Fiber optic telephone in the pipe gallery

Fiber optic telephone

The integrated pipe corridor is the integrated corridor of underground city pipelines. That is to construct a tunnel space underground in the city, integrating various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage, etc., with special inspection ports, lifting ports and monitoring systems, implementing unified planning and unified design. Unified construction and management is an important infrastructure and “lifeline” to ensure urban operations. It is a municipal public facility that implements unified planning, design, construction, and maintenance, and is built underground in the city for laying municipal public pipelines.

        With the progress of urbanization, more and more cities in China have begun to do underground integrated pipe corridor projects. Because the underground integrated pipe gallery is mostly built deeper and deeper than 4 to 5 meters above the surface, the role of safe fire protection and real-time monitoring in the underground pipe gallery is particularly important. In this case, a complete communication system is set up. It is very necessary. Moreover, according to the requirements of "Technical Specifications for GB 50838-2015 Urban Integrated Pipe Gallery Engineering" and "Technical Specifications for Monitoring and Alarming Systems for Urban Integrated Pipe Gallery (Consultation Draft)", it is clearly stated that a fixed communication system should be set up in the pipe gallery. The integrated pipe corridors under construction in China are basically fixed-line communication systems that use fiber-optic phones as pipe corridors. For the special environment of underground pipe corridors, choosing fiber-optic phones is indeed an inevitable trend, but in the face of many fiber-optic phone manufacturers, how to choose Is it a problem?

        The integrated pipe gallery is an emerging industry promoted by the State Council in 2015, and a comprehensive pipe gallery of about 850Km has been built nationwide in 15 years. By 2017, most of the main works of the pipe gallery built in 15 years have been basically completed, and it has entered. The installation of the corridor pipeline and the installation of the supporting electromechanical equipment, therefore, most of the manufacturers of fiber optic telephones do not have ready-made cases for the purchaser of the fiber optic telephone of the pipe gallery, even if the products of some manufacturers have been installed in the pipe gallery, because there is no use At the stage, it is not possible to determine the specific use effect, so there is not much reference value. How to choose fiber-optic phone without the guidance of ready-made cases will become a very headache for the purchaser, but the fiber-optic phone is not a new thing as a product. He has existed for decades. This product was originally used in highway tunnels and exists and used as an emergency telephone. Therefore, the user of the corridor chooses the fiber-optic phone. Although there is no direct use case of the pipe gallery, you can refer to the product. Relevant case usage.

So how to evaluate the merits of a fiber-optic phone should be investigated from the following points:

1. Safety - see the degree of protection

       The wet environment of the pipe gallery determines that the fiber optic telephone extension within the pipe gallery must have a very good seal. At present, the major design institutes basically require the protection level of the extension to be IP65 or above, but once the water inlet in the pipe gallery is completely scrapped. Imagine that after the pipe gallery is flooded, the various entrance units will send people to the gallery for emergency maintenance. At this time, how can a complete communication system help the entire repair work, and the communication with IP67 protection level? The equipment can keep the equipment working well even after water soaking. It can be seen that it is very important that the underground pipe corridor communication equipment has IP67 protection level. At the same time, the moisture in the pipe gallery and all kinds of microorganisms and other corrosive substances are widespread, and the corrosion of the equipment is very serious. The protection of the circuit board with high protection level will definitely protect the circuit inside the machine, and objectively will extend the use of the extension inside the pipe gallery. The role of life.

2. Anti-interference - look at the "all-fiber" access method

       The humid environment of the pipe gallery and the harmful gases such as biogas generated by it itself are seriously harmful to human life. To ensure the safety of the operation and maintenance personnel, various exhaust ventilation devices in the pipe gallery will be opened or opened frequently. The operation of the exhaust ventilation device (mainly the motor) generates very complicated electromagnetic interference, which inevitably interferes with the telephone signal of the corridor. At present, the only transmission method that can solve this interference is to use all-fiber access, but here we want to emphasize "all-fiber" - whether the extension or the auxiliary machine is all connected by fiber. At present, some of our manufacturers have proposed the concept of all-fiber access, but in fact, only the main road uses fiber-optic connection, and the sub-machine and the extension use cable connection. At this time, it is necessary to pay attention to the cable in the humid environment inside the pipe gallery. The attenuation is very serious, which will inevitably lead to a particularly high system failure rate, and the maintenance is complicated. It takes a few years for the cable to be replaced, which brings a huge workload. Since most of the owners of the pipe gallery are owners of the PPP model, most of the operation time is between 20 and 25 years. In the whole life cycle of the communication system, the maximum amount of maintenance will also bring considerable benefits to the owners. Profit margin.

3. Convenience of function - whether the incoming and outgoing calls are unblocked

The construction location of the pipe gallery determines that the mobile phone cannot be used here. The fiber optic phone in the pipe gallery is the only tool for external communication. It should be used as a communication guarantee system, which determines that the pipe corridor fiber phone cannot be equivalent. For other industrial telephones or emergency telephones, the corridor fiber-optic telephone not only needs to realize the free calls between the extensions and the center, but also freely communicate with the users of the external public network, not only to be able to fight independently, but also to Let the external public network phone freely come in, this will effectively provide the operation efficiency of the operation and maintenance personnel, and also play the role of communication security in special circumstances. One thing to note here is that some manufacturers use the edge ball. They only can implement the external call function for their products, but they don't mention how many phones can talk at the same time, that is, how many external lines can be connected to their system. Some of the corridors will have several or more than one entrance halls. Considering the special circumstances during the rescue and disaster relief, 1, 2 or 3 or 4 external lines are obviously not enough. Especially for some star-type connection schemes, the main unit and the auxiliary unit are completely a telephone. The function of the auxiliary machine is to extend the handset and the microphone and the dialing keyboard of the host, and the main and auxiliary machines apply a source. If the telephone is in a call, other calls can no longer be used, and the incoming call from the outside can only be answered on the host. The slave can't answer the call. These require the users of the gallery to pay close attention when purchasing.

4. System stability - whether the system can self-test and self-heal

Considering the large number of fiber optic telephones in the corridor, how to ensure its safety and stability, self-healing ring function and self-test function are especially important. This function will quickly eliminate faults in the event of a failure, avoiding system crashes, and facilitating the expansion of communication equipment after the extension of the pipe corridor. Here, by the way, the IP phone solution is the case. Most of the pipe corridors now belong to the test section pipe gallery. The length of the pipe gallery is relatively short, and the number of telephones is small. The IP phone is under the banner of the fiber-optic phone, and it can attract the advantage of price. The eyes of many purchasers can indeed meet the current use of the pipe gallery, but in the future, with the expansion of the pipe gallery, the expansion of the central equipment of the IP telephony solution and the complexity of the system as the number of phones increases System instability and high maintenance costs have disastrous consequences for the owner or operator of the pipe gallery. Finally, it is important to emphasize that the choice of fiber optic telephones is different according to the characteristics of different functional cabins in the corridor. In the gas compartment, explosion-proof fiber optic telephones must be selected, and they must be independent loops and cannot communicate with other compartments. This requirement is clearly defined in Article 5.4.7 of the national GB50838-2015 standard.

       The pipe corridor fiber optic phone has become an essential supporting equipment for the construction of the pipe gallery. However, the pipe-and-frame fiber-optic communication system that can truly achieve the above functions and guarantees is rare. Some bad manufacturers use the name of the fiber-optic phone. The actual use is still the original. IP phone or emergency industrial phone mode, so in the choice, we must have a clear understanding of the system, but also pay attention to whether it meets national standards.