ZKTeco White LCD Series, Руководство пользователя

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12. Appendix
wires to each network device. WAPs and security cameras can be
installed without the additional expense of contracting an electrician to
install AC outlets where deployed. PoE also helps protect IT
investments as it is forward and backward compatible with other
Ethernet protocols. Furthermore, PoE devices that are Simple Network
Management Protocol (SNMP) manageable can be remotely monitored
and controlled to efficiently manage or troubleshoot power consumption
and/or failures.
More flexible:
Network devices can be installed and re-located where
performance is optimum and not tethered to an existing AC outlet. This
is especially important for devices like WAPs, which may be installed in
hard to reach places like the ceiling in order to achieve the broadest
coverage.
More reliable:
A SNMP manageable centralized power source enhances
the protection against power overloads, outages, surges and spikes.
When PoE is implemented, along with uninterruptible power supplies
(UPSs) or battery backups, it allows enterprises to distribute power even
when the AC electrical power is down. This enables them to replace
conventional telephones with feature rich VoIP phones while retaining
the lifeline reliability benefits.
Backup Battery
It is important to ensure the fingerprint device power supply under any
circumstance, therefore besides of the standard adopter we provide, we
also prepare the special 5V Mini-UPS, according to your actual need to
purchase it, to extent possibility, help alleviate this problem of the power
supply that cause the fingerprint device down.
Work principle
In normal state, the reserve battery is idle state, the fingerprint device
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