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Clock adjustment method and line card for synchronous digital hierarchy (SDH) system

A technology for synchronizing digital series and clocks, applied in time division multiplexing systems, multiplexing communications, electrical components, etc., can solve problems such as SDH system instability, and achieve the effect of switching clocks smoothly

Inactive Publication Date: 2015-06-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the instability problem caused by clock switching to the whole SDH system, the present invention proposes a clock adjustment method and a line card for SDH system

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  • Clock adjustment method and line card for synchronous digital hierarchy (SDH) system
  • Clock adjustment method and line card for synchronous digital hierarchy (SDH) system
  • Clock adjustment method and line card for synchronous digital hierarchy (SDH) system

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Embodiment Construction

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0016] The SDH system uses multiple clock cards to provide clocks to all line cards that carry services, and both clock cards and line cards can use embedded systems (that is, single boards).

[0017] figure 2 A flowchart showing a clock adjustment method according to an embodiment of the present invention, including:

[0018] Step S10, the line card detects that the clock selection from the clock card has changed;

[0019] In step S20, the line card uses a low-priority task to process clock switching, so as to switch the SDH system to the changed clock.

[0020] This clock adjustment method sets the switching clock as a low priority, thereby ensuring the priority execution of other tasks in the ...

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Abstract

A clock adjustment method for a Synchronous Digital Hierarchy (SDH) system is disclosed in the present invention. The method includes that: a line card detects that a clock selection from clock cards changes; then the line card switches the clock by using a task with a low priority, in order to switch to the changed clock for the SDH system. A line card for an SDH system is also disclosed in the present invention. The present invention achieves the effect of smoothly switching the clock in the SDH system.

Description

technical field [0001] The invention relates to an optical synchronous digital transmission technology, in particular to a clock adjustment method and a line card for an SDH (Synchronous Digital Hierarchy, synchronous digital series) system. Background technique [0002] In the SDH communication system, since the instability of the clock source will affect the service, clock switching and phase adjustment are very important. Current clock chips generally integrate the functions of clock selection, clock adjustment and clock output, and can complete clock adjustment after clock switching, and then output the adjusted clock for use by other modules in the system. [0003] figure 1 A schematic diagram of clock adjustment for an SDH system according to related technologies is shown. [0004] The clock card (Clock Card) is on the left, including clock card 1 and clock card 2, which respectively provide two system clocks to the line card (Linecard-N) on the right. There are many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/1611
Inventor 彭成
Owner ZTE CORP