With the rapid development of the domestic fiber access network construction, optical cable transfer boxes are used as an important wiring device for outdoor optical branching points and have been used more and more. Here, we should discuss the issues that should be paid attention to in the design and use of the optical cable transfer box from the aspects of box performance, sealing method, capacity problem, and the number of incoming cables.
one. Box performance
Since the cable transfer box is an outdoor device, the most fundamental requirement for it is to be able to withstand the drastic climate and harsh working environment. It must have the characteristics of waterproof condensation, waterproof and dustproof, pest and rodent damage, and strong resistance to impact damage. At present, there are mainly 3 types of optical fiber cable transfer box used in China: the original German KRONE box, the domestic reference KRONE box copy and the iron-based metal box. For the metal box, because of its poor performance in the condensation of water vapor, destined to not be used in large quantities, and gradually eliminated. KRONE box uses unsaturated polyester glass fiber reinforced material (SMC), lined with stencil, while some domestic products due to material performance problems lead to the box in the waterproof gas condensation and impact resistance of two properties and KRONE have a greater difference In addition, due to the poor anti-aging properties of the sealant strip, performance in both waterproof and dustproof performance is also general. Considering the performance-cost ratio comprehensively, it is more appropriate to choose the KRONE box.
two. Sealing method
The performance of the box meets the demands of the outdoor environment. The only way to erode the interior of the light transfer box is to enter the cable. Obviously, if the inlet seal is not good enough, a lot of moisture in the eight wells will directly flow into the cabinet, causing direct damage to the components inside the cabinet and even the optical passive components. Usually, engineering uses a method of mixed sealing with rosin plus paraffin wax (1:1). Of course, there is also the use of glass glue, plasticine or special synthetic sealing materials. However, no matter what material is used, it must have basic properties such as fast coagulation, insolubility in water, good temperature performance, and non-dry cracking.
three. capacity
In the actual design and engineering, people seem to only require the larger capacity of the optical cable transfer box, the better the capacity, but the possible consequences are: the volume of the cabinet increases, the equipment price increases. What should be the more reasonable situation?
The capacity of the cable transfer box should actually include three parts of the trunk cable direct (or direct-melt) capacity, trunk fiber distribution capacity, and branch cable capacity. Assume that the trunk cable is a 216-core ribbon cable (12 cores/belt). If there are 3 tapes at the branch point, then the capacity of the trunk cable is: 18-3=15 tapes, 180 cores; the capacity of the trunk fiber distribution area is 3+3=6 band, 72 cores; the capacity of the branch fiber optic cable distribution area is 1.5-2 times that of the main fiber optic cable with the capacity of 108-144 cores.
In fact, what we often refer to as the capacity of the transfer box should refer to its capacity for fiber distribution, which is the sum of the capacity of the trunk ray distribution fiber and the capacity of the packet ray distribution fiber. For this example, the capacity of this transfer box should be 180-216 cores.
As for the straight-through part of the trunk fiber optic cable, there are two main approaches in actual engineering: one is to cut the splice; the other is not to cut (commonly known as splice). For the former case, a special splice tray (or splice module/unit) needs to be installed in the cable transfer box. For the latter case, a direct through cable unit can be used to accommodate the straight-through optical cable, such as the cable through unit of Century Man Corporation. .
four. Number of incoming cables
In practice, people often ignore the issue of incoming cable reports. People are more concerned about the performance and capacity of the transfer box. However, since the optical cable transfer box is a long-term use equipment, with the continuous development of telecommunication operations, the continuous expansion of the line, the optical cable into the box will increase year by year. No one wants to see such a phenomenon: there is room for the capacity of the light transfer box, but they can no longer find the entrance hole and the cable fixing position.
Using the above example, suppose that each branch cable is 12 cores: 2 trunk cables (one in and one out); 9 to 12 branch cables. A total of 11-14 fiber optic cables. Of course, if the branch cable has a larger number of cores, the number of incoming cables will be relatively less. However, in practice, optical cable transfer boxes must at least ensure that more than 10 optical fiber cable inlets and optical cable fixed positions.
Of course, in addition to the above four core issues, there are still some issues that need to be addressed in the fiber optic cable transfer box, such as the issue of fiber management. This is not a detailed description.
I hope everyone has to help.
one. Box performance
Since the cable transfer box is an outdoor device, the most fundamental requirement for it is to be able to withstand the drastic climate and harsh working environment. It must have the characteristics of waterproof condensation, waterproof and dustproof, pest and rodent damage, and strong resistance to impact damage. At present, there are mainly 3 types of optical fiber cable transfer box used in China: the original German KRONE box, the domestic reference KRONE box copy and the iron-based metal box. For the metal box, because of its poor performance in the condensation of water vapor, destined to not be used in large quantities, and gradually eliminated. KRONE box uses unsaturated polyester glass fiber reinforced material (SMC), lined with stencil, while some domestic products due to material performance problems lead to the box in the waterproof gas condensation and impact resistance of two properties and KRONE have a greater difference In addition, due to the poor anti-aging properties of the sealant strip, performance in both waterproof and dustproof performance is also general. Considering the performance-cost ratio comprehensively, it is more appropriate to choose the KRONE box.
two. Sealing method
The performance of the box meets the demands of the outdoor environment. The only way to erode the interior of the light transfer box is to enter the cable. Obviously, if the inlet seal is not good enough, a lot of moisture in the eight wells will directly flow into the cabinet, causing direct damage to the components inside the cabinet and even the optical passive components. Usually, engineering uses a method of mixed sealing with rosin plus paraffin wax (1:1). Of course, there is also the use of glass glue, plasticine or special synthetic sealing materials. However, no matter what material is used, it must have basic properties such as fast coagulation, insolubility in water, good temperature performance, and non-dry cracking.
three. capacity
In the actual design and engineering, people seem to only require the larger capacity of the optical cable transfer box, the better the capacity, but the possible consequences are: the volume of the cabinet increases, the equipment price increases. What should be the more reasonable situation?
The capacity of the cable transfer box should actually include three parts of the trunk cable direct (or direct-melt) capacity, trunk fiber distribution capacity, and branch cable capacity. Assume that the trunk cable is a 216-core ribbon cable (12 cores/belt). If there are 3 tapes at the branch point, then the capacity of the trunk cable is: 18-3=15 tapes, 180 cores; the capacity of the trunk fiber distribution area is 3+3=6 band, 72 cores; the capacity of the branch fiber optic cable distribution area is 1.5-2 times that of the main fiber optic cable with the capacity of 108-144 cores.
In fact, what we often refer to as the capacity of the transfer box should refer to its capacity for fiber distribution, which is the sum of the capacity of the trunk ray distribution fiber and the capacity of the packet ray distribution fiber. For this example, the capacity of this transfer box should be 180-216 cores.
As for the straight-through part of the trunk fiber optic cable, there are two main approaches in actual engineering: one is to cut the splice; the other is not to cut (commonly known as splice). For the former case, a special splice tray (or splice module/unit) needs to be installed in the cable transfer box. For the latter case, a direct through cable unit can be used to accommodate the straight-through optical cable, such as the cable through unit of Century Man Corporation. .
four. Number of incoming cables
In practice, people often ignore the issue of incoming cable reports. People are more concerned about the performance and capacity of the transfer box. However, since the optical cable transfer box is a long-term use equipment, with the continuous development of telecommunication operations, the continuous expansion of the line, the optical cable into the box will increase year by year. No one wants to see such a phenomenon: there is room for the capacity of the light transfer box, but they can no longer find the entrance hole and the cable fixing position.
Using the above example, suppose that each branch cable is 12 cores: 2 trunk cables (one in and one out); 9 to 12 branch cables. A total of 11-14 fiber optic cables. Of course, if the branch cable has a larger number of cores, the number of incoming cables will be relatively less. However, in practice, optical cable transfer boxes must at least ensure that more than 10 optical fiber cable inlets and optical cable fixed positions.
Of course, in addition to the above four core issues, there are still some issues that need to be addressed in the fiber optic cable transfer box, such as the issue of fiber management. This is not a detailed description.
I hope everyone has to help.
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