Extron electronic DXP DVI PRO manual Subnetting, a Primer, Gateways, Local and remote devices

Setting carriage return-line feed

Unless commanded otherwise, Telnet transmits a line feed character only (no carriage return) to the connected switcher when you press the <Enter> key. This is the correct setting for SIS communication with the switcher. The Telnet set crlf command forces Telnet to transmit carriage return and line feed characters when <Enter> is pressed; however, if crlf is set, the SIS link with the switcher does not function properly.

Closing the link to the switcher

To close the link to the switcher, access the Telnet prompt by entering the escape sequence (<Ctrl + ]>). At the Telnet prompt, enter close.

Help

For Telnet command definitions, enter ? at the Telnet prompt.

Exiting Telnet (Quit command)

Exit the Telnet utility by entering quit at the Telnet prompt. If you are connected to the DXP switcher, access the Telnet prompt by entering the Escape sequence (<Ctrl + ]>).

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).

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 computer to set TCP/IP and e-mail values in the DXP switcher (see “IP Setup” on page 79 and “Email Settings Page” on page 113). When you are setting up the variables for e-mail notification, 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 sub-fields, called “octets,” which are separated by dots (periods) (figure 121). 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.

Typical IP Address: 192.168.254.254

Octets

Figure 121. IP Address and Octets

DXP DVI, DXP DVI Pro, and DXP HDMI Series • Reference Information 129