24
SBC session border controllers
When the power supply voltage is restored after being below the permissible threshold, the device
specifications will be restored automatically.
2.10.4.3
Permissible interference requirements for DC power supply
The equipment must function properly with power supply interference not exceeding that shown in Table 15.
Table 15 — Permissible interference requirements for DC power supply
Interference type
Value
Permissible voltage deviation from rated value, %
duration 50 ms
duration 5 ms
-20
40
Harmonical component voltage ripple, mV eff.
up to 300 Hz
from 300 Hz to 150 kHz
50
7
2.10.4.4
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 the
values listed in Table
Table 16 — Requirements to interference produced by equipment in power supply circuit
Interference type
Value
Total interference in the range of 25 Hz to 150 Hz, mV eff.
50
Selective interference in the range of 300 Hz to 150 kHz, mV eff.
7
Weighted (psophometric) interference, mV psoph.
2
2.10.4.5
AC power supply requirements
AC power supply parameters should be as follows:
–
Maximum allowed voltage — 220 V.
–
Power supply should feature residual current device (RCD).
–
Insulation strength of AC power supply circuits against the housing should withstand at least 1000 V peak
(in normal conditions).
2.11
SBC 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.
If the device was exposed to low temperatures for a long time before installation, leave it for 2 hours at ambient
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 a 19" rack using the mounting set or mounted to
the horizontally oriented perforated shelf.
Ground the case of the device after installation. This should be done prior to connecting the device to the
power supply. An insulated multiconductor wire should be used for earthing. The device grounding and the earthing
wire section should comply with Electric Installation Code. The earth bonding point is located at the right bottom
corner of the rear panel, see Figures
