H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/437 (2006.01) H04B 10/20 (2006.01) H04J 3/08 (2006.01) H04L 12/42 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2317907
The present invention relates to a local node for use in a synchronous optical network ring. The local node includes a group of working transmission lines and a protection line, for connecting to a remote node. The local node further includes a control unit for monitoring the working transmission lines and, upon detection of a data transmission impairment over a particular working transmission line, invoking a protection switch event causing re-routing of optical signals from the particular working transmission line to the protection line. Should the control unit detect simultaneous data transmission impairments over two or more working transmission lines, the control unit will choose to protect a particular working transmission line on the basis of a user-defined priority scheme. 33
de Boer Evert
Olajubu Joseph
Pare Louis R.
Phelps Peter William
Ryan Darryl C.
Borden Ladner Gervais Llp
Nortel Networks Corporation
Nortel Networks Limited
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