Damage-free switching method for main and spare synchronous digital series device timing source

A technology of synchronizing digital series and timing source, applied in transmission systems, electrical components, etc., can solve problems such as scalability limitations, unsuppressed noise, and high PCB layout and wiring requirements
CN1555168AInactive Publication Date: 2004-12-15FENGHUO COMM SCI & TECH CO LTD
0 Cites 12 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
FENGHUO COMM SCI & TECH CO LTD
Publication Date
2004-12-15
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A harmless switching method for SETS function modules in a SDH system includes: mutually sending clock and frame location pulse between master and alternative modules for controlling state signals to control the one-from-two logic circuit to make the phase and frequency of the output system clocks and system frame location pulses of the two modules completely the same, each own voltage-control oscillator traces the same timing source. A returned button is set in them for controlling the alternative turning to the master by triggering it manually and the original master module is activated to realize switching. The alternative module output clock and the frame timing pulse are at ordinary output state not controlled by three states output. The module switch time scale is selected in the sphere of frame head so that the frame location pulse is continuous and a line interface module processes the clock sent by the master, alternative timing souses function module smoothly after one-from-two logic circuit.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a method for providing a stable timing signal in a Synchronous Digital Hierarchy (SDH) system, in particular to a Synchronous Digital Hierarchy Timing Source (SETS) functional module (or other modules comprising such modules) in a Synchronous Digital Hierarchy (SDH) system ) method for lossless switching. Background technique

[0002] For the normal operation of the SDH system, two synchronous digital series timing source modules (SETS) are generally provided in the system, one of which is used as the main module and the other is used as the backup module, and the main module and the backup module are mutually backup. During the working process of the SDH system, once the SETS main module fails, the system will start the standby module in the hot backup state to realize the automatic switching of the main and standby modules. When system maintenance is required, or when the maintenance personnel are upgrading the softw...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More