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Serial null cable modem

Discussion in 'Sun Hardware' started by noone, May 27, 2004.

  1. noone

    noone Guest

    I have a Nortel Annex terminal server, of which I want to connect an E280R and a StorEdge 3310.

    The Annex's 8 serial ports are all RJ45.
    The E280R has a 25-pin serial port.
    The 3310s has a 9-pin serial port.

    I have been asking around in the electronics shop here in Sydney ( Tandys, Dick Smith, Reids behind the QVB ),
    but when I say serial null cable, they dont seem to completely understand what I mean.
    ( Except for one guy who understood what I meant, but said they are out of stock ).
    They ask, "oh, a crossover" ... but IIRC, a crossover <> null serial cable.
    Then there is another cable called a rollover.

    So what's the diff between a null cable, a crossover, and a rollover ?
    noone, May 27, 2004
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  2. noone

    Arthur Marsh Guest

    The difference may be in that some cables do not pass the RTS line on
    one side to CTS on the other like a true hardware handshaking null modem
    cable. I believe that a hardware handshaking null modem cable is the
    same as a crossover cable, and have bought hardware handshaking null
    modem adaptors (rather than cables) from Disk Smith in the past.

    Arthur Marsh, May 27, 2004
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