1 Principle structure of an element

03.463GPPTechnical Realization of Facsimile Group 3 Service - non transparentTS

Each FA protocol element consists of the element discriminator (one single octet) and the optional information field (arbitrary length).

The elements are transmitted with octet 0, bit 1 first. Received information is forwarded with the same bit sequence as received.

octet: 0 1 ….. n
┌───────────────┬────────────────────────────────────────────┐
│ Element │ CCITT Recommendation T.30 Protocol Element │
│ Discriminator │ (optional) │
└───────────────┴────────────────────────────────────────────┘
│<– 1 octet –>│<————— n octets —————–>│

Figure A.1/03.46: Principle FA protocol element structure