Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-01-30
2001-04-17
Le, Thanh Cong (Department: 2684)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S517000, C455S557000
Reexamination Certificate
active
06219558
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a facsimile communication system, and more particularly, to a polling communication system between a facsimile machine having a polling function and a facsimile machine not having a polling function.
2. Description of the Related Art
Generally, in a facsimile communication system, it is impossible to carry out a polling communication from a facsimile machine having a polling function to a facsimile machine having no polling function. This will be explained later in detail.
If an additional function for determining whether or not a digital identification signal showing the presence of data to be transmitted is received is provided in the facsimile machine having no polling machine, this facsimile machine can receive polling-transmitted data (see JP-A-1-120959 & JP-A-7-131624); however, in this case, the manufacturing cost of the facsimile machine having no polling function is increased.
SUMMARY OF THE INVENTION
It is an object of the present invention to carry out a polling communication with a facsimile machine having no polling function without changing the facsimile machine.
According to the present invention, in a facsimile communication system including a first adapter connected to a first facsimile machine having a polling function and a second adapter connected to a second facsimile machine, wherein, only when the first adapter receives digital identification signals from both of the first and second facsimile machines within a predetermined time period, does the first adapter generate a digital transmit signal and transmit it to the first facsimile machine so that a polling communication is carried out from the first facsimile machine to the second facsimile machine.
A special function is provided in the first adapter without changing the second facsimile machine.
REFERENCES:
patent: 5070536 (1991-12-01), Mahany et al.
patent: 5752199 (1998-05-01), Scott
patent: 5805301 (1998-09-01), Rasanen
patent: 1-120959 (1989-05-01), None
patent: 7-131624 (1995-05-01), None
Cong Le Thanh
Foley & Lardner
NEC Corporation
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