Facsimile and static presentation processing – Static presentation processing – Data corruption – power interruption – or print prevention
Patent
1997-08-25
2000-03-07
Powell, Mark R.
Facsimile and static presentation processing
Static presentation processing
Data corruption, power interruption, or print prevention
3582611, 3582612, 3582614, 345118, 348180, 348404, 348384, 348420, 348441, 348596, 348739, G06F 100
Patent
active
060347821
ABSTRACT:
A cable test application is run in the host computer to determine whether the PC to printer connection is able to maintain at least a predetermined speed of data transfer. The cable test provides an accurate measure of the true throughput of the I/O connection during a print job, for example by sending special blocks of data, each tagged so that it is recognizable by the printer firmware's formatter as a "speed test block" that may be discarded after it has been processed, not only by the printer firmware's I/O process, but also by the downstream formatter process. This provides a more accurate measure of data transmission speed than simply having the I/O process throw away not yet formatted test data, and does not require the waste or spoilage of any print media or other expendable supplies. If the cable test indicates that the data transmission speed is not adequate to guarantee that a print job will always arrive in the time required (for example, because an ECP port's advanced capabilities have not been enabled), the data is preferably compressed before transmission to a level sufficient to accommodate the maximum design throughput of the printer. If the communication channel is not able to provide data transmission speed for which the printer was designed, the adverse consequences of the compression will be more than outweighed by the improvement throughput and the avoidance of artifacts caused by erratic carriage motion resulting from erratic receipt of data.
REFERENCES:
patent: 4851998 (1989-07-01), Hospodor
patent: 5519438 (1996-05-01), Elliott et al.
patent: 5533175 (1996-07-01), Lung et al.
patent: 5680521 (1997-10-01), Pardo et al.
Hewlett--Packard Company
Powell Mark R.
Sealey Lance W.
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