Xerox Phaser 6180MFP Service Manual page 185

Phaser 6180MFP Multifunction Printer Service Manual
MPS
When the image data has been successfully received, the receiving side
sends out Message Confirmation (MCF) to prompt for subsequent image data
transmission. When the received image data contains permissible errors, the
receiving data side responds with Retrain Positive (RTP). When unacceptable
errors are detected, the receiving side responds with Retrain Negative (RTN).
To a signal requesting operator intervention, the receiving side responds with
Procedural Interrupt Positive (PIP) when the image data has been received
successfully. When the image data contains unacceptable errors, the
receiving side responds with Procedural Interrupt Negative (PIN). When
retransmission is required in Error Correction Mode (ECM), the receiving side
responds with Partial Page Request (PPR).
ECM – A transmission method that manages the encoded data by
dividing it in units called frames and by numbering them. In the event
of image corruption due to noise, etc., image quality can be corrected
by retransmitting only the corrupted units specified by number.
Multiple frames form a unit called block. One block transmitted, or
multiple frames retransmitted are called partial page. To use ECM,
both the sending the receiving sides must have ECM feature.
Phase E – Call Release
This phase terminates the entire fax session and releases the line. Before
releasing the line, the sending side sends out Disconnect (DCN), which
expects no response.
Phase A
Phase B
Phase C
Phase D
EOP EOM
Phase E
s6180mfp-432
Theory of Operation
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