发明名称 |
METHOD AND APPARATUS FOR DIGITAL DATA SYNCHRONIZATION |
摘要 |
Synchronization and desynchronization of a data signal transported in a synchronous frame across a synchronous communications network, such as SONET/SDH, reduces waiting-time jitter. A timing estimate (F) indicative of a relationship between a data rate (f1) of the data signal and a reference frequency (f2) of the synchronous communications network is calculated and communicated through the synchronous communications network, for example in the Synchronous Payload Envelope of a SONET frame. The data signal is recovered using a desynchronizer Phase-Locked Loop steered by the timing estimate (F). The timing estimate (F) can be any one or more of: a ratio between the data rate (f1) and the reference frequency (f2); a difference between the data rate (f1) and the reference frequency (f2); and a phase difference between a recovered data clock signal associated with the data rate (f1) and a reference clock signal associated with the reference frequency (f2).
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申请公布号 |
CA2462902(C) |
申请公布日期 |
2011.09.27 |
申请号 |
CA20022462902 |
申请日期 |
2002.10.09 |
申请人 |
NORTEL NETWORKS LIMITED |
发明人 |
ROBERTS, KIM B.;GAGNON, RONALD J.;SHIELDS, JAMES A. |
分类号 |
H04J3/00;H04J3/06;H04J3/07;H04J3/16;H04L7/00;H04Q11/04 |
主分类号 |
H04J3/00 |
代理机构 |
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主权项 |
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地址 |
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