System for redundancy in Ethernet passive optical networks (EPONs)
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United States of America Patent
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Apr 16, 2013
Issued Date -
N/A
app pub date -
Jan 31, 2010
filing date -
Jan 31, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A system for redundancy in Ethernet passive optical networks (EPONs) facilitates fast recovery from failure (less than 50 msec), path redundancy of the fiber optic network, and location redundancy of the OLTs. An optical networking unit (ONU) in a normal state monitors input communications, and when the input communications are quiet for a predetermined minimum length of time, the ONU transitions to a lenient state in which: the ONU accepts old and new security keys; upon receiving a packet: the ONU updates an ONU timestamp based on the packet's timestamp; and the ONU transitions to the normal state of operation. While the ONU is in the lenient state if a packet is not received for a predetermined given length of time the ONU transitions to a deregistered state. In this system, main and standby OLTs do not require synchronization of security parameters or synchronization for differences in fiber lengths.
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Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- H04B Class
- 2.93 % this patent is cited more than
- 12 Age
