Methods and apparatus for implementing link capacity adjustment scheme sinking with rate based flow control

A rate and input rate technology, applied in the field of preventing data loss on LCAS sinks, and can solve problems such as complex control mechanisms and head-of-line blocking

Inactive Publication Date: 2007-04-11
TRANSWITCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, disconnecting the deskew FIFO 18 causes the head-of-line blocking described above, so depth measurements in the deskew desk FIFO 18 are sometimes used to re-enable the flow
The control mechanisms for these systems are extremely complex, especially when dealing with multiple client ports

Method used

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  • Methods and apparatus for implementing link capacity adjustment scheme sinking with rate based flow control
  • Methods and apparatus for implementing link capacity adjustment scheme sinking with rate based flow control
  • Methods and apparatus for implementing link capacity adjustment scheme sinking with rate based flow control

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Embodiment Construction

[0032] Referring now to FIG. 2, a system 110 for recovering packetized (eg, Ethernet) data from SONET / SDH considering VCAT and LCAS is illustrated in accordance with the present invention. Apparatus 110 is similar in some respects to apparatus 10 described above, and like reference numerals (incremented by 100) denote like functional blocks. The front end block 112 performs the well-known SONET / SDH functions of descrambling, framing, pointer tracking and alignment. The VCAT and LCAS block 114 extracts the VCG differential delay information and VCG configuration information embedded in one of the SONET / SDH overhead bytes (H4 in high order, K4 in low order). This VCG information is then passed to the deskew control block 116 along with the payload. The deskew control block 116 performs two functions. First, it calculates the amount of differential delay encountered by each branch based on the H4 / K4 frame counter. It then stores the branches in the deskew FIFO 118 for differen...

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Abstract

Methods for extracting packetized data from a SONET / SDH signal include processing the signal to produce a deskewed data stream; demapping the data stream to produce a stream of packets; and temporarily storing the packets in a packet buffer, wherein the demapping is performed at a first rate when the fullness of the buffer is below a fullness threshold and the demapping is performed at a second rate when the fullness of the buffer is at or above the fullness threshold. Apparatus for performing the methods are also disclosed.

Description

technical field [0001] The present invention relates to telecommunications, Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH). More particularly, the present invention relates to methods and apparatus for preventing data loss on LCAS sinks. Background technique [0002] The well-known European Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) is a commonly used telecommunication transmission scheme, which is designed to accommodate DS-1 (T1) and E1 services and their multiples (DS-3 and E-3). The DS-1 signal consists of up to twenty-four time division multiplexed DS-0 signals plus overhead bits. Each DS-0 signal is a 64kb / s signal and is the smallest bandwidth allocation in a digital network, ie enough for a single telephone connection. The E1 signal consists of up to thirty-two time-division multiplexed DS-0 signals, at least one of which DS-0 carries overhead information. [0003] SONET, developed in the early 1980s, ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04J3/06H04J3/16
CPCH04J3/0632H04J2203/0094H04J3/1617
Inventor R·W·汉林S·伯恩
Owner TRANSWITCH
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