The function of OTDR
An OTDR (Optical Time Domain Reflectometer) is used in fiber optics to measure the time and intensity of the light reflected on an optical fiber.
An OTDR can detect such light loss and pinpoint trouble areas, making repairs easy. The more quickly trouble areas are identified and addressed, the less your fiber optic network will suffer from data transfer problems. More to the point, it is used as a troubleshooting device to find faults, splices, and bends in fiber optic cables, with an eye toward identifying light loss. Light loss is especially important in fiber optic cables because it can interfere with the transmission of data.
The OTDR is not perfect, of course. Critics charge that it can produce inaccurate results if two trouble spots are very close together or if the pulse has a long travel length. Experts also urge training in order to interpret the data correctly. Another factor is the relatively high price for a device that might be used only sparingly.
Proponents, however, counter that being able to pinpoint and address light loss points is well worth the price, both for the OTDR device and for the training needed to operate and properly understand the data that that OTDR records.
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The difference between indoor cables and outside cables . Generally, outside cables are designed to resist water penetration by using a gell fill or dry water-blocking compounds and a polyethylene jacket. The new dry cables are getting very popular, since they can be made as distribution types which are easier to terminate. Many also have a PE jacket over a UL-rated PVC jacket so you can bring the cable into the building, strip off the outside jacket and run it anywhere in the building (not the 50 feet limit of PE.) Indoor or premises cable must be rated for flame retardance for safety and to meet code.
The quotation the of exclusive 10Mbps fiber optic to the home in China . We must talk about optical fiber access first when we discuss FTTH. Optical fiber access refers to using optical fiber as a transmission media between the terminal and the user. Optical fiber access can be divided into active optical access and passive optical access. The main technology of optical fiber subscriber networks is optical-wave transmission technology. It can be divided into FTTC, FTTZ, FTTO, FTTF, FTTH, etc according to the degree of users. There are lots of operators can be chosen in China, such as Telecom, Topway, Netcom, the Great Wall and China Tietong. They offer a slightly different