公开(公告)号：US07349444B2

公开(公告)日：2008-03-25

申请号：US10924046

申请日：2004-08-23

申请人： Daniel C. Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Van Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

发明人： Daniel C. Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Van Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

IPC分类号： H04J3/06

CPC分类号： H04J3/0623

摘要： Methods for retiming SONET signals include demultiplexing STS-1 signals from an STS-N signal, buffering each of the STS-1 signals in a FIFO, determining the FIFO depth over time, and determining a pointer leak rate based in part on FIFO depth and also based on the rate of received pointer movements. According to the presently preferred embodiment, each FIFO is 29 bytes deep. If FIFO depth is 12-17 bytes, no leaking is performed. If the depth is 8-12 bytes or 17-21 bytes, a slow leak rate is set. If the depth is 4-8 bytes or 21-25 bytes, a fast leak rate is set. If the depth is 0-4 bytes or 25-29 bytes, pointer movements are immediate. The calculated leak rates are based on the net number of pointer movements (magnitude of positive and negative movements summed) received during a sliding window of n×32 seconds (n×256,000 frames).

摘要翻译： 重新定时SONET信号的方法包括从STS-N信号中解复用STS-1信号，缓冲FIFO中的每个STS-1信号，确定随时间的FIFO深度，以及部分地基于FIFO深度确定指针泄漏率， 也基于接收到的指针移动速率。 根据当前优选的实施例，每个FIFO是29字节深。 如果FIFO深度为12-17字节，则不会发生泄漏。 如果深度为8-12字节或17-21字节，则设置缓慢的泄漏率。 如果深度为4-8字节或21-25字节，则设置快速泄漏率。 如果深度为0-4字节或25-29字节，则指针移动立即。 计算的泄漏率基于在nx32秒（nx256,000帧）的滑动窗口期间接收到的指针移动的净数（正和负移动相加的大小）。

公开(公告)号：US20060039415A1

公开(公告)日：2006-02-23

申请号：US10924046

申请日：2004-08-23

申请人： Daniel Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

发明人： Daniel Upp ,  Suvhasis Mukhopadhyay ,  Bart Brosens ,  Kris Aken ,  Chitra Wadhwa ,  Sachin Mathur ,  Ramses Valvekens

IPC分类号： H04J3/04

CPC分类号： H04J3/0623

摘要： Methods for retiming SONET signals include demultiplexing STS-1 signals from an STS-N signal, buffering each of the STS-1 signals in a FIFO, determining the FIFO depth over time, and determining a pointer leak rate based in part on FIFO depth and also based on the rate of received pointer movements. According to the presently preferred embodiment, each FIFO is 29 bytes deep. If FIFO depth is 12-17 bytes, no leaking is performed. If the depth is 8-12 bytes or 17-21 bytes, a slow leak rate is set. If the depth is 4-8 bytes or 21-25 bytes, a fast leak rate is set. If the depth is 0-4 bytes or 25-29 bytes, pointer movements are immediate. The calculated leak rates are based on the net number of pointer movements (magnitude of positive and negative movements summed) received during a sliding window of n×32 seconds (n×256,000 frames).

摘要翻译： 重新定时SONET信号的方法包括从STS-N信号中解复用STS-1信号，缓冲FIFO中的每个STS-1信号，确定随时间的FIFO深度，以及部分地基于FIFO深度确定指针泄漏率， 也基于接收到的指针移动速率。 根据当前优选的实施例，每个FIFO是29字节深。 如果FIFO深度为12-17字节，则不会发生泄漏。 如果深度为8-12字节或17-21字节，则设置缓慢的泄漏率。 如果深度为4-8字节或21-25字节，则设置快速泄漏率。 如果深度为0-4字节或25-29字节，则指针移动立即。 计算的泄漏率基于在nx32秒（nx256,000帧）的滑动窗口期间接收到的指针移动的净数（正和负移动相加的大小）。

公开(公告)号：US20060039411A1

公开(公告)日：2006-02-23

申请号：US10924042

申请日：2004-08-23

申请人： Suvhasis Mukhopadhyay ,  Ramses Valvekens ,  Cedric Esqueret ,  Yudhisthira Kundu

发明人： Suvhasis Mukhopadhyay ,  Ramses Valvekens ,  Cedric Esqueret ,  Yudhisthira Kundu

IPC分类号： H04J3/06

CPC分类号： H04J3/0608 ,  H04J2203/0089

摘要： A SONET/SDH frame synchronization method uses one framing pattern to find the frame and a second framing pattern to monitor the frame after it is acquired. The first framing pattern uses twenty-four bits selected from the A1 and A2 bytes. After acquisition, the second framing, pattern uses only twelve bits, e.g. the last four bits of the last A1 byte and all of the first A2 byte. The framing pattern comparisons are made with a window of N+1 bytes or 2N bytes. The method of the invention meets the requirements of Telcordia GR-253 and eliminates aliasing in the last H2 bytes. The method can also be applied to enhanced framing in STS-192 and STS-768. An exemplary implementation of the method is realized in a state machine.

摘要翻译： SONET / SDH帧同步方法使用一个成帧模式来查找帧和第二帧模式以在获取帧之后监视该帧。 第一个成帧模式使用从A1和A2字节中选择的二十四位。 在采集之后，第二帧模式仅使用12位，例如 最后一个A1字节的最后四位和所有第一个A2字节。 使用N + 1字节或2N字节的窗口进行成帧模式比较。 本发明的方法满足Telcordia GR-253的要求，消除了最后H2字节的混叠。 该方法也可应用于STS-192和STS-768中的增强成帧。 该方法的示例性实现在状态机中实现。