1. The principle
of optical fiber module 2. The classification of
optical fiber module 3. The method of using SFP + optical fiber module
4. The principle of optical fiber transceiver
5. The instruction of 100M optical fiber transceiver
6. The difference between optical fiber module and optical fiber transceiver
7. The optical fiber transceiver
8. Introduction to optical transceiver installation
9. Connection of optical fiber transceiver
1. The principle of optical fiber module
The optical fiber module is composed of optoelectronic devices, action circuits, and optical interfaces. The optoelectronic devices include two parts: transmitting and receiving.
Transmitting part: input the electrical signal of a certain code rate and process it by the internal driving chip to drive the semiconductor laser (LD) or light emitting diode (LED) to emit a modulated light signal of the corresponding rate, which has an optical power automatic control circuit inside to make the output The optical signal power remains stable.
Receiving part: After the optical signal with a certain code rate is input into the module, it is converted into an electrical signal by a light detection diode. After the preamplifier, an electrical signal with a corresponding code rate is output, and the output signal is generally at a PECL level. At the same time, when the input optical power is less than a certain value, an alarm signal will be output
Photodetector: restore the optical signal from the optical fiber to an electrical signal, then amplify, reshape, regenerate and restore the original shape, and then input it to the receiving terminal.
Second, the classification of fiber optic modules
According to the rate: 100Base (100M), 1000Base (Gigabit) for Ethernet applications, 155M, 622M, 2.5G, 10G for 10GESDH applications
According to package points: 1 & TImes; 9, SFF, SFP, GBIC, XENPAK, XFP,
1 & TImes; 9 package-soldering type optical module, the general speed is not higher than gigabit, mostly use SC interface
SFF package-soldering small package optical module, the general speed is not higher than gigabit, mostly use LC interface. SF (SmallFormFactor) small package optical module adopts advanced precision optics and circuit integration technology, the size is only half of the ordinary duplex SC (1X9) type optical fiber transceiver module, and the number of optical ports can be doubled in the same space.
GBIC package-hot-swappable Gigabit interface optical module, using SC interface. GBICGigaBitrateInterfaceConverter is an interface device that converts gigabit electrical signals into optical signals.
SFP package-hot-swappable small package module, currently the highest data rate can reach 4G, mostly use LC interface. The abbreviation of SFPSMALLFORMPLUGGABLE can be simply understood as an upgraded version of GBIC.
XENPAK package-used in 10 Gigabit Ethernet, using SC interface
XFP package-10G optical module, can be used in 10 Gigabit Ethernet, SONET and other systems, mostly using LC interface.
3. How to use SFP + optical fiber module
1. Select SFP + optical module
Before installing the SFP + optical module, you must select the appropriate optical module. So how to choose the right SFP + optical module? There are two main points, as follows:
2. Determine the required transmission distance
SFP + optical modules have different transmission distances of 150m, 300m, 10km, and 40km. You can choose the appropriate SFP + optical module according to the actual application.
3. Determine the wavelength limitation or requirement
Different types of SFP + optical modules can meet different wavelength requirements. Generally, there is a label on the top, bottom or side of the SFP + optical module. The label will explain the basic information of this optical module, so that you can easily identify and select the appropriate optical module. For example, the picture of Dell compatible SFP + optical module is shown below. From the label, it can be seen that it is an SFP + optical module with a wavelength of 850nm.
4. Install SFP + fast optical module
5. Remove the SFP + optical module from the protective packaging;
6. Hold the SFP + optical module between the thumb and index finger;
Insert the SFP + optical module into the SFP + slot of the switch, and apply slight pressure to the SFP + optical module until the device clicks and locks in place. If SFP + resists pressure, do not force it, you can turn it over, and then reinsert it into the SFP + slot; remove the dust cover from the SFP + optical hole and insert the optical cable.
7. Precautions for installing SFP + optical module:
8. The data rate of SFP + optical module and XFP optical module are both 10G, but they are not compatible with the same device, so do not install SFP + optical module in the XFP slot, you must ensure that the slot is SFP + slot before installation;
9. The appearance of SFP + optical modules and SFP optical modules are very similar, but their data rates and functions are different, so do not install SFP + optical modules in SFP slots. Before installing or using SFP + optical modules, you must ensure that your switch and SFP + optical modules are compatible with each other;
10. Check whether the SFP + optical module is the correct model for network configuration; before installing the SFP + optical module, make sure that it is clean and has not received any pollution;
Fiber optic equipment can emit laser or infrared light that harms your eyes, so do n’t look at the ports of the fiber or connector. You can assume that the fiber optic cable has been connected to the light source;
To prevent damage from electrostatic discharge, always wear an anti-static wrist strap;
Only trained personnel can install this product;
It takes about three minutes to install the SFP + optical module.
11. Remove SFP + optical module
12. Disconnect the optical fiber from the SFP + optical module;
Attach the dust cover to the fiber hole and connector;
Slide the latch handle down and use it to extract the SFP + optical module;
Pull out the SFP + optical module. If the SFP + optical module cannot be easily slid out of the slot, please use the side swing motion while pulling out the SFP + optical module from the slot;
Store the SFP + optical module in a safe place, and wait until the next time you need it, and then install it.
Fourth, the principle of optical fiber transceiver
The principle of the optical fiber transceiver is to exchange short-distance twisted pair electrical signals and long-distance optical signals. Optical fiber transceivers make use of optical fiber communication with its advantages of large information capacity, good confidentiality, light weight, small size, no relay, long transmission distance, etc., which solves the transmission problem of Ethernet well. It is well applied in the actual network environment where the Ethernet cable cannot cover and the fiber must be used to extend the transmission distance.
Fiber optic transceivers are generally used in actual network environments where Ethernet cables cannot be covered and optical fibers must be used to extend the transmission distance. At the same time, they also play a huge role in helping to connect the last mile of optical fiber lines to the metropolitan area network and more outer networks The role. With the optical fiber transceiver, it also provides a cheap solution for users who need to upgrade the system from copper wire to optical fiber, and for users who lack capital, manpower or time. The function of the optical fiber transceiver is to convert the electrical signal we want to send into an optical signal and send it out. At the same time, we can convert the received optical signal into an electrical signal and input it to our receiving end.
5. Instructions for 100M Fiber Transceiver
At present, the optical fiber interface type of the commonly used optical fiber transceiver of Vanke is SC connector
1. Wiring sequence of positive solution
Let's take NETLINK as an example to explain
2. Equipment introduction
Upper left corner-when bright it represents 1000M rate
Upper right corner-when lit, it represents 100M rate
Middle left-when it's on, it means that the pigtail has been connected, and if it's flashing, it's transmitting data
Middle right-when it is on, it means that the Internet cable has been connected, and when it flashes, it means that data is being transmitted
Lower left corner-when lit, it means the power cord is connected
Lower right corner-when on, it means full-duplex rate, when off, it means half-duplex
Indicator status in various situations.
(1) When plugged in separately
(2) When connecting the network cable
(3) When the fiber is connected separately
(4) When the transceiver works normally
Six, the difference between fiber optic modules and fiber optic transceivers
1. An optical module is a functional module, or an accessory, a passive device that cannot be used alone. It is only used in switches and devices with optical module slots; optical fiber transceivers are functional devices and are separate active devices. The device can be used alone with power.
2. The optical module itself can simplify the network and reduce the point of failure, and the use of optical fiber transceivers will add a lot of equipment, greatly increasing the failure rate and occupying the storage space of the cabinet, which is not beautiful.
3. The optical module supports hot swapping, and the configuration is relatively flexible; the optical fiber transceiver is relatively fixed, and replacement and upgrade will be more troublesome than the optical module.
4. The optical module is more expensive than the optical fiber transceiver, but it is relatively stable and not easy to damage; while the optical fiber transceiver is economical and practical, but the power adapter, fiber status, network cable status and other factors must be considered, and the transmission loss accounts for about 30% ;.
5. Optical modules are mainly used for optical interfaces of optical network communication equipment such as aggregation switches, core routers, DSLAM, OLT and other equipment, such as: computer video, data communication, wireless voice communication and other optical fiber network backbone networks; optical fiber transceiver applications In the actual network environment where the Ethernet cable cannot cover and must use optical fiber to extend the transmission distance, and is usually located in the access layer application of the broadband metropolitan area network, such as: high-definition video image transmission for monitoring security engineering and the last kilometer line of optical fiber Connected to the metropolitan area network and the outer network.
In addition, pay attention to several points when connecting the optical fiber module and the optical fiber transceiver: the wavelength and the transmission distance must be the same, for example, the wavelength is 1310nm or 850nm at the same time, the transmission distance is 10km; the fiber jumper or pigtail must be the same interface to connect Generally, the SC port used by the optical fiber transceiver and the LC port are used by the optical module. This point will prompt the choice of interface type when purchasing. At the same time, the rate of the optical fiber transceiver and the optical module must be the same. For example, the Gigabit transceiver corresponds to 1.25G optical module, 100M to 100M, and Gigabit to Gigabit; the optical fiber type of the optical module must be the same, single fiber to single fiber Dual fiber to dual fiber.
Optical fiber transceivers are very familiar products for optical fiber wiring. In optical fiber networks, we often use optical fiber transceivers. So, how should optical fiber transceivers be connected during network wiring?
7. Fiber Optic Transceiver
In the optical fiber transceiver, tx means transport, and rx means receive.
The function of the optical fiber transceiver is to convert the optical signal and the electrical signal, and vice versa. The process converts the electrical signal into an optical signal, transmits it through the optical fiber, and converts the optical signal into an electrical signal at the other end, and accesses routers, switches and other equipment If you want to use fiber optic transceivers to build your own local area network, the transceiver and the switch receive and send one by one, and convert each other.
8. Introduction to the installation of optical transceivers
1. First, see if the indicator of the optical fiber transceiver or optical module and the indicator of the twisted pair port are on?
a. If the indicator of the optical port (FX) of the transceiver is off, please confirm whether the fiber link is cross-linked? One end of the fiber jumper is connected in parallel; the other end is connected in cross mode.
b. If the optical port (FX) indicator of the A transceiver is on, and the optical port (FX) indicator of the B transceiver is off, the fault is at the A transceiver: one possibility is: A transceiver (TX) optical transmission The port is bad because the optical port (RX) of the B transceiver does not receive the optical signal; another possibility is: there is a problem with this fiber link of the optical transmission port of the A transceiver (TX) (the optical cable or the optical jumper may broken).
c. The twisted pair (TP) indicator is off. Please make sure that the twisted pair connection is wrong or the connection is wrong? Please use a continuity tester to test (however, the twisted pair indicator lights of some transceivers must wait until the fiber link is connected).
d. Some transceivers have two RJ45 ports: (To HUB) indicates that the connection line to the switch is a straight-through line; (To Node) indicates that the connection line to the switch is a crossover line.
e. Some hair extensions have an MPR switch on the side: it means that the connection line to the switch is a straight-through line; DTE switch: the connection line to the switch is a cross-over line.
9. Connection of optical fiber transceiver
Connection diagram of optical fiber transceiver
edit
Connection diagram of optical fiber transceiver
Schematic diagram of fiber optic transceiver connection
Schematic diagram of fiber optic transceiver connection
Point-to-point application of fiber optic transceivers
Point-to-point application of fiber optic transceivers
Fiber optic transceivers focus on remote multipoint applications
Fiber optic transceivers focus on remote multipoint applications
Application of centralized optical fiber transceiver in remote monitoring
Application of centralized optical fiber transceiver in remote monitoring
