DXP HD 4K PLUS Series • Reference Information 109
Subnetting, a Primer
A subnet is a subset of a network — a set of IP devices that have portions of their IP
addresses in common. It is not the purpose of this manual to describe TCP/IP protocol
in detail. However, some understanding of TCP/IP subnetting is necessary in order to
understand the interaction of the DXP switcher and the mail server gateway. To understand
subnetting at the level required to install and operate the DXP switcher, you must
understand the concepts of a gateway, local and remote devices, IP addresses and octets,
and subnet masks and octets.
Gateways
The DXP switcher can communicate with the e-mail server that it uses for e-mail notification
directly (if they are on the same subnet), or the communication can be routed via a gateway
(a computer that provides a link between different subnets).
IP addresses and octets
Valid IP addresses consist of four 1-, 2-, or 3-digit numeric sub-fields, called “octets,” which
are separated by dots (see figure 69). Each octet can be numbered from 000 through 255.
Leading zeros, up to three digits total per octet, are optional. Values of 256 and above are
invalid.
192.168.254.254
ypical IP Address:
Octets
Figure 69. IP Address and Octets
Subnet masks and octets
The subnet mask (see figure 70) is used to determine whether the local and remote devices
are on the same subnet or different subnets. The subnet mask consists of four numeric
octets separated by dots. Each octet can be numbered from 000 through 255. Leading
zeros, up to three digits total per octet, are optional. Each octet typically contains either 255
or 0. The octets determine whether or not the same octets of two IP addresses should be
compared when determining if two devices are on the same subnet.
255.255.0.0Typical Subnet Mask:
Octets
255 indicates that this octet is
ed between two IP addresses.
0 indicates that this octet is not
compared between two IP addr
Figure 70. Subnet Mask and Octets
69
70
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