Method and system for synchronizing a transceiver and a downstream device in an optical transmission network

• US 20040086278A1
• Filed: 12/27/2002
• Published: 05/06/2004
• Est. Priority Date: 11/01/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Chan, Tim, Oiu, Sheila, Jing, Hongtao, Proano, Jay
• Granted Patent: US 8,160,109 B2
• Time in Patent Office: Days
• US Class Current: 398/154
• CPC Class Codes: H04J 2203/0089 Multiplexing, e.g. coding, scrambling, SONET
• CPC Class Codes: H04J 3/04 Distributors combined with modulators or demodulators pulse distributors in general H03K5/15; pulse counters H03K21/00 - H03K29/06; for telegraphy H04L5/22, H04L13/00 - H04L23/00, H04L25/45; for telephony H04Q11/04
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation

Abstract

Aspects of the invention provide a method and system for synchronizing a transceiver and a framer in an optical transmission network. Subsequent to achieving synchronization of an inbound data stream, an internal framer may be adapted to inform a downstream device such as a full framer, that synchronization has already been attained. Accordingly, the downstream device may not need to perform resynchronization of the inbound data and can immediately start processing the inbound data. Advantageously, the internal framer may provide expedited error checking, handling and reporting prior to receipt of the data by the downstream device.

Claims

1. A method for synchronizing a transceiver with a downstream device in an optical transmission network, the method comprising:

acquiring synchronization with an inbound data stream by an internal framer of said transceiver;

notifying the downstream device of said acquired synchronization of said inbound data stream; and

receiving said inbound data stream by the downstream device for processing without synchronizing to said inbound data stream.

2. The method according to claim 1, wherein said acquiring synchronization further comprises:

locating a first frame within said inbound data stream containing a first synchronization pattern; and

locating a second frame having a synchronization pattern within said inbound data stream, said second frame being consecutive to said first located frame and only a portion of said synchronization pattern of said second frame is used to locate said synchronization pattern of said second frame.

3. The method according to claim 1, wherein said notifying further comprises communicating a signal via a conduit coupling said internal framer to the downstream device.

4. The method according to claim 3, wherein said conduit is one of an electrical conduit and an optical conduit.

5. The method according to claim 1, wherein said downstream device is a full framer.

6. The method according to claim 3, wherein said inbound data stream is formatted in accordance with a protocol selected from the group consisting of SONET, fibre channel and 10 gigabit Ethernet.

18. The system according to claim 3, wherein said inbound data stream is formatted in accordance with a protocol selected from the group consisting of SONET, fibre channel and 10 gigabit Ethernet.

7. A machine-readable storage, having stored thereon a computer program having at least one code section for synchronizing a transceiver with a downstream device in an optical transmission network, the code sections executable by a machine for causing the machine to perform the steps comprising:

acquiring synchronization with an inbound data stream by an internal framer of said transceiver;

notifying the downstream device of said acquired synchronization of said inbound data stream; and

receiving said inbound data stream by the downstream device for processing without synchronizing to said inbound data stream.

8. The machine-readable storage according to claim 7, wherein said acquiring synchronization further comprises:

locating a first frame within said inbound data stream containing a first synchronization pattern; and

locating a second frame having a synchronization pattern within said inbound data stream, said second frame being consecutive to said first located frame and only a portion of said synchronization pattern of said second frame is used to locate said synchronization pattern of said second frame.

9. The machine-readable storage according to claim 8, wherein said notifying further comprises at least one code section for communicating a signal via a conduit coupling said internal framer to the downstream device.

10. The machine-readable storage according to claim 9, wherein said conduit is one of an electrical conduit and an optical conduit.

11. The machine-readable storage according to claim 7, wherein said downstream device is a full framer.

12. The machine-readable storage according to claim 9, wherein said inbound data stream is formatted in accordance with a protocol selected from the group consisting of SONET, fibre channel and 10 gigabit Ethernet.

13. A system for synchronizing a transceiver with a downstream device in an optical transmission network, the system comprising:

a synchronizer for acquiring synchronization with an inbound data stream by an internal framer of said transceiver;

a notifier for notifying the downstream device of said acquired synchronization of said inbound data stream; and

a receiver for receiving said inbound data stream by the downstream device for processing without synchronizing to said inbound data stream.

14. The system according to claim 13, wherein said synchronizer further comprises:

at least one locator for locating a first frame within said inbound data stream containing a first synchronization pattern; and

said at least one locator locating a second frame having a synchronization pattern within said inbound data stream, said second frame being consecutive to said first located frame and only a portion of said synchronization pattern of said second frame is used to locate said synchronization pattern of said second frame.

15. The system according to claim 13, wherein said notifier further comprises a conduit coupling said internal framer and to the downstream device, said conduit communicating a signal from said internal framer to the downstream device.

16. The system according to claim 15, wherein said conduit is one of an electrical conduit and an optical conduit.

17. The system according to claim 13, wherein said downstream device is a full framer.