Serial line speed on SUN Ultra

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My apologies for the lack of explanation ...

With mgetty at 9600 or 38400, I obtain in log file :
--
02/18 15:14:42 a/a  mgetty: experimental test release 1.1.1-Jan28
02/18 15:14:44 a/a  WARNING: DSR is off - modem turned off or bad cable?
02/18 15:26:14 ##### data dev=cua/a, pid=18306, caller=none, conn='14400/ARQ/V32/LAPM/V42BIS', name='', cmd='/bin/login', user='bda'

but at 57600 :
--
02/18 14:58:47 a/a  mgetty: experimental test release 1.1.1-Jan28
02/18 14:58:49 a/a  WARNING: DSR is off - modem turned off or bad cable?
02/18 14:59:12 a/a  timeout in chat script, waiting for `OK'
02/18 14:59:12 a/a  init chat timed out, trying force-init-chat
02/18 14:59:36 a/a  timeout in chat script, waiting for `OK'
02/18 14:59:36 a/a  init chat failed, exiting...: Interrupted system call
02/18 14:59:36 ##### failed in mg_init_data, dev=cua/a, pid=18133

With tip, in my /etc/remote :

cuaa:dv=/dev/cua/a:br#38400
kk:dv=/dev/cua/a:br#57600

The commands :

# tip cuaa
connected
at
OK
~
[EOT]
# tip kk
connected
at 	--> command echoed but no answer
~t
[EOT]
#

This seems to be a serial line problem or a modem problem.
-- 
                 ___                Philippe BOURDEU d'AGUERRE
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