System, method, and computer program product for fiber access

Details System, method, and computer program product for fiber access System, method, and computer program product for fiber access

2007-08-13

2010-10-19

Abelson, Ronald (Department: 2476)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S469000, C370S350000, C370S324000, C370S503000

Reexamination Certificate

active

07817676

ABSTRACT:
A system, method, and computer program product for synchronizing time between a centralized controller device and at least one subscriber device on a fiber access network. The control layer of a network device is expanded, and additional messaging control is added via the transmission of data 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.

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