Network transmission connections

This section is connected to you about the network transmission mode (hereinafter is part)
1 cable:
First, the cable sheath and an optical fiber is composed of a

generally 16/24/32 core (cores more weldable pigtail the more, the more the number of cores may be connected more representatives device)
2. splice closure:
because of the limited length of a single cable, if the length is not long enough so that when we need to use a splice closure, is generally in the connecting box after sealed with a fiber splice, the following is the splice closure of two kinds:
this splice closure is typically fused fiber crude
such boxes are generally welded splice fine fiber
3. the splice machine:
the above we said fusing fibers is the need to use specialized equipment, I took for everyone to talk about the device:
the figure we see this is a machine Splice
Here we have an enterprise which will be used in portable fiber fusion machine, for example:

the figure black box is flanged box (also called splice boxes), the rear portion of a thin black cable access, will be welded to the skin after peeling ××× pigtail, and then use the device is connected to the head flange .
4. Common pigtail type:
Usually, they are generous head SC and LC first two small square


of course, there are other models pigtail we are now relatively rare, here we only need a simple understanding can be a

5-jump fiber:
general common combination of our optical fiber jumper SC-FC, and the optical fiber jumper to be connected when the need to use different devices, connected to a splice tray, a connection device

type and resolution mode pigtail 6. ( generally divided into single-mode and multimode):


① transmitting means generating optical signals is not the same: the laser is a single mode, multimode signal emitted by the LED light emitting diodes
of different diameter of the core and material ②: singlemode thin diameter, having a large diameter multimode
Different standard production process ③: a high standard single-mode process, the low standard multimode process
④ can be simply determined by the color and thickness of a single mode or multimode optical fiber: From the above FIG line orange multimode, single-mode line ×× ×
⑤ accurately determined by identifying the: multimode identified as MM (multi mode), identified as a single mode SM (Single mode)
7. the photoelectric conversion device (as shown below):
an optical signal and an electric signal system conversion machine ( used for enterprise network or campus)

8. the optical module:
① old GBIC optical modules (large)

② mainstream SFP optical module (small)

bandwidth of the optical module: generally 1G, 10G, is also distinguished by the size of the optical module.
9.PON device (as shown below):

different from the normal light different modules: Common module requires two fibers, a close, a hair; PON and the optical wave device can be adjusted so as to achieve a wavelength of the fiber to achieve a transceiver, such a device used for a cell, the number of ports can be connected to many users on the device.
10. The splitter:

11.OLT apparatus (uplink device splitter):

12. Next we look at the light characters on behalf of what modules are:

Type: the SFP
Bandwidth: 1.25Gb / s
transmission distance: 15km
transceiver optical wavelength : TRx1310nm (typically having a wavelength of 1310 or 1550)
Operating voltage: 3.3V
optical power information: 13dB
13.DOF carrier (fiber jumper switching action):


generally square head and round the above two kinds of the ODF.
Ultimately, we summarize the network transmission connections are:
Network equipment -> The optical module -> pigtail -> the ODF frame -> pigtail -> Splice cassette -> cable -> Splice cassette -> pigtail -> the ODF frame -> pigtail -> The optical module -> Network device