NEC Electra Elite IPK II Features And Specifications Manual page 955

Electra Elite IPK II
With a Global IP Address, connected equipment can be accessed through the internet, so each address
must be unique. To avoid a conflict, the addresses are controlled by ARIN (American Registry for
Internet Numbers). To obtain a Global IP Address, contact ARIN or apply with your local ISP (internet
service provider).
The first one to three groups of numbers (depending on the subnet mask) identify the network on which
your computer is located. The remaining group(s) of numbers identify your computer on that network.
Subnet Mask
As the IP Address includes information to identify both the network and the final destination, the Subnet
Mask is used to set apart the network and destination information.
The default subnet masks are:
In the above table, you'll see that the Subnet Mask is made up of four groups of numbers. When a group
contains the number '255', this is telling the router to ignore or mask that group of numbers in the IP
address as it is defining the network location of the final destination. So, for example, if the IP Address
were: 172.16.0.10 and the Subnet Mask used was Class B (255.255.0.0), the first two groups of
numbers (172.16) would be ignored once they reached the proper network location. The next two groups
(0.10) would be the final destination within the LAN to which the connection is to be made.
DHCP
DHCP (Dynamic Host Configuration Protocol) is a protocol which assigns a dynamic IP Address.
Network control may be easier with DHCP as there is no need to assign and program individual IP
Addresses for the LAN equipment. To use a dynamic IP Address, a DHCP server must be provided. The
Electra Elite IPK II system provides the ability to use DHCP.
When equipment which is connected to the LAN (the DHCP client) is requesting an IP Address, it
searches the DHCP server. When the request for an address is recognized, the DHCP server assigns
an IP Address, Subnet definition, and the IP Address of the router, etc., based upon the system
programming.

The IPK II CPUII must always have a static IP address. This address is set in Program 10-12-01 : CPUII
Network Setup - IP Address (default: 172.16.0.10).
Voice Over Internet Protocol (VoIP)
Class Default Subnet Mask
A
B
C
255.0.0.0
255.255.0.0
255.255.255.0
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