Phaser 6180MFP Multifunction Printer Service Manual 2-101
Theory of Operation
Protocol Monitor
Overview of Communication Protocol
A protocol refers to an agreed-upon set of special rules to be adhered to by
endpoints attempting to establish a telecommunication connection.
The communication protocol for the G3 fax specifications is stipulated by an
international specification known as ITU-T Recommendation T.30
(page 2-105).
All G3 fax machines conform to this protocol when exchanging signal to
establish communication.
The G3 fax session consists of five phases from “Phase A” to “Phase E.”
■ Phase A – Call Establishment
■ Phase B – Capability Negotiations
■ Phase C – Image Data Transfer
■ Phase D – Post-transfer Procedure
■ Phase E – Call Release
The following flow chart provides a typical G3 fax session of a one-page
document.
Sending Fax Station Receiving Fax Station
s6180mfp-431
CNG
CED
NSF/CSI/DIS
(NSS)/TSI/DCS
TCF
CFR
EOP
MCF
DCN
Training Signal
PIX (Image Data)
Phase A
Phase B
Phase C
Phase D
Phase E
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