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Quit
Exit the Telnet utility by typing quit and then pressing <Enter> at the Telnet prompt. If you
are connected to the FOX matrix switcher, access the Telnet prompt by typing the Escape
character (<Ctrl>+<]>).
Subnetting — A Primer
It is not the purpose of this guide to describe TCP/IP protocol in detail. However, some
understanding of TCP/IP subnetting (a subnet is a subset of a network — a set of IP devices
that have portions of their IP addresses in common) is necessary in order to understand
the interaction of the FOX matrix switcher and the mail server gateway. To understand
subnetting at the level required to install and operate the FOX matrix switcher, you must
understand the concepts of a gateway, local and remote devices, IP addresses and octets,
and subnet masks and octets.
Gateways
The FOX matrix switcher can communicate with the e‑mail server that the switcher 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).
Local and Remote Devices
The local and remote devices are defined from the point of view of the function being
described. In this guide, subnetting is an issue when you are using the controlling PC to set
TCP/IP and e‑mail values in the matrix switcher (see IP Settings/Options Window on
page 76 and Email Settings Page on page 101). When you are setting up the variables
for e‑mail notification, which may include subnetting, the matrix switcher is the local device
and the e‑mail server is the remote device.
IP Addresses and Octets
Valid IP addresses consist of four 1‑, 2‑, or 3‑digit numeric subfields, properly called
“octets,” separated by dots (periods) (see figure 74). Each octet can be numbered from 000
through 255. Leading zeroes, up to three digits total per octet, are optional. Values of 256
and above are invalid.
192.168.254.254Typical IP Address:
Octets
Figure 74. Typical IP Address
Subnet Masks and Octets
The subnet mask (see figure 75) 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
zeroes, 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 will be
compared when determining if two devices are on the same subnet.
255.255.0.0Typical Subnet Mask:
Octets
255 indicates that this octet will be
compared between two IP addresses.
0 indicates that this octet will not be
compared between two IP addresses.
Figure 75. Typical Subnet Mask
FOX Matrix 3200 and 7200 Switchers • Ethernet Connection 122