Martin Loeffler wrote:

 > tty00	"/usr/sbin/pppd"	unknown on rtcsts

This message occurs exactly under the circumstances it says: When pppd
is started up several times with only a minimal delay. Then init will
pause this tty for 30(?) seconds and then start pppd again. This is
usually quite useful, to give the modem some time to "recover". :)

	-peter