In this era of information industrialization, whether it is the application of emerging technologies or the construction of smart cities, the application is certainly inseparable from the basic network. The construction of the essential network is mainly based on the site, active terminals and interconnection products, and the basic interconnection channel-wiring system for the construction of the network. The wiring system needs to be installed and installed on site.It is susceptible to factors such as the environment, product quality, and installation process. It is the most important link in determining the quality of network transmission. The reliability of the wiring system depends not only on the quality supervision in the project.But it also on the final check and on-site acceptance testing. Now introduces you to the optical fiber link test.
10G fiber link test
The MPO connector can support at least 12-core optical fiber, and the MPO connector is principally used for pre-connected optical cables. Because there are 12-core channels for MPO fiber, for duplex transmission, there are mainly three types of connection methods of A, B, and C (MPO fiber link polarity. The three methods are for the transmission end to connect to the reception end. The compatibility and consistency of the links. In the 10G Fibre Channel, the polarity of the MPO backbone link is mainly in the type B mode. The two ends are converted into the LC interface through the MPO to LC transceiver box, and then connected to the device through the LC jumper. This situation is mainly used in high-density wiring systems in data centers.
Link under test:
1 MPO-MPO fiber jumper, with MPO-LC transceiver backbone links at both ends
1) Collection the benchmark:
Two FC-LC test jumpers connect the light source and optical power meter.
2) Disconnect the jumper and the adapter
3) Connect the optical fiber under test (MPO-LC transceiver box at both ends, MPO-MPO pre-connected optical cable in the middle), and connect the LC test jumper to the two ports of the transceiver at both ends.
4) Record and save the loss value of the current tested fiber channel, and replace the source of light end LC jumper to the transceiver 2-12 port record and save until the loss test of 12 channels is completed.
400G / 100G MPO fiber link test
A standard MPO / MTP link is composed of two MPO jumpers at both ends, two MPO adapters and MPO's pre-connected backbone optical cable. In TIA- 568-C.0-2009B.4, for parallel multi-channel transmission, A and B are given.
In order to guarantee the compatibility and unity of the link, construction and maintenance are more convenient, especially MPO patch cords that are frequently plugged and replaced. In the 40G / 100G wiring system, Mode B is more commonly used. The number of channels of 40G and 100G are different, but the transmission link model is the same, both use MPO / MTP interface for end-to-end transmission. Therefore, we take 40G single- channel transmission as an example. When testing, we need to pay attention to the types of ports that are pre-connected with optical cables and jumpers-with and without guide pins (male).
The following is the most common MPO fiber link model with no guide pin (female) at both ends.
Tools: MPO light source and MPO optical power meter (MPO dedicated test source of light and optical power meter, the instrument's MPO port contains 12 light source outlets and optical power meter inlets).
1) Place the benchmark:
Use MPO-MPO (male-male) jumper to short-circuit the MPO source of light and MPO optical power meter, first select the polarity corresponding to the jumper on the instrument, and then press the reference value (setting reference) setting button, then the optical power meter Record the initial optical power value received.
2) Join MPO-MPO (male-male)
Keep the jumper connection at the light source end unchanged, only unplug the jumper plug of the optical power meter, and add an MPO-MPO (male-male) test jumper of qualified quality and correct polarity to the optical power meter (should be in advance Test passed).
Place the instrument on the main test interface, insert the test jumpers on the source of light and the optical power meter into the two ends of the link under test, press the test button, and the instrument will give a pass / fail result (or give a similar prompt after a few seconds) (Picture), press the storage button, name and save the test results. Continue to test the next MPO fiber.
Because fiber links have great advantages in meeting people's demand for high bandwidth, the use of optical fibers is becomer wider. Whether wiring construction personnel or network maintenance personnel.It is necessary to master the skills of fiber link testing.Read more:https://www.oemfibers.com