Urgent: can't hookup to ISP

["Li Wei" <leeway@kali.com.cn>]

I have Debian 2.0. I made a connection by pppconfig but can't hookup to ISP
by pon. Below is part of /var/log/ppp.log:

...
Jan  1 05:33:25 debian pppd[496]: Serial connection established.
Jan  1 05:33:34 debian pppd[496]: Using interface ppp0
Jan  1 05:33:34 debian pppd[496]: Connect: ppp0 <--> /dev/ttyS2
Jan  1 05:33:34 debian pppd[496]: sent [LCP ConfReq id=0x1 <asyncmap 0x0>
 <magic 0x9dd3> <pcomp> <accomp>]
Jan  1 05:34:01 debian last message repeated 9 times
Jan  1 05:34:04 debian pppd[496]: LCP: timeout sending Config-Requests
Jan  1 05:34:04 debian pppd[496]: Connection terminated.
Jan  1 05:34:04 debian pppd[496]: Receive serial link is not 8-bit clean:
Jan  1 05:34:04 debian pppd[496]: Problem: all had bit 7 set to 0
Jan  1 05:34:13 debian pppd[496]: Terminating on signal 15.
Jan  1 05:34:14 debian pppd[496]: Hangup (SIGHUP)
Jan  1 05:34:14 debian pppd[496]: Exit.

Please reply to leeway@kali.com.cn because I will leave the list in a
minute.