Question 13/V - Unbalance of telephone installations
(Continuation of Question 13/V, 1985-1988; revised wording)
(See also Question 30/XII)

From the point of view of noise and other disturbances in
telecommunication systems due to interferences by electric power systems
and
HF-transmitters, is it necessary to specify values and measuring methods
of unbalance about earth for:

a) terminal and intermediate equipment?

b) telecommunication lines?

c) the line from subscriber to subscriber within a local network
including the exchange?

If so:

- Which frequency range should be considered?
Is it necessary to take into account in addition to the audio-
frequency-transmission, digital transmission and carrier frequency
systems on balanced lines.

-Which unbalance values should be recommended above the audio frequency
range?

-Which methods are suitable for unbalance measurements with regard to
the frequency range and to the transmission system?

-Which method is suitable and sufficient for reducing unbalance, to
achieve the necessary characteristics?

-Which is the statistical distribution of unbalance parameters of
equipment if manufactured in large quantities?

-What is the distribution of unbalance parameters statistical or uniform
along a telecommunication line which should be used for calculation of
transverse voltages?