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Clock data recovery method and device for branch signals in SDH (synchronous digital hierarchy)

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

Active Publication Date: 2014-12-17
ZTE CORP
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  • 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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  • Clock data recovery method and device for branch signals in SDH (synchronous digital hierarchy)
  • Clock data recovery method and device for branch signals in SDH (synchronous digital hierarchy)
  • Clock data recovery method and device for branch signals in SDH (synchronous digital hierarchy)

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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 clock data recovery method and device for branch signals in SDH (synchronous digital hierarchy). The method includes the steps: effective data of signals is extracted from each time slot of an SDH frame structure and stored in a storage space which each time slot of a cache corresponds to; clock signals and read signals of each time slot are recovered in a time division multiplexing manner; when the read signals of one time slot are valid, data contents are read from the storage space of the time slot of the cache and latched to a latch of the time slot. The device comprises a data extraction module, a clock recovery circuit and a data recovery module. According to the method and the device, recovered clocks and data can be recovered from multiple of multiple E1 or T1 signals via one set of clock recovery circuits by means of time division multiplexing, and circuit resources are greatly saved.

Description

technical field [0001] The 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 for short). 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 informa...

Claims

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Application Information

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