SUN Fire V100 serial interface (ttyb)

From: Beat Jucker (bj_at_glue.ch)
Date: 10/18/04

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    Date: Mon, 18 Oct 2004 15:10:22 +0200
To: sunmanagers@sunmanagers.org

    Hello admins

    I'm stuck ... any hint?

    I have two Sun Fire V100, seriall interface on one system is working as
    expected the other looks mysterious.

    system a)
      - ttya: console port (no problem at all)
      - ttyb: modem port (used by kermit), no problem at all

    system b)
      - ttya: console port (no problem at all)
      - ttyb: modem port (used by kermit), flickering signals DTR & TD
              never used before, can't reboot right now because it is a
              productive system

    I also have used the same cable on system b) as on system a) but no
    difference! The OS looks also similar. How can I debug this second
    serial port? What's the reason for this flickering Ports even there
    is nothing connected except a RS232 serial breakout box for checking
    state of the lines (this port ttyb is not used for login)?

    Best regards
    -- Beat Jucker
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