Fiber patch cords are widely used in network engineering, especially in today's cloud computing era, where server access network ports have been upgraded to 10G fiber. , basically all cables carrying service traffic are optical fibers.
Speaking of optical fiber patch cords, I always think of a very embarrassing situation, that is, many network engineers who have just debuted can't distinguish the three most common types of optical fiber connectors in our digital communication field, and can't distinguish the big square head, What are the small square head, the round head, and the corresponding English abbreviation model? When the project needs to communicate and participate in the integrated wiring design in the early stage of the project, it is difficult to distinguish the model names of several optical fiber jumper interfaces. It is easy to communicate with the same model name. The novice cabling designers had poor communication and misunderstandings, which resulted in the wrong type of optical fiber interface on the cabling drawings and the actual requirements. Finally, there was an engineering tragedy in which the interface of the customized optical fiber jumper did not match the equipment interface. So today we will talk about the three most common types of connectors for fiber optic patch cords.
Weak current engineering fiber optic connector
1. The first is the big square head connector:
SC type fiber optic connector
The large square head joint is the SC type joint, and its outer casing is rectangular, and the structural dimensions of the pins and coupling sleeves used are exactly the same as those of the small square head (FC type).
The large square head jumper adopts a plug-in and latch-type fastening method, which does not need to be rotated. The plug-in operation is very convenient, and the insertion loss fluctuation is small. It has the advantages of strong compression resistance and high installation density.
Commonly adapted optical modules are as follows:
GBIC optical module
XENPAK Optical Module
X2 optical module
CFP optical module
2. Then the small square head connector:
LC type fiber optic connector connector
The small square head connector is the LC type connector. The small square head connector adopts the fastening method of the modular jack (RJ) latch, which is plug and play. use, suitable for high-density connections.
Commonly adapted optical modules are as follows:
SPF optical module
QSFP optical module
CFP2 Optical Module
CFP4 Optical Module
3, followed by the round head joint:
FC type fiber optic connector connector
The round head joint is the FC type joint. The round head joint adopts the fastening method of the turnbuckle, and the external reinforcement method adopts the metal sleeve, which is relatively firm after being inserted into the device, and the connector is not easy to fall off. Generally, it is used on the ODF side (wiring). The most used on the rack) is generally used for the equipment port to connect the ODU on the optical disk
4. Snap-on circular joint
The snap-on circular joint is ST-type joint. The shell of the snap-on round joint is round, and the fastening method is a turnbuckle. After inserting, there is a bayonet to fix it in half a circle. The tricky point is that it is easier to disassemble and install. break. Fortunately, it is rarely used. I have never seen a module interface that can be connected to this kind of connector on network equipment, but I have seen an interface that can be plugged into this kind of connector on transmission equipment such as optical transceivers.
5. MPO/MPT connector
Let me first point out that this kind of joint is rare now, which does not mean that it will be rare in the future.
MPO connector is a multi-core and multi-channel plug-in connector. Generally speaking, a connector can accommodate multiple optical fiber cores, unlike SC, FC, LC, and ST connectors, when one connector and one core connect equipment Usually used in pairs.
It should be noted that MPO and MTP are not two types of connectors, but the MTP connector is a type of MPO connector.
MTP is the registered trademark of Conec Corporation in the United States. They claim that the MPO connectors they produce are much stronger than the general MPO connectors, so in order to distinguish them from the MPO connectors on the market, they call their products MTP connectors.
There are three types of MPO connectors: 8/12/24 pins.
The 8-pin is the connector on the left, only four pins on both sides are used, and the 12-pin is all used.
24 cores are crazy to use 2 rows of 12 cores.
Moreover, the MPO connector is smaller than the SC connector. With such a dense layout of 24 cores, the probability of a single core failure may be relatively, relatively cough.
MPO female fiber optic connector
MPO female fiber optic connectors are generally used to connect the connectors of equipment optical modules.
MPO male fiber optic connector
MPO male fiber optic connectors are generally used as trunking cables.
MPO connector can connect five modules: OSFP, QSPF+, QSFP28 SR4, QSFP28 PSM4, QSFP DD
