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1. Technical description
1.1. General description.
The S108-CRB is dedicated for uninterruptible power supply of 8 IP cameras (52 V DC power supply) and
uninterruptible power supply of the DVR (12 V DC power supply).
The enclosure construction is compliant with the
requirements of the General Data Protection Regulation GDPR (the possibility of installing two locks with different
codes).
In addition, the large size of the enclosure allows installing the recorder inside.
The main elements of this system include:
- 10 ports PoE switch
- buffer power supply unit 27,6 V which can accommodate two 17 Ah / 12 V batteries
- a converter (DC/DC52230) increasing the voltage to 52 V DC (supply of the PoE switch)
- step down (DC/DC50SD) converter with adjustable output voltage to 12 V DC (DVR power supply)
In case of power decay, a battery back-up is activated immediately.
The approximate backup time is given assuming that all output ports are used (using typical devices and 17 Ah
batteries). The electricity consumption for own needs and the energy efficiency of the power intake track were taken into
account. The exact description of how to perform the calculations can be found at:
"Approximate backup time - assumptions for
Automatic detection of any devices powered in the PoE/PoE+ standard is enabled at the 1 - 8 ports of the switch.
The Up Link ports is used for connection of another network device e.g. recorder. The LEDs at the front panel indicate the
operation status (described in the table below).
The switch is housed in a metal enclosure (color RAL 9003) which can accommodate a two 17 Ah/12 V batteries. The enclosure
features a micro switch tamper indicating door opening (front panel). The S108-CRB is fitted with two LEDs on the front panel
(red LED - indicates the presence of 230 V supply voltage, green LED indicates the presence of DC voltage).
The PoE technology ensures a network connection and reduces installation costs by eliminating the need to supply a
separate power cable for each device. This method allows supplying other network devices, such as IP phone, wireless
access point or router.
1.2 Block diagram.
Fig. 1. Block diagram.
