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Synchronous multiplexing method on basis of asynchronous system

A complex and systematic technology, applied in digital transmission systems, electrical components, error prevention, etc., can solve the problems of the complex and multiplexer being unable to recover the clock, unable to be used as the working clock of the equipment, affecting the communication quality, etc., to simplify the complex The effect of tapping the processing process, improving the channel utilization rate, and simplifying the signaling interaction process

Active Publication Date: 2015-04-15
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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AI Technical Summary

Problems solved by technology

[0002] Due to the characteristics of the wireless channel, the multiplexer cannot recover a stable clock from the wirelessly transmitted group signal
The group clock can only be used to receive group data, and cannot be used as the working clock of the device
If the multiplexer works in quasi-synchronous mode, it will cause code slip on the group line and affect the communication quality

Method used

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  • Synchronous multiplexing method on basis of asynchronous system
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  • Synchronous multiplexing method on basis of asynchronous system

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Embodiment Construction

[0038] The invention adopts the synchronous multiple tap method based on the asynchronous system, and solves the problem of realizing the synchronous multiple tap when the multiple tap cannot restore the timing signal from the received group signal.

[0039] A kind of synchronous multiple tapping method based on asynchronous system, comprising multiplexing process and tapping process, is characterized in that comprising steps:

[0040] Multiplexing process

[0041] (1) Perform interface adaptation for each accessed service data;

[0042] (2) cache the service data after interface adaptation in each service receiving buffer area, and form each service data into a data frame according to the multiplexed frame structure;

[0043] The multiplexing frame structure is as follows figure 1 As shown, the specific description is:

[0044] ①Frame header: 1 byte, which is the frame positioning signal;

[0045] ②Indication field: 2 bytes, used to transmit control information, such as ...

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Abstract

The invention provides a synchronous multiplexing method on the basis of an asynchronous system, which mainly solves the problem of implementing a synchronous multiplexer when a multiplexer cannot recover a timing signal from received group signals. According to the invention, a conventional mode that a conventional synchronous multiplexer multiplexes according to a time slot is changed, a frame transmission mode of the asynchronous system is introduced into the synchronous multiplexer and the multiplexing of data, voice and an Ethernet signal when a group line cannot transmit a synchronizing signal. According to the invention, the frame transmission mode is adopted and the transmission of different types of services is implemented; by utilizing frame padding, a slip code caused by different clock sources is effectively avoided; a dynamic multiplexing technology is adopted, the channel bandwidth is saved and the channel utilization rate is improved; the multiplexing of various types of data services with different rates can be implemented and the data occupies the group bandwidth according to an original rate; and an error-correcting code is added into a control / state field of a multiplexed frame, so that the misrepresentation of the integral frame, which is caused by the channel error code, is effectively avoided.

Description

technical field [0001] The invention proposes a synchronous multiple tap method based on an asynchronous system, which mainly solves the problem of realizing the synchronous multiple tap when the multiple tap cannot recover the timing signal from the received group signal. Background technique [0002] Due to the characteristics of the wireless channel, the multiplexer cannot recover a stable clock from the wirelessly transmitted group signal. The group clock can only be used to receive group data, and cannot be used as the working clock of the device. If the multiplexer works in quasi-synchronous mode, it will cause code slip on the group line and affect the communication quality. [0003] Multiple splitter business types include data, voice and Ethernet services. Among them, the data interface is multi-channel, and the rate is 0-115.2kbps optional. The group interface is an RS422 interface with a rate of 2Mbps. According to the traditional time slot multiplexing, the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/951H04L1/00H04L27/26H04L47/43
Inventor 刘咏荷
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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