When the link margin is insufficient, the first reaction of many colleagues is to replace the optical module with a longer distance.In fact, the intrinsic attenuation of optical fibers is only a small part, and the actual amount of margin eaten is often the bending left by the fusion joints, connector end faces and construction.Troubleshooting is much

more effective than changing modules blindly. The optical fiber

itself is the background color, and it can't account for the big head. The single mode is about 0.35 dB/km in the 1310 window, about 0.25 dB/km in the 1550 window, and the fiber loss of the ten kilometer link is only 3 to 3.5 dB.That is, if the measured loss of a normal short-range link reaches 8 dB, the problem is almost certainly in the connector and process, not the line length. The connector and the fusion point

are the big losers The movable connector is a

• normal pair of 0.3 to 0.5 dB, and the end surface can be dirty or scratched by more than 1 dB The welding point is
• typically 0.05 to 0.1 dB, it is recommended to average the value in both directions, and the one-way reading is easy to be large. After
• the ODF adapter is plugged in multiple times, the pressure of the shrapnel drops, and the loss
• slowly accumulates. The jumper is stepped on or bent at an acute angle, and the

breakpoint is often hidden near the plugThe jumper specifications should also be alignedwith the environment, LC-LC single-mode dual-core jumper Suitable for wiring rack to equipment,field or machine room rodent-proof environment Single-mode dual-core armored jumper, mouse-resistant jumper, special jumper for Internetcafes, tail fiber

More reliable. Hidden losses due to bending

and squeezing The 1550 window is much more sensitive to macro bends than the 1310, and losses that are only visible on the long wavelength side occur when the bending radius is too small.In engineering, it is generally required that the static laying radius is not less than ten times the outer diameter of the optical cable, and the common sheathed optical cable is controlled to be more than 30 mm; the bending jumper can be smaller, but it cannot be tightened against the edge of the metal wire slot.In particular,check the tightness of the cable ties in the.

vibration environment of the power field station, see Power and new energy station communication transformation plan The suggestion for troubleshooting order is: first clean the end face for retesting, then use OTDR to find the reflection event to locate the connector, and finally check the bending and tie.Contact EB-LINK to assist in interpreting the test curve, phone 0755-83179002, if self-handling still fails to converge.