According to ITU-T Recommendation V. 34, the origination modem and the destination modem implement an original negotiation for determining a transmission rate of facsimile communication by executing a training independent of any controller. If the line therebetween is disconnected due to a communication error without establishment of the negotiation, the communication management information storage RAM 13 stores the communication management information. Thereafter, the CPU 11 eliminates the negotiation peculiar to the modems pursuant to V. 34 for redialing. The CPU 11 performs a negotiation for controlling the modems and selects a transmission mode corresponding to a communication capability of the destination facsimile based upon Recommendations V. 17, V. 29, and V. 27 ter.
Facsimile communication is correctly performed even when an echo is generated in a communication line having a delay, by handling an echo signal in such a manner that when an echo of a CFR signal (according to the ITU-T recommendation V.21) transmitted from a receiving communication apparatus is received by the receiving communication apparatus, the echo signal is not recognized as a carrier of a picture signal and training data is not adjusted on the basis of the received echo signal, thereby making it possible to receive a correct short training/picture signal which arrives thereafter. A facsimile communication procedure includes storing training information when long training information is received, detecting success in receiving short training information, detecting high-speed data, setting the stored training information into the modem, and changing the receiving operation in response to detection of short training information and high speed data.
A method of establishing a fax connection on a link which is a portion of a composite connection. The method includes transmitting at least some signals of a negotiation procedure on the link and initiating a retrain on the connection, without identifying a problem on the connection of the link, the retrain being initiated after transmitting the at least some signals of the negotiation procedure but before transmitting data on the data channel of the link due to the negotiation procedure.
Automated facsimile monitoring methods, systems, and computer program products can track response data from multiple facsimiles sent to different locations and generate electronically accessible failure reports to allow for error or faults to be tracked and assessed to thereby allow corrective action to be initiated in a more timely manner.
This invention is to provide a facsimile communication apparatus and method in which when a receiver which supports V.34 communication receives a call, transmits an ANSam signal, and receives a CM signal indicating V.17 communication from the transmitter, V.17 communication can reliably be established. A facsimile communication apparatus for executing a protocol defined in ITU-T recommendation V.8 with respect to a partner apparatus and setting an image transmission mode executable with respect to the partner apparatus on the basis of the protocol includes an ANSam signal transmission unit, a CM signal reception units, and a control unit for, when a CM signal indicating V.17 communication is received after transmission of an ANSam signal, executing control so as not to respond to the CM signal.
