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A kind of clock and data recovery method and device of tributary signal in SDH

A signal and data technology, applied in the field of clock data recovery, can solve the problems of consumption and resource consumption

Active Publication Date: 2018-05-25
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For STM-16, there are 1008 channels of E1 signals, which need to consume 1008 resources, and the resource consumption is very large

Method used

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  • A kind of clock and data recovery method and device of tributary signal in SDH
  • A kind of clock and data recovery method and device of tributary signal in SDH
  • A kind of clock and data recovery method and device of tributary signal in SDH

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Embodiment

[0084] The frame structure corresponding to the STM-1 level of the SDH synchronous digital transmission system adopts a 9-row*270-column byte frame structure, and the time slot uses byte interleaving to form a frame structure. figure 1 A schematic diagram of the SDH frame structure taking the E1 signal as an example is given in . In a frame, the first 9 columns of the frame structure are section overhead bytes POH and pointer bytes, of which 1-3 lines are regeneration section overhead RSOH, 5-9 lines are multiplex section overhead MSOH, and line 4 is pointer bytes, and the remaining information bytes are the information payload area. In the STM-1 frame, 63 channels of E1 signals can be carried. Each channel of E1 signals occupies 4 columns in the STM-1 frame. The 63 channels of E1 signals occupy a total of 63*4=252 columns. The 63 channels of E1 signals are respectively interleaved and arranged according to Arranged in the order of 1-63, 1-63, 1-63, 1-63. In the STM-1 frame,...

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Abstract

The invention discloses a method and device for recovering clock data of branch signals in SDH, wherein the method includes: extracting effective data of the signal from each channel time slot in SDH frame structure of the synchronous digital system, and storing them in each channel in the cache In the storage space corresponding to the time slot; the clock signal and the readout signal of each time slot are recovered by time division multiplexing; when the readout signal of a certain time slot is valid, the storage corresponding to the time slot in the cache The data content is read out from the space and latched into the latch corresponding to the time slot; the device includes: a data extraction module, a clock recovery circuit and a data recovery module. The method and device of the present invention adopt a set of clock recovery circuit for multi-channel E1 or T1 signals, and adopt the method of time-division multiplexing to recover the recovered clock and data of multiple branch signals at the same time, greatly saving circuit resources.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for recovering clock data of tributary signals in SDH (Synchronous Digital Hierarchy). Background technique [0002] With the development of information technology and people's huge demand for communication bandwidth, the communication network has changed from analog network to digital network. The development of optical fiber technology has greatly promoted the development of digital communication technology to meet people's demand for communication bandwidth. Optical fiber communication provides low-cost, high-speed information services, rapidly replacing traditional copper cable communication. In order to adapt to the development of optical fiber technology, unify the products of various communication manufacturers, and realize the intercommunication of transmission information, the ITU has formulated the communication standard of SDH. The frame informati...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/076H04L67/568H04J3/0623H04L5/22H04L7/0016
Inventor 刘峰徐继超
Owner ZTE CORP