Virtual cascade time delay compensation restoring apparatus

Abstract

The device consists of cascade multiframe detection circuit for carry on sequence number locking detection, cascade sequence automatic regulation circuit for regulating reservoir sequence based on sequence number of each different reservior in cascade set to make it be in accordance with its sequence at transmission end, buffer zone for making zone as per sequence number of reservior and cascade multiframe, write control circuit for writing content in sequenced reservior to relevant buffer zone, read control repositioning and adaptive circuit for regulating frequency and plase of reservoir and read control circuit for reading out data from buffer zone to finalize restoration of cascade as per command of abovesaid circuit.

Description

technical field [0001] The invention relates to a synchronous digital system SDH transmission network, in particular to a virtual concatenation delay compensation recovery device for transmitting data using a virtual concatenation technology. 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...

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Problems solved by technology

[0005] In order to effectively utilize the limited bandwidth, SDH introduces the concept of virtual concatenation transmission, which is a mechanism for logically bundling multiple containers of the same type to transmit services. Physically, the transmission methods of these containers are the same as before. , in the actual operation, the logically bundled containers are sent at the same time at the sending end, but due to the inconsistency of the transmission path, different delays are generated. At the receiving end, it is necessary to compensate these delays so that the business The receiving end can recover normally; at the same time, due to various reasons, the SDH network does not always work in a synchronous state, that is, the clock references used by the sending end and the receiving end are inconsistent, which will cause SDH pointer adjustment , so that the phase of the container arriving at the receiving end drifts, which may cause the delay recovery circuit to work abnormally; secondly, various abnormalities may occur in the SDH transmission network during operation

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