Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2008-07-22
2008-07-22
Qureshi, Afsar (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S512000, C725S144000, C348S521000
Reexamination Certificate
active
11182535
ABSTRACT:
The clocks of one or more edgeQAM devices are synchronized with a master clock at the remotely located CMTS. A master clock signal may be transmitted via a dedicated gigabit Ethernet link. Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators that drive local clocks at respective edgeQAM devices.In another embodiment, the downstream sample rate to particular edgeQAM devices may be sampled and used to lock a local clock at respective canary modems dedicated to each edgeQAM device. A canary modem's clock is compared to the master clock, and a resulting phase error is communicated to the respective edgeQAM device for use in adjusting its local clock. Or, TDMA upstream ranging burst average trends are used to estimate edgeQAM clock error. Each respective edgeQAM uses this error to adjust its clock.
REFERENCES:
patent: 2003/0200548 (2003-10-01), Baran et al.
Downey Denis
Hamington Michael
Kharkunou Yury
O'Keeffe Frank
Volkov Alex
Arris International, Inc.
Doughty John
Qureshi Afsar
LandOfFree
Method and system for synchronizing separated edge QAM... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for synchronizing separated edge QAM..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for synchronizing separated edge QAM... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3920494