SBC session border controllers 23
2.10 Safety instructions
General guidelines
Any operations with the equipment should comply to the Safety Rules for Operation of Customers' Electrical
Installations.
Operations with the equipment should be carried out only by personnel authorised in accordance
with the safety requirements.
Before operating the device, all engineers should undergo special training.
The device should be connected only to properly functioning supplementary equipment.
SBC can be permanently used provided the following requirements are met:
– Ambient temperature from 0 to +40°C.
– Relative humidity up to 80% at +25°C.
– Atmosphere pressure from 6.0х10*4 to 10.7х10*4 Pa (from 450 to 800 mm Hg).
The device should be not be exposed to mechanical shock, vibration, smoke, dust, water, and chemicals.
To avoid components overheating that may result in device malfunction, do not block air vents or place
objects on the equipment.
Electrical Safety Requirements
Prior to connecting the device to a power source, ensure that the equipment case is grounded with an earth
bonding point. The earthing wire should be securely connected to the earth bonding point. The resistance between
the protective earth terminal and the earth bus must not exceed 0.1 Ohms.
PC and measurement instruments should be grounded prior to connection to the device. The potential
difference between the equipment case and the cases of the instruments must not exceed 1 V.
Prior to turning the device on, ensure that all cables are undamaged and securely connected.
Make sure the device is off, when installing or removing the case.
Electrostatic discharge safety measures
In order to avoid failures caused by electrostatic discharge, we strongly recommend
– to wear ESD belt, shoes and wrist strap which prevent electrostatic charge accumulation (for wrist strap,
make sure that it has a secure fit against the skin) and connect the cable to earthing prior to operation.
Power supply requirements
2.10.4.1 Power supply type requirements
The power supply must be from a DC source with an earthed positive potential with a voltage of 48 V, or from
an AC remote power supply with a voltage of up to 220 V.
2.10.4.2 Permissible voltage variation requirements for DC power supply
The voltage of a 48 V power supply can vary between 40.5 V and 57 V.
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