System, method, and computer program product for...

Details System, method, and computer program product for... System, method, and computer program product for...

2007-08-21

2007-08-21

Pham, Chi (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S469000, C370S350000, C370S324000

Reexamination Certificate

active

10224474

ABSTRACT:
A system, method, and computer program product for synchronizing time between a centralized controller device and at least one subscriber device on an Ethernet Passive Optical Network (EPON). The MAC control layer of an EPON device is expanded, and additional messaging control is added via the transmission of Ethernet frames. The expansion prevents reliance on a physical layer signal. The time synchronization also allows a time stamp to be incorporated into a message. Thus, bandwidth is not wasted by simply transmitting a time stamp by itself. In an embodiment, the centralized controller device measures the time difference between the time at which a particular ranging request is transmitted and the time at which the particular ranging request is received. The time difference represents the time adjustment value for the particular subscriber device and allows the device to synchronize its time with that of the centralized controller device.

REFERENCES:
patent: 4380063 (1983-04-01), Janson et al.
patent: 4887266 (1989-12-01), Neve et al.
patent: 4922414 (1990-05-01), Holloway et al.
patent: 5469283 (1995-11-01), Vinel et al.
patent: 5604742 (1997-02-01), Colmant et al.
patent: 5659615 (1997-08-01), Dillon
patent: 5864415 (1999-01-01), Williams et al.
patent: 6430408 (2002-08-01), Dorenbosch
patent: 6456590 (2002-09-01), Ren et al.
patent: 6473694 (2002-10-01), Akopian et al.
patent: 6724725 (2004-04-01), Dreyer et al.
patent: 6836851 (2004-12-01), Dive
patent: 2003/0193896 (2003-10-01), De Groote et al.
International Search Report for International Application No. PCT/US02/26512, International Filing Date: Aug. 21, 2002.

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