SUN Fire V100 serial interface (ttyb)

From: Beat Jucker (bj@glue.ch)
Date: Mon Oct 18 2004 - 09:10:22 EDT

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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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