scope:

This ETS specifies the technical characteristics of equipment offering group 4 class 1 facsimile functions for attachment to the Integrated Services Digital Network (ISDN). It is based upon CCITT Recommendation T.563 [1], and CCITT Recommendation T.6 [2].

 A basic level of compatibility is provided between any two terminals, both nationally and internationally, so that they may communicate image-coded information to each other. This is to be achieved by requiring that terminals comply with ETSs 300 080 [3], 300 112 [4] and this ETS.

When there is a facsimile group 4 service, only facsimile equipment conforming to this specification may participate in the service. Facsimile equipment complying only to NET 3 can be connected to the ISDN, but may not participate in the service.

It is also permitted to connect group 4 class 1 facsimile equipment to the Telefax 4 Service via primary rate access (according to ETS 300 156). In this case, compliance with the B-channel requirements of ETS 300 080 [3] only (B-channel) is needed for group 4 class 1 facsimile equipment.

This ETS is related to 4 other ETSs on group 4 class 1 facsimile:

ETS 300 080 [3] "Integrated Services Digital Network (ISDN); ISDN lower layer protocols for telematic terminals".

ETS 300 112 [4] "Integrated Services Digital Network (ISDN); Facsimile group 4 class 1 equipment on the ISDN; End-to-end protocols".

prETS 300 155 "Facsimile group 4 class 1 equipment on the ISDN; End-to-end protocols tests (interconnection capability testing)".

ETS 300 280 "Integrated Services Digital Network (ISDN); Facsimile group 4 class 1 equipment on the ISDN, Terminal testing".