Question 3/XVII - Modems for the transmission of data and other digital
signals on the General Switched Telephone Network (GSTN) and on two-
wire telephone-type leased circuits
(Continuation of Question 3/XVII, 1985-1988: revised wording)
(Concerns Study Group VIII)

1. Study of modems for signalling rates above 9600 bit/s including the
study of what performance advantage might be achieved through different
modes of operation (e.g. duplex, asymmetrical duplex, and half duplex).

2. Study of the characteristics, other than error control, needed by
modems to be used on cellular radio services.

3. Study of modems for the simultaneous transmission of voice and data
signals.

4. Study of points arising from the implementation of existing V-Series
modems for use on the General Switched Telephone Network (GSTN) and on
two-wire telephone-type leased circuits.

Note - With the development of new modem technology the measuring
methods for test parameters and the relevant performance parameters
shall be studied in accordance with the updating of Recommendation V.56.