.