How can I use telnet client to open a raw connection - like PuTTY?

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http://unix.stackexchange.com – I need to use telnet to talk with a socket server which is not a standard Telnet server. I do not want any Telnet negotioation or interference of any kind in the data. This is available as 'raw mode' in PuTTy and I need the same functionality in Linux. (HowTos)