Fiber access time service apparatus with time delay measuring system

Abstract

The invention provides a fiber access time service apparatus with a time delay measuring system, utilizing a global position time service system to carry out clock calibration on at least one building base band unit. The fiber access time service apparatus comprises a near-end reception module, at least one far-end reception module and a time delay measuring system. The near-end reception module is used for receiving a global positioning time service electric signal exteriorly and converting the signal to a time service optical signal. The at least one far-end reception module is used for receiving a time service optical signal from the near-end reception module and converting the signal to a time service optical signal through photoelectric conversion. The time delay measuring system is used for measuring fiber time delay between the near-end module and the at least one far-end reception module corresponding to the near-end module, and transmitting the time delay to the corresponding at least one building base band unit through the far-end reception module for carrying out clock calibration. According to the fiber access time service apparatus provided in the invention, the time delay measuring system automatically measures the fiber time delay between the near-end reception module and the at least one far-end reception module, and transmits the time delay to the corresponding building base band unit. The operation of the apparatus is simple.

Description

technical field [0001] The invention relates to a delay measurement technology, in particular to an optical fiber access timing device with a delay measurement system. Background technique [0002] In the existing repeater system, one near-end module can communicate with multiple far-end modules via optical fiber, and the clock of the indoor baseband processing unit (Building Base band unit, BBU) is usually received from the near-end optical module by the far-end optical module. Synchronize with the clock signal provided by the global positioning system (Global Position System, GPS) timing system for calibration. [0003] However, when the near-end optical module communicates with the far-end optical module through optical fiber, it is inconvenient to manually measure the length of the optical fiber, so the fiber delay cannot be calculated, so the time signal received by the BBU is different from the local time signal of the near-end optical module. The GPS time signal is n...

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Problems solved by technology

[0003] However, when the near-end optical module communicates with the far-end optical module through optical fiber, it is inconvenient to manually measure the length of the optical fiber, so the fiber delay cannot be calculated, so the time signal received by the BBU is different from the local time signal of the near-end optical module. The GPS time signal is not synchronized, causing the BBU to fail to communicate normally

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