Patent US4581937A successfully refreshed from Google Patents.
Patent EP0724355A2 successfully refreshed from Google Patents.
EP0724355A2
Expired / Lapsed
EP
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Data communication apparatus
Assignee: Canon Inc
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Filing: 1996-01-24
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Granted: —
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Expires: 2016-01-24
Abstract
Abstract When a protocol signal by a full duplex communication is transmitted and received, an error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When an acknowledge signal is not received within a predetermined period from the start of the sending of the protocol signal by a modem to a destination station, a control circuit switches the protocol from the execution of the V.8 or V.34 protocol by the full duplex communication to the execution of the V.21 protocol of the T.30 and continues the image communication. Further, when the protocol signal is transmitted and received by the full duplex communication, the error termination due to the disabling of the full duplex communication in the course of the communication is minimized. When the acknowledge signal is not received within the predetermined period from the start of the sending of the protocol signal to the destination station, the execution of the V.8 or V.34 protocol by the full duplex communication is terminated in error and the image communication is executed at redialing by the V.21 protocol of the T.30.
Inventors
- 👤 Takehiro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:55
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/333; H04N1/33346; H04N1/32609; H04N1/32614; H04N1/32619; H04N1/33307; H04N1/33323; H04N1/33361; H04N1/33369; H04N2201/00; H04N2201/32; H04N2201/333; H04N2201/33307; H04N2201/33342; H04N2201/3335; H04N2201/33364
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
A data communication apparatus for transmitting and receiving a protocol signal by a full duplex communication comprising: half duplex protocol execution means for transmitting and receiving the protocol signal by a half duplex communication; detection means for detecting, during the communication, whether the execution by the full duplex communication is permitted or not; and means for switching from the execution of the protocol by the full duplex communication to the execution of the protocol by the half duplex communication when the execution of the protocol by the full duplex communication is not permitted in the course of the communication.
Claim 2
Dependent Claim
43 words
A data communication apparatus according to Claim 1 wherein said detection means detects whether an acknowledge signal for the protocol signal is received within a predetermined period from the start of the sending of the protocol signal to the destination station or not.
Claim 3
Dependent Claim
40 words
A data communication apparatus according to Claim 1 wherein the protocol by the full duplex communication is the V.8 protocol or the V.34 protocol, and the protocol by the half duplex communication is a protocol in accordance with the T.30.
Claim 4
Dependent Claim
81 words
A data communication apparatus according to Claim 1 wherein a protocol for registering whether the full duplex protocol operation is permitted or not is provided for the destination station, and when the execution of the protocol by the full duplex communication is not permitted and the protocol by the half duplex communication is executed, it is registered and a predetermined number of times of subsequent communication to the same destination station are executed by the protocol by the half duplex communication.
Claim 5
Dependent Claim
44 words
A data communication apparatus according to Claim 1 wherein the protocol by the full duplex communication is the V.8 protocol or the V.34 protocol, and said half duplex protocol execution means executes the V.8 protocol or the V.34 protocol by the half duplex communication.
Claim 6
Dependent Claim
87 words
A data communication apparatus for transmitting and receiving a protocol signal by a full duplex communication comprising: half duplex protocol execution means for transmitting and receiving the protocol signal by a half duplex communication; discrimination means for determining whether the execution of the protocol by the full duplex communication is permitted or not; and means for selecting the start of the protocol by the full duplex communication or the start of the protocol by the half duplex communication in accordance with the determination by said discrimination means.
Claim 7
Dependent Claim
68 words
A data communication apparatus according to Claim 6 further comprising: detection means for detecting the occurrence of communication error in the protocol by the full duplex communication; setting means adapted to be set to avoid the protocol by the full duplex communication in accordance with the content of the communication error detected by said detection means; and said discrimination means determining the set state of said setting means.
Claim 8
Dependent Claim
43 words
A data communication apparatus according to Claim 7 wherein when the communication error indicates that a possibility to success in the protocol by the full duplex communication is low, said setting means is set to avoid the execution of the full duplex communication.
Claim 9
Dependent Claim
36 words
A data communication apparatus according to Claim 7 wherein said selection means selects the protocol by the full duplex communication or the protocol by the half duplex communication at the start of the communication by redialing.
Claim 10
Dependent Claim
37 words
A data communication apparatus according to Claim 6 further comprising: setting means adapted to be set to avoid the protocol by the full duplex communication; and said discrimination means determining the set state of said setting means.
Claim 11
Dependent Claim
18 words
A data communication apparatus according to Claim 10 wherein said setting means is set by a manual entry.
Claim 12
Dependent Claim
20 words
A data communication apparatus according to Claim 10 wherein said setting means is set in accordance with the communication destination.
Claim 13
Dependent Claim
31 words
A data communication apparatus according to Claim 12 further comprising display means for displaying information on a success ratio of the protocol by the full duplex communication for the communication destination.
Claim 14
Dependent Claim
40 words
A data communication apparatus according to Claim 6 wherein the protocol by the full duplex communication is the V.8 protocol or the V.34 protocol and the protocol by the half duplex communication is a protocol in accordance with the T.30.
References Cited (Backward Citations)
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