Knowledge

When an armored optical cable is terminated, the metal reinforcement core and armor layer require three more processes: fixing, insulation, and grounding than ordinary optical fiber. This article records the standard practices at the ODF and wall box ends, and clarifies the responsibilities of armor layer grounding and lightning arresters.

Links must be repaired several times a year in places with severe rodent infestations such as grain depots, catering back yards, and riverside pumping stations. This article explains the protection classification method according to the three types of armored structures: corrugated steel belt, flat steel belt and stainless steel braid, as well as the matching principles of end pigtails and jumpers.

The shaft simultaneously undertakes the triple tasks of vertical laying, fire prevention sealing and rodent prevention. This article combs through the three acceptance points of reserved ring diameter, fireproof clamp fixing position and orifice sealing method, and explains when to use armored jumpers for end protection.

The section where outdoor optical cables are led down from the pole along the wall to the hole is prone to fiber breakage. This article summarizes the key points of three acceptable parameters for the construction of armored optical cables: bending radius, fixture spacing, and ground entry section processing, for comparison between construction and acceptance.

The fusion splicer displays normally, but the OTDR reads abnormal values. The problem often lies in the optical fiber material itself. This article explains the directional deviation caused by mode field diameter mismatch, the test wavelength windows of single-mode and multi-mode, and on-site avoidance practices.

The same 0.1 dB step may have completely different causes. This article provides judgment basis based on four types of non-reflective steps, reflective peaks, ghosts and terminal noise, and corresponds to the four types of processing: cleaning, cutting, gear and pulse width.

Completion acceptance requires more than just passing the test. This article provides an acceptance data table structure that can be directly applied, including a core-by-core field list, threshold sources, two-way test recording methods, and a retest closed-loop writing method for unqualified points.

How many dB the link has dropped? The most direct evidence during acceptance comes from the insertion loss method of a stable light source optical power meter. This article explains the key points of setting the reference line, measuring each dual wavelength, and what each of it and the OTDR is responsible for.

Two closely spaced welding points form a bulge on the OTDR curve, which may be due to the event blind area not being properly handled. This article explains the conversion of blind zone and pulse width, distance gear and average time settings, and why two-way testing is necessary to average.

Discharge calibration is not a matter of pressing a button. This article provides three criteria: electrode wear, environmental drift and three-core fusion test, as well as the operation sequence from cleaning to parameter locking to help stabilize the welding loss within 0.05 dB.