Question 19/V - Conducted radio frequency interference on
telecommunication equipment and systems
(Continuation of Question 19/V, 1985-1988; revised title and wording)

The purpose of this Question is to establish Recommendation(s) on the
subject of conducted radio frequency interference on telecommunications
equipment and systems. Guidelines on improving the design of
telecommunication line and equipment along with advice on precautionary
measures shall be developed. Both emission and immunity aspects are to
be studied.

All types of conducted radio frequency interference should be covered,
including continuous wave and high frequency impulsive noise, except
those covered by Questions 13, 15, and 16/V.

The questions are:

i) Measurement method

- what parameters of conducted radio frequency interference
voltage on telecommunication lines at a frequency above
30 MHz should be measured?

-what procedure should be used to measure this type of interference?

ii) Immunity test

-what levels of conducted radio frequency interference in
telecommunication lines should equipment or systems be immune to?

-what testing procedure should be used?

-what kinds of protection method can efficiently improve immunity of
telecom equipment or systems?

iii) Updating Recommendation K.18

-what calculating method should be added to
Recommendation K.18 to evaluate induced noise voltage on subscriber
circuits due to radio broadcast waves.

iv) Conducted emmision

-is there any disturbance to other telecommunication systems or radio
receivers caused by emissions from telecommunication lines?

If so, what guidelines on emission control factors should be
established?

Note 1 - This Question is to be studied in liaison with CISPR/SCG,
IEC/TC77 and CCIR/Study Group 1, and CCITT Study Groups XI, XII, XV and
XVIII to establish effective standard.

Note 2 - Longitudinal conversion loss to telecommunication lines, which
is one of the emission control factors, should be studied in connection
with
Question 13/V.