Dell 3115CN - Page 55

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Chapter 1 Troubleshooting
Version 1 2006.11.21
3.5 Understanding Protocol Monitor
3.5.1 Overview of Communication Protocol
In the context of information technology, 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.
All G3 fax machines conform to this protocol when exchanging signals to establish a communication.
Outlined below is the flow of a typical G3 fax session of a one-page document.
The entire G3 fax session consists of the following 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
G3 Fax Session
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