Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2007-04-03
2007-04-03
Pham, Chi (Department: 2616)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S354000, C370S355000, C370S357000, C370S371000, C370S372000, C370S373000, C370S374000, C370S376000, C370S503000, C370S507000, C370S509000, C370S518000, C370S520000
Reexamination Certificate
active
10047758
ABSTRACT:
An integrated services digital network private branch exchange, which is capable of automatically choosing a synchronization clock source. The integrated services digital network private branch exchange comprises a plurality of trunk chips, a plurality of subscribe chips, and a plurality of priority selection circuits. Wherein, the trunk chips connect to the network terminal via the trunk interface, and then connect to the central office via the network terminal to receive the frame synchronization clock output signal and the data clock output signal. Whereas, the subscribe chips connect to the terminal equipment via the subscribe interface. The priority selection circuits that are connected to each other in a daisy chain circuit manner are connected to the trunk chips to send out the frame synchronization clock output signal and the data clock output signal.
REFERENCES:
patent: 4841551 (1989-06-01), Avaneas
patent: 2002/0038435 (2002-03-01), Akamatsu et al.
J.C. Patents
Jain Raj K.
Pham Chi
Winbond Electronics Corp.
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