SC Loopback cable

Loopback Cable Specification

Items BIF Single mode fiber-9/125 G657 A1 BIF Multimode fiber-50/125 or 62.5/125
Insertion loss


0.2dB 0.2dB
Insertion loss


0.3dB 0.3dB
Return loss UPC>50dB; APC>60dB >35dB
Operating& Storage temperature range -40°C to +75°C
Repeat Ability < 0.5dB (500 Cycle Passed)


Material’s details



When it comes to practical application, fiber optic loopback test is often employed for checking fiber optic transceivers. Since transceiver has two ports for receiving and transmitting the light signal, it is necessary to test the ports to see whether they are still under operation. Thus, fiber optic loopback test is the most convenient way for transceiver maintenance. The testing process is by routing the laser signal from the transmitter port back to the receiver port. Then the transmitted pattern is compared with the received pattern to make sure they are identical and have no error.





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Fiber Optic Loopback modules are also called optical loopback adapters. They are designed for testing, engineering and the burning stage of boards or other equipment. Fiber loopback provide system test engineers a simple but effective way of testing the transmission capability and the receiver sensitivity of network equipment.


Fiber Optic Loopback is providing a media of return patch for a fiber optic signal. Typically, it is used for fiber optic testing applications or network restorations.


When used in testing applications, loopback signals are used for diagnosing problems. The best practice is to send a loopback test to network equipment, one at a time for isolating the problem.


SC Fiber optic loopbacks are designed in a compact footprint. They are compliant with fast Ethernet, fiber channel, ATM and Gigabit Ethernet.



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