3 Definition and abbreviations

23.1463GPPRelease 17Technical realization of facsimile Group 3 non-transparentTS

3.1 Definitions

For the purposes of the present document, the following terms and definitions apply:

E-T.38: to use E-T.38 between both the FAs across the radio interface. E-T.38 is based on ITU-T Recommendation T.38, but there are some differences with regards to the packet elements, transcoding methods, and the procedure of controlling signals. The same procedure as T.38 is used for the structure of the frame and the protocol stack (Refer to the following clause, annex A and T.38 for the details).

TAF: TAF usually shows a function of the UE side, but when IWF has the function that is equal to the UE side TAF, TAF is used to express the function of the IWF in the present document.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

AAL2 ATM Adaptation Layer type 2

ARQ Automatic Retransmission Request

BCS Binary coded signalling

CCT Circuit(s)

CD Data Call Direction

CDMA Code Division Multiple Access

CONTP Character Oriented Non‑Transparent Protocol

DTCH Dedicated Traffic Channel

E-T.38 Enhanced T.38

IE Information element

IFP Internet Fax Protocol

IP Internet Protocol

IWF Interworking Function

I/F Interface

L2RCOP Layer 2 Relay Character Oriented Protocol

MAC Medium Access Control (protocol layering context)

MMI Man-Machine Interface

MT Mobile Terminal

PPP Point to Point Protocol

PSTN Public Switched Telephone Network

RCSD Reverse Call Setup Direction

R-FA Reception side facsimile adaptor that does not have TAF capability

R-FAX Reception side facsimile

RLC Radio Link Control

RLP Radio Link Protocol

R-TAF Reception side terminal adaptation function

SREJ Selective reject

TAF Terminal Adapter Function

TE Terminal Equipment

T-FA Transmission side facsimile adaptor that does not have TAF capability

T-FAX Transmission side facsimile

T-TAF Transmission side terminal adaptation function

UE User Equipment

UDP User Datagram Protocol

UDPTL Facsimile UDP Transport Layer protocol

The abbreviations for the facsimile specific protocol elements and signals are listed in annex B.