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How to buy the digital optical transceiver with the best price-performance ratio for the engineering company (Part 2)
3. The meaning of the indicator is clear
In order to facilitate project opening and project maintenance, multi-channel digital video optical transceivers should be marked with clear indicators. In addition to the power indicator, the transceiver of the digital video optical transceiver must have a video indicator, indicating whether the corresponding video channel has video signal input or output. Engineering personnel and users can be based on the project opening stage and project maintenance stage. The indication of the video indicator, to judge the situation in the opening and maintenance, locate the fault point, and solve possible problems as soon as possible.
Other audio and data, as well as Ethernet, E1, switch, etc .; a simple way is to refer to the practice of telecommunications equipment, provide synchronization indicator and loop indicator, engineering personnel and equipment manufacturers can determine that it is equipment system failure, Or part of the interface is faulty, so that the correct response can be made.
5. Reliability
As a security monitoring project, the reliability of the equipment should be the first consideration. The reliability of equipment is something that equipment manufacturers must consider during product design. However, some manufacturers may be unwilling to do or do not know how to do this work for some reasons. Here we focus on briefly discussing the following issues from an engineering perspective.
1. Convenient power supply, wide power supply range
Power supply is the primary consideration for ensuring the reliability of digital video optical transceivers. Power supply cannot be guaranteed to be reliable and reasonable. Talking about the reliability of digital video optical transceivers has become a problem. It is more convenient and reliable to use 220VAC-powered video optical transceivers. The 220VAC-powered optical transceivers should be selected as much as possible in the project. There are currently two main power supply methods for this optical transceiver, one is external power supply and the other is internal power supply, that is, the power supply and the optical transceiver are integrated. From the perspective of engineering applications, the built-in power supply is not only easy to install, but also has high reliability. At present, the switching power supply has two standard input ranges, one is 100-240VAC wide range power supply, which can adapt to the global power supply standard. One is that the standard of 220VAC ± 10% is generally used in China. This standard can meet the requirements. If the voltage fluctuation in the monitoring project is very unstable, there is no regulator. Then the former wide range power supply is more reliable.
The integrated power supply mode, the built-in power supply has its unique advantages in safety grounding and reliability. But there are also shortcomings, if the failure occurs the entire device must be returned to the factory for repair. The external power supply has its advantages in this regard. If it is a power failure, it can be easily purchased to replace the power supply. Especially for export products, the replaceability is also very important.
2. Strong adaptability to temperature and humidity
In some security monitoring projects, the working conditions of the optical transceiver are relatively harsh, the temperature variation range is wide, and the air humidity is large. Some field monitoring points will occasionally have a power outage, the optical transceiver will generate heat when it is working, and there will be condensed water droplets when the equipment cools down during the power outage. This requires that the digital video optical transceiver have more considerations in terms of temperature range and allowable humidity to ensure that it can work stably in harsh environments and meet the needs of security monitoring.
For environmental adaptability, generally experienced manufacturers will do some considerations in product design. Mainly from the aspect of temperature adaptability, the devices and power supply products of industrial machines are used. Special consideration should also be given to the addition of three anti-spray paints in the south during the rainy season to ensure the adaptability of the equipment in terms of humidity.
3. Grounding considerations
In security monitoring projects, ensuring good grounding of equipment is an important part of ensuring equipment reliability. Good grounding is good for the equipment to resist surge impact, electrical fast transient interference signals, anti-static and lightning strikes, and can significantly improve the reliability of the equipment. Therefore, when choosing an optical transceiver, special attention should be paid to the manufacturer's grounding scheme, which also shows the strength of the manufacturer. A good grounding should have the following considerations:
First, the power supply of the optical transceiver must be grounded. As an industrial-grade product, for the safety of equipment and personnel, the digital video optical transceiver should use the national standard 220VAC power cord to connect to the power socket, and can not use a two-core power cord to connect to the power socket for saving trouble. Moreover, the ground wire of the power socket should be reliably connected to the earth in the project.
Secondly, the signal ground of the optical transceiver should be connected to the chassis ground and the ground to provide a discharge circuit for the accumulation of static charge to prevent the accumulation of static charge and damage to the equipment. The good connection between the signal ground of the optical transceiver and the chassis ground and the ground can effectively prevent the damage caused by the induction lightning to the equipment.
Finally, the RS485 data terminal of the digital video optical transceiver should also provide a ground wire, so as to connect with the ground terminal of the opposite device in the project to avoid damage to the data port due to the difference in ground potential between the devices at both ends of the RS485 channel.
4. Port protection
The video port, audio port, and data port of the optical transceiver are extremely vulnerable to damage. Static electricity, surges, and induced lightning strikes may cause damage to the optical transceiver. In addition to careful operation in accordance with the construction requirements in the project, the equipment itself is also Necessary port protection should be provided. When selecting an optical transceiver, special attention should be paid to the port protection measures of the manufacturer.
In summary, when selecting equipment, the contractor and the user can consider the company's strength, technological advancement, and technical specifications, practicability, and reliability of the equipment, making more comparisons according to the aforementioned methods, and according to the actual project Make a suitable solution for your situation, and finally you can find a digital video optical transceiver that suits you and can guarantee the technical indicators and quality of the product.