Abstract: An autonomous failure recovery method and a system for a fiber-optic communication system. The method comprises acquiring a real-time operation timing sequence of a digital high-speed serial transceiver of a fiber-optic communication system, and comparing the operation timing sequence against a pre-stored reference timing sequence of normal operation of the serial transceiver; when the operation timing sequence is inconsistent with the reference timing sequence, determining that failure of an optical path of the fiber-optic communication system has occurred; sending a pre-determined autonomous recovery timing sequence to the serial transceiver when the optical path is in a failure state, and performing an autonomous failure recovery operation of the fiber-optic communication system in response to the autonomous recovery timing sequence.

Abstract: A redundant backup near-end machine, a far-end machine and a system of a digital optical fiber repeater is disclosed. It includes a near-end machine, a far-end machine and an optical fiber, and the near-end machine includes a near-end duplexer module, at least two near-end digital monitoring modules, and a near-end optical interface board module. The near-end optical interface board module includes a near-end digital optical module, and each near-end digital monitoring module is connected in parallel between the near-end duplexer module and the near-end optical interface board module. The far-end machine includes a far-end optical interface board module, at least two far-end digital monitoring modules, a power amplifier module, and a far-end low noise amplifier duplexer module. The far-end optical interface board module includes a far-end digital optical module.

Abstract: A transmission device and an antenna down-tilt control system includes: an input component, comprising an inner gear ring, a first gear and a second gear both coaxial with the inner gear ring, and a third gear engaged with the first gear; a unidirectional control mechanism, comprising a first unidirectional component, the first unidirectional component comprising a first rotating member that can unidirectionally rotate in a first rotation direction, the first rotating member being fixedly connected to the inner gear ring; an output component, comprising at least two fourth gears arranged at an interval in a circumferential direction, the third gear being selectively engaged with any one of the fourth gears; and a rotary component, comprising a fifth gear and a rotary box.

Abstract: A redundant backup near-end machine, a far-end machine and a system of a digital optical fiber repeater is disclosed. It includes a near-end machine, a far-end machine and an optical fiber, and the near-end machine includes a near-end duplexer module, at least two near-end digital monitoring modules, and a near-end optical interface board module. The near-end optical interface board module includes a near-end digital optical module, and each near-end digital monitoring module is connected in parallel between the near-end duplexer module and the near-end optical interface board module. The far-end machine includes a far-end optical interface board module, at least two far-end digital monitoring modules, a power amplifier module, and a far-end low noise amplifier duplexer module. The far-end optical interface board module includes a far-end digital optical module.

Abstract: A combiner with a common port and a dually layered cavity includes a cavity, a clapboard used for dividing the cavity into an upper cavity and a lower cavity, a common port, a number of signal posts, and a first coupling disc, said common port and said number of signal ports being disposed at two sides of the cavity respectively. The upper cavity and the lower cavity are each provided with a number of filter paths, and an upper common harmonic post and a lower common harmonic post are disposed at a location close to the common port; a first coupling hole is defined in the clapboard at a location close to the common port, and the first coupling disc is disposed in the first coupling hole and connected with the common port.