SMG Digital Gateway
33
1.11.4.3
Permissible interference requirements for DC power supply
The equipment should operate normally, when the power supply interference is below the values listed in
the table below.
Table 13 — Permissible interference requirements for DC power supply
Interference type
Value
Permissible voltage deviation from rated value, %
Duration 50ms
Duration 5ms
20
40
Harmonical component voltage ripple, mV eff.
up to 300Hz
300Hz to 150kHz
50
7
1.11.4.4
Requirements to interference produced by equipment in power supply circuit
Voltage values of interference produced by the equipment in the power supply circuit should not exceed
values listed in Table below.
Table 14 — Requirements to interference produced by equipment in power supply circuit
Interference type
Value
Total interference in the range of 25Hz to 150Hz, mV eff.
50
Selective interference in the range of 300Hz to 150kHz, mV eff.
7
Weighted (psophometric) interference, mV psoph.
2
1.11.4.5
AC power supply requirements
AC power supply parameters should be as follows:
Maximum allowed voltage — 220V max.
Power supply should feature residual current device (RCD).
Insulation strength of AC power supply circuits against the housing should withstand at least
1000V peak (in normal conditions).
1.12
SMG Installation
Check the device for visible mechanical damage before installing and turning it on. In case of any damage,
stop the installation, fill in a corresponding document and contact your supplier.
The device should be installed on premises with access restricted only to service personnel.
If the device was exposed to low temperatures for a long time before installation, leave it for 2 hours at
room temperature prior to operation. If the device was exposed to high humidity for a long time, leave it for at
least 12 hours in normal conditions prior to turning it on.
Mount the device. The device is intended to be installed into 19" rack using the mounting set or mounted
on the horizontally oriented perforated shelf.
