Smaller, faster, better - this is the trend over the years cable. With the invention of dispersion compensation technology and people to improve the reliability issues of concern fiber, "faster, better" is undoubtedly the 1990s advocated goal.
In recent years, the industry has been focusing on reducing the footprint of fiber optic networks. It can be said about 2005 with the fiber suppliers to develop small bending radius (RBR) fiber, the trend toward smaller cable and hardware development had begun to appear. These new optical waveguide design appear soon, people will develop international standards to regulate, namely ITU G657. Subsequently, the optical fiber is gradually increased due to the macro and micro-bending of the bending margin, so these can be "a knot" fibers start allows for smaller size cable design.
Macro and micro benefits of small bend radius of the fiber
Macro-bending phenomenon is a simple easy to understand. ITU G657 for macro-bending loss performance specification provides for a special light special bending radii. However, some saying that performance improved slightly curved main features from the small bending radii can achieve smaller, higher performance cabling. One method used to analyze the differences between actual macrobend and is slightly curved to imagine the single fiber wrapped around your finger, measure fiber loss (macrobend), according to a sandpaper on the fiber and measuring the corresponding loss (microbending loss), then the difference between the two.
In both cases, the fundamental optical phenomena lead to signal loss has a very big difference. When the cable is exposed to low-temperature environment, the cable in the material will tend to shrink, along a force is applied along the length of the fiber. This force will cause the inner cable fiber microbending. For example, slightly curved small margin improved bend radius of the fiber optic cable will undoubtedly help withstand large temperature changes.
Global cable manufacturers are using small bend radius of the fiber of this feature. Their "desire" is developed can be used the same as using copper cable - rugged, small, practical, anyone can easily operate, and will not damage the fiber. To achieve this, it is also the material used in the process of manufacturing an optical cable of the innovative. Small bend radius of the fiber bending performance has been improved, and promote new materials and new manufacturing techniques used in the manufacture of fiber optic cable, fiber optic cable so that smaller size and lighter weight. Together solve these problems, it can be produced smaller in size, greater flexibility of the new generation of optical cable.
A major factor in the small radius of the cable is plugged into the wiring and other direct connection cables. In addition to install more cables in the same space than the obvious benefits, the cable can also be smaller in size to accelerate the flow of air, since the cable duct occupies less space. With active electronic components suppliers try downsizing and consolidation of electronic enclosures, the importance of this advantage will be more obvious. In such electronic enclosures, the heat is becoming an important issue. Often, people will consider the airflow along the copper (copper itself will generate heat). But with the equipment cabinet becomes smaller, heat, various aspects of the air flow becomes very important.
Smaller direct-attached jumper cables and a new wave has been opened
Smaller, beyond your imagination
This phenomenon may not be so obvious now, but the circular diameter of the cable is reduced by one unit, the cable footprint (circular area) will be correspondingly reduced a lot. Therefore, the diameter of the cable could mean a slight decrease greatly reduced footprint. For example:
Thus, the typical 2.0-mm and a diameter of 1.2 mm cable cable compared it is clear that, although the cable diameter is not reduced by half, but in the same space (one square inch) within the optical cable can be installed by the number of recommended almost was 3 times!
For a more intuitive explanation to the cable bundle containing 24 jumpers example. We can see that both of the following differences:
1.2-mm and 2.0-mm cable bundle size comparison
In this figure, you can see an example of the cable 1.2-mm diameter, the fiber space occupied by the same number of much smaller. Similarly, even if the 1.6-mm diameter cable with a diameter of 1.2-mm cable comparison, the number of fiber optic cable can be installed in the same space, but also more than twice!
While more robust
We might ask the next question is about the smaller size of the cable length. In the latter part of the first decade of the 21st century, Telcordia for the widespread use of GR-409 directly connected to the cable released Revision 2 standard. Revision 2, including the name of the sub-category "small" cable, according to GR-409 standard allows a lower intensity of production of fiber optic cable. Revision 2 reduces the tensile strength of the so-called small package installation requirements, allowing the cable to withstand 9 pounds (40N) mounting load, instead of 22 pounds (100N) standard installation loads. At that time, it was widely believed to reduce the intensity of the production of smaller cable size required. With a rated load of 22 pounds of cable compared to the rated load is nine pounds of tensile cable installers need to be more careful to avoid damaging the cable.
However, some material is present in a small bending radius of the cable based on the cable actually used / design / method makes smaller cable size, beyond GR-409 set forth in the original 22 lbs tensile mounting load.
For example, 1.2-mm direct-attached cable is available now and can be installed to support 30 pounds of rated load. Compared with the 2.0-mm small rated cable, which means that new fiber optic cable having a diameter of 1.2-mm of its intensity is three times, and only take up one third of the space.
So, soon after, data center managers and other personnel will be able to install much smaller in size than the previous cable, but not passively select GR-409 small packages, so as not to reduce the strength of the cable. GR-409 cable should receive quotations to pay more attention to make sure you understand the purchase of the cable specifications. Many people do not understand this distinction.
Then you can ask any questions? If the size of the cable can be reduced, then the size of the hardware can be reduced. Look forward to in the near future, we can see more than ever with a smaller size of the hardware, so that you can achieve higher density, more compact cabling management, while ensuring the reliability of the network.