Enhanced holdover for synchronous networks employing packet...

Details Enhanced holdover for synchronous networks employing packet... Enhanced holdover for synchronous networks employing packet...

2006-04-12

2009-10-20

Trinh, Tan (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Panoramic display

C455S075000, C455S148000, C455S146000, C455S502000

Reexamination Certificate

active

07606541

ABSTRACT:
Systems and methods are disclosed to maintain synchronous communications that uses a global positioning system satellite, a primary communication unit, and a secondary communication unit. The satellite based time reference broadcasts a reference signal to the primary communication unit and the secondary communication unit. The primary communication unit contains a high quality oscillator, and operates a virtual model of a secondary oscillator which is located in the secondary communication unit. The primary and secondary units have synchronous communications with each other by using a global positioning system satellite broadcast as a reference signal. If the secondary unit loses its signal from the global positioning system, the secondary oscillator enters a holdover state and transmits a notification of the holdover state to the primary communications unit. The primary communication unit then transmits time insensitive synchronization data based upon the virtual model through the packet switched network to the secondary communications unit to maintain synchronization.

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