Private branch exchange and private branch exchange control...

Details Private branch exchange and private branch exchange control... Private branch exchange and private branch exchange control...

2007-10-30

2007-10-30

Tran, Quoc (Department: 2614)

Telephonic communications

Multi-line or key substation system with selective switching...

Detail of line circuit or line card

C379S165000, C379S112020, C379S221030

Reexamination Certificate

active

10466497

ABSTRACT:
A private branch exchange changes the load distribution according to the use condition by a main control unit and a sub-control unit. A line card comprises a first module group normally carrying out various operations in response to an instruction of the sub-control unit, a second module group carrying out various operations in response to the sub-control unit or the main control unit, a bus arbitration circuit, and an internal module bus selecting unit having a bypass selector for bypassing the bus arbitration circuit. The main control unit predicts the load on a system at the start of the system from the information stored in the incorporated line card, and determines, considering the prediction result, whether the control is made by the sub-control unit or the main control unit, for each module of each line card.

REFERENCES:
patent: 4736409 (1988-04-01), Hasegawa et al.
patent: 6452946 (2002-09-01), Manzardo
patent: 6563922 (2003-05-01), Weir
patent: 2006/0007946 (2006-01-01), Kastenholz et al.
patent: 5-344209 (1993-12-01), None
patent: 10-13878 (1998-01-01), None
patent: 2000-307722 (2000-11-01), None
patent: 2001-325212 (2001-11-01), None
International Search Report for PCT Application No. PCT/JP02/00031 dated Feb. 12, 2002.
Form PCT/ISA/210 English Translation.

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