Digital Video Optical supply and installation environment

Digital Video Optical supply and installation environment

Generally the transmitter installation position to follow the front-end video capture device, the installation location are more dispersed, with a separate chassis to the power supply. Usually two ways: centralized power supply and local supply center field Optical transmission, front-end and back-end distance are far less centralized power supply in terms of security monitoring supply. Receiver are generally located in the engine room of the monitoring center, unlike the transmitter then dispersed uses the same chassis with the front-end transmitter power supply in the power supply, will occupy a lot of space of the engine room, appear disorganized, unable to unified management . Central receiver power supply can be used card-chassis powered, not slot full-studded, every few slots open space, conducive to the video Optical cooling. Optical laser assembly and photoelectric conversion module is very sensitive to instantaneous pulse current impact, and therefore should not be frequent switching machine. The front-end transmitter installed in the multi-front-end distribution box, dust and water do pay attention to the distribution box, plug in the power distribution box and more full order conducive Optical cooling is necessary to consider the fan distribution box. The engine room of the monitoring center to keep the environment clean and tidy, always pay attention to clean up Do not knot dust, best room decoration before the equipment into the room, in case the engine room renovation, should be promptly cleaned up. Generally have many devices centrally mounted in the cabinet, equipment heat, ventilation and in poor condition, it is best to install the air conditioning system to ensure the normal work of the Optical engine room. Protective measures to do the scene when installing video Optical, moisture-proof, water-proof, dust-proof, while paying attention to the actual operation of the site, must be equipped with the appropriate use of optical fiber, optical fiber can not use incomplete fault, if it does not match, it will seriously affect Optical transmission quality cable welding involved, should also pay attention to the measurement of optical attenuation of the fiber optic cable or loss in the range of valid values.2, Digital Video Optical Lightning

Digital Video Optical, particularly as a transmitter of the front-end equipment is usually installed in outdoor equipment box, on-site environment is quite harsh, mine is extremely important, the lightning protection measures directly determine the optical transceiver failure probability. The destruction of the way of the lightning is divided into direct lightning stroke, lightning and ground counterattack three forms, the most serious impact of Video Optical mainly to counter potential.

The so-called ground potential counterattack when the lightning rod air terminals will direct lightning stroke the powerful lightning current leaked into the earth after the deflectors and grounding, drop, grounding, as well as its associated metal objects will produce a very high generated a great potential difference between the instantaneous voltage, the high voltage will close to them but there is no direct contact with the metal object, cable and other electronic equipment, the potential difference caused by the shock is the ground potential counterattack. To counter potential damage to the following forms of Optical: when lightning stemming the flow into the earth, the ground potential of the ground network will be raised within a few microseconds to tens of thousands or hundreds of thousands of volts. Highly destructive of the lightning current flows from the ground portion of the various devices to these devices, the flow to other nearby equipment or by breakdown of the earth insulation (destruction of the schematic diagram of Figure 2), eventually leading to the destruction or damage of the device, the damaged part of the main : the enclosure power of PCB and electronic components, video interface chip and its associated electronic components, audio and data ports at the chip.

Lightning damage to a variety of forms, but still protective measures can take science to reduce Optical fault occurrence probability. First, to ensure that the grounding device to good effect is the premise of the lightning protection measures, because all the induced current is to last spilled into the earth. In general, the grounding resistance of the smaller discharge the better, usually the grounding resistance control is better than 4 ohms Grounding Clamp can be used to measure the grounding resistance. Can consider soil Zuji For some high soil resistivity place, thereby reducing grounding resistance. Second, the front-end equipment to the installation of surge protection, normal voltage, the surge protector in the high-impedance state, only a small leakage current, the power loss is small, when the line voltage, the surge protector was low resistance state, over-voltage discharge current flows through the surge protector earth overvoltage suppression down the line voltage is back to normal after the surge voltage, the surge protector has a high-impedance insulating state, therefore Surge protection must be co-ordinated with a good grounding device. The video signal output port and video output of the transmitter at the entrance of the front-end camera connected to a surge protector, if the transmitter is connected with some other data lines, the control signal the beginning of the line and an end to the installation of data SPD and the power input in camera and video Optical plus power mine and mine equipment. Make sure installed SPD SPD close to the access port, video port SPD distance, data port too far can not play lightning effect.

Plus a good lightning protection equipment, and the rest is ground grid design problem. Ground pile is absolutely necessary to put in place to ensure that the Digital Video Optical good ground, a good low impedance grounding grid design play a good effect in lightning protection equipment to ensure that the system can effectively balance the various parts of the voltage across the transmission system, to prevent the potential difference on line equipment interference, and also can effectively avoid the counter potential damage to the equipment.3, Digital Video Optical debugging

Well above points, it is necessary to start a normal debugging, and commissioning of optical fiber and data channel. Optical data more optional type, depending on the actual needs of the scene, Optical data type of the field are not the same, sure to refer to the corresponding manual debugging, in accordance with the instructions on the data the DIP and interfaces defined data wiring.

Some users due to the complexity of the environment, on-site installation of Video Optical in debug barrier case is usually first suspected product failure, in fact Optical technology has been very mature product, have been repeatedly tested and pager products before they leave the factory, so the product itself is unlikely that small, therefore, need to consider first scene is the installation problem, from the following aspects to troubleshoot:Optical fiber has not been tested, translucent or unstable optical path or optical attenuation is too large;· Front-end equipment failures, such as the camera is no video or no electricity;· Back-end equipment failures, such as monitors, video, keyboard control agreement does not itself can not control;· Connection line failure, such as video head no welding good barrier control lines are wrong, or pick the wrong cable cross, reverse, etc..

The above phenomenon especially line failure probability when problems need to be carefully checked. Troubleshooting, you can use the process of elimination, a device, a device to exclude last accurately determine the key. Recommended to determine whether the Optical transmitter and receiver together close test, should not pass, it is the failure of the Optical itself, you need to contact the manufacturer swapped. Order to reduce the problem, as far as possible before installation, close test Optical, thus quickly through the installation and commissioning, saving the construction period.4 Digital Video Optical routine maintenance

Video Optical work environment is usually a situation is quite bad, to maintain the cleanliness of the fiber head. Optical is very sensitive to dust, the Optical transport process in customer use for some time, are likely to appear at the fiber optic port of dirt and debris caused clogging, thus affecting the normal transmission of video and data, the use of industrial-free water alcohol and airlaid fiber head cleaning, avoid adhesion dust.

Digital Video Optical fiber jumpers inside with external optical fiber is connected via an adapter, the adapter is usually a ceramic casing, plug fiber head be especially cautioned not to place undue force to prevent the ceramic casing collapse crack or crushed, resulting in Optical unable to transmit signals.