Gender Changing a X21 DCE cable (go from female to male)

Discussion in 'Cisco' started by Greg Krzeszkowski, May 24, 2004.

  1. Hi,

    would there be any disastrous effect if I converted a X21 DCE cable
    (female DB15) to male DB15? I realise I should buy a DTE cable, but
    I'm interested to see if I can do without it.


    Greg Krzeszkowski, May 24, 2004
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  2. As long as the Cisco will still act as a DCE, there should be no problem.
    Phillip Remaker, May 24, 2004
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  3. Hi Greg.

    If what you want is a DCE with a male connector (unusual) then you
    can do this. But that's not the same as a DTE cable. More than
    just the gender is different between a DTE and DCE. For example,
    the DTE transmits on pins 2/9 while a DCE sends its data out on pins

    If you are going to be connecting two DCEs together, you have to
    cross over TxData/RxData and control/indication. A null modem
    (usually used to connect two DTEs) should work if you change the
    gender on it. Normally a null modem wouldn't be any good between
    DCEs, but the clocking scheme is a little different on X.21 (than
    on V.35 or RS-232, for example).

    You can find null modem specs on our website ( in
    the support section.

    Steve Schefter, May 25, 2004
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