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10.2.1 Protection against dangerous affects
The protection of the equipment against dangerous interfering affects meets the requirements of
ITU-U K20/K.21
10.2.2 Surge safety
Parameter Description Note
The resistance between the
ground terminal and isolated parts
of the device
≤ 0,1 Ohm
Insulation resistance of the device
electrical circuit
≥ 20 MOhm (normal climatic
conditions)
≥ 5 MOhm (high temperature)
≥ 1 MOhm (high humidity)
Test voltage for ungrounded
electrical circuit relative to the
case of the device
500 V (amplitude, normal
climatic conditions)
300 V (amplitude, high
humidity)
Test voltage of isolation of
electrical circuit, galvanically
disconnected with the ground
500 V (amplitude, normal
climatic conditions)
300 V (amplitude, high
humidity)
Without
discharge
within 1
minute
Test voltage of 50 Hz accepted by
the line interface
> 2000 V
rms
relative to
ungrounded device elements
> 1500 V
rms
relative to
grounded device elements
Within 2 s
10.3 10.3 Climatic conditions
The units are engineered to operate in the following climatic conditions:
• air temperature -5… +45°C;
• relative air humidity 95% at 25°C.
The equipment preserves all its characteristics at 450 Torr (60 KPa)
The storage conditions: -50…+50°C.
The equipment can withstand all means of transport (including airplanes), i.e. it withstands the
90-Torr (12 KPa) atmospheric pressure at -50°C.
Version: 1.0 Page. 82 of 95