Extron Electronics DXP HDMI User Guide - Manual (Page 134)

DXP DVI Pro and DXP HDMI Series • Reference Information 128 128
Local echo can be turned off by entering unset local_echo at the Telnet prompt. If your
computer is connected to the DXP switcher, and you need to access the Telnet prompt to
turn local echo off, enter the
Escape sequence (<Ctrl + ] > ).
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 78 and “ Email Settings Page ” on page 112). 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.