Fermax PBX EA, User And Installation Manual

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IP address is a number, which clearly identifies a network interface in the
computer network, which uses IP protocol
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DHCP (Dynamic Host Configuration Protocol) is an application protocol from
the family of TCP/IP. It is used for automatic assigning of IP addresses to
individual personal computers in the PC networks, thus simplyfing their
administration
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Internet is a word-wide system of mutually connected computer networks
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Intranet is a computer network similar to Internet, but it is a private one.
That means it is just used for small user groups (e.g. employees of a company
).
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PoE (Power over Ethernet) is powering via data network cable, with no need
of bringing the power supply via a separate cable
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NTP (Network Time Protocol) is a protocol for synchronisation of internal
computer clock