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Actiontec 54 Mbps Wireless DSL Gateway User Manual
icmp
Internet Control Message Protocol. Allows error messages, text packages, and
informational messages to be transferred over the Internet.
H.323
A standard protocol for sending audio and video over the Internet.
T.120
A standard protocol for multimedia teleconferencing over the Internet.
SSH
Secure Shell. A method for the secure transfer of files from another computer.
Also enables remote capabilities (terminal, log in).