scope:

This ETS contains the technical characteristics required for end-to-end interworking over the Public Switched Telephone Network (PSTN). Clauses of this ETS also contain Category II specifications define for certain features which may be provided by some modems, but the requirements in these parts are only applicable when invoked by a modem specific ETS.

The term "modem" in the context of this ETS includes all physical implementation practices for voice band modems which are conductively connected to the PSTN.

NOTE: This implies that certain types of modems, e.g. acoustically coupled arid cordless modems, are outside the scope of this ETS.

This ETS also contains descriptions of the tests to be performed in order to confirm compliance with the functional requirements contained herein. A general description of the test conditions and test requirements for clause 4 is given in annex A (informative) and for clause 5 in annex B (normative).

Annex C (normative) descnbes the testing facilities which a testing laboratory may need to provide.

Annex D (normative) indicates additional equipment, or software, that applicants may need to provide in order that testing to Category II can be achieved.