Extron electronic 450 manual Subnetting a Primer, Gateways, Analog and Remote Devices, Quit

Quit

Exit the Telnet utility by typing quit and then pressing <Enter> at the Telnet prompt. If you are connected to the CrossPoint or MAV Plus 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 CrossPoint or MAV Plus switcher and the mail server gateway. To understand subnetting at the level required to install and operate the CrossPoint or MAV Plus switcher, you must understand the concepts of a gateway, analog and remote devices, IP addresses and octets, and subnet masks and octets.

Gateways

The CrossPoint or MAV Plus 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).

Analog and Remote Devices

The analog 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 Email Settings Page on page 138). When you are setting up the variables for e-mail notification, which may include subnetting, the matrix switcher is the analog 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 105). 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.

Typical IP Address: 192.168.254.254

Octets

Figure 105. Typical IP Address

CrossPoint and MAV Series Matrix Switchers • Ethernet Connection 154