1 Service definition

3GPP43.045Release 17Technical realization of facsimile group 3 transparentTS

The fixed network Group 3 Facsimile service, as basically defined in ITU-T Recommendation F.160, is an international telematic service for ISO A4 document transmission between two facsimile stations.

The service specification is comprised of two parts: the control protocol described in ITU-T Recommendation T.30, and the document transmission coding described in ITU-T Recommendation T.4.

The facsimile Teleservice is intended to allow facsimile connections between group 3 apparatus using:

– a PLMN as a stand alone facility, for mobile to mobile communication;

– a PLMN to gain access to fixed networks PSTN and ISDN, for mobile to/from land communication.

For this Teleservice, the document coding is as ITU-T Recommendation T.4 with no modifications. The protocol used is ITU-T Recommendation T.30 modified within the PLMN as detailed in the present document.

The interworking between different networks is based on ITU-T Recommendation X.300.

The particular features of this Teleservice are:

– it uses point-point communication;

– the information transfer capability is dual "Speech"/"Group 3 Facsimile" for Teleservice 61 and "Group 3 Facsimile" only for Teleservice 62;

– both mobile originated and terminated calls are supported;

– the information transfer mode is circuit, duplex, synchronous and symmetric;

– different end-to-end transfer rates are used within the same call to take advantage of the better radio path error rate;

– use of a standard synchronous terminal adaptation function (as per 3GPP TS 27.003) within the MS.