Fiber optic cabling problems

1, the multi-mode or single-mode? What is the difference?

In general, the transmission distance of optical fiber user requirements is short, such as several hundred meters, a multimode fiber transmission distance can be, but if there are thousands of meters or more, without using signalrelay case must be used in single mode fiber.

The 2, 4 core, 6 core, 8 core or more cores?

Optical fiber to complete the transfer task, must have at least one of a hair two core. In fact, a fiber 4, 6, 8 or morecores on the market, the excess core can be used as a backup, also can do the transmission channel more.

3, is the use of hanging box or frame type optical fiber distribution frame?

Wall hanging box is generally used in optical fiber network inside a small, such as a 4 core fiber, but if the fibernumber more, rack frame shows its advantage to the routers and switches, which can be placed in the same cabinet,convenient centralized management and safety.

4, FC, SC, ST, LC, MTRJ are what kind of interface, which one?

These are not the same interface is used in different environment, there is no uniform standard, the difference is mainly reflected in the connection method and the shape is like a screw, tightening or directly on the card? Is square or round? Is big or small (big compared to take place, small mouth can have greater port density)? Is composed oftwo heads or separate? Users do not have to be too concerned about the specific interface, it is necessary to pay attention to if the expansion in optical fiber system old existing circumstances, they must match each other.

5, 100Mbps or 100Mbps?

The general optical fiber can be used not only for 100BASE-FX, but also can be used for 1000BASE-LX/SX, but different fiber will have different maximum transmission distance. There are three factors: multi-mode or single-mode? What are the working wavelength? How much is the diameter of the optical fiber?)

Note: Gigabit Ethernet standard (IEEE802.3z) which defines two optical fiber transmission standards: 1000BASE-SX only supports the multimode fiber, can be used for multimode fiber diameter of 62.5um or 50um, wavelength was 770-860nm, the transmission distance is 220-550m. 1000BASE-LX can be used for multimode fiber diameter of62.5um or 50um, the wavelength range of 1270-1355nm, the transmission distance is 550m. Can also support thediameter of single mode fiber 9um or 10um, the wavelength range of 1270-1355nm, the transmission distance is about 5km

6, the fiber is how to access switch?

Generally there are two ways, one is through the optical fiber jumper access switch integrated or inserted into theoptical fiber module, two is through the optical fiber transceiver, the optical fiber access transceiver interface, then the ordinary twisted pair line access switch RJ45 port can be.

7, is the central beam tube type or cengjiaoshi?

As the name suggests, the central part of the fiber core tube fiber optic cable center beam placed in the cable, manycore into a tube shape, and the outer layer of two steel wire cable placed in parallel, to ensure that the tensile strength of the optical cable.

Layer stranded optical center part to strengthen setting core, optical fiber cable core surrounded by the coreperiphery, many core combined to form a layer of a layer shape.

In addition to manufacturing process, both in the application of performance differences are quite obvious. Tensilewaterproof layer stranded cable than the central beam tube type, in the capacity of core number, cengjiaoshi canaccommodate dozens to hundreds of core core, while the center beam tube type can hold a maximum of a few core.Layer stranded cable can be used in outdoor environment complex, including direct overhead pipeline under wateretc..

To the user, if the number of the fiber core requirements for cable less, such as 4, 6, 8 core, and the installationenvironment is relatively common, in the budget is not sufficient conditions can be considered the central beam tube type, but if the wiring engineering environment is relatively poor, the fiber core number is large, it is best to use layer stranded.

8, how to identify the optical fiber cable is multi-mode or single-mode?

First is a relatively simple method, for indoor optical fiber, can be identified through the single-mode fiber and multimode fiber external color, single mode optical fiber / cable is yellow, and multimode is red. Includes fiber jumperand pigtail is recognition method.

For outdoor optical fiber / cable, generally can be identified through the code, there is a string of characters in thecable sheath, such as GYXTW-4-A1a, the last paragraph beginning with A represents is multimode fiber, beginning with B represents is a multimode optical fiber, a little more detail, multimode fiber 50/ 125 specifications of A1arepresentative, multimode optical fiber 62.5/125 specification A1b, B1.1 represents the non dispersion shifted single-mode optical fiber etc..

If this does not recognize a single-mode fiber and multimode fiber, it is only through special equipment to identify, asoptical fiber fusion splicer, it will automatically identify the single mode or multimode is, single mode will show SM,multimode displaying MM

Of course, on the other hand, multimode fiber core diameter is 50 μ m or 62.5 μ m, and single mode fiber is only 8.3μ m, from the perspective of this difference is relatively large, but the naked eye recognition up or has the certain difficulty. Note: m is micro code, 1 μ M = 1 / 1000

上一篇：CES 2014上发布的电视调研报告结果
下一篇：The challenge of IPTV digital CATV cable will be the lead? T