CONNECT on dial-up before CD is high. Please comment on this

[Fairy]

Hi,

Thanks for your reply.


I took the modem logs while making a data call through dial-up. I saw
the following sequence:


12-20-2006 10:51:56.356 - Send: ATDT*###<cr>
12-20-2006 10:52:00.762 - Recv: <cr>
12-20-2006 10:52:00.762 - Interpreted response: Informative
12-20-2006 10:52:00.762 - Recv: <lf>
12-20-2006 10:52:00.762 - Interpreted response: Informative
12-20-2006 10:52:00.762 - Recv: CONNECT
12-20-2006 10:52:00.762 - Interpreted response: Connect
12-20-2006 10:52:00.762 - Receive Connect but CD was low, Waiting for
signal to go high
12-20-2006 10:52:00.793 - After waiting 20ms CD is still low.
12-20-2006 10:52:00.825 - After waiting 20ms CD is still low.
12-20-2006 10:52:00.856 - After waiting 20ms CD is still low.
12-20-2006 10:52:00.887 - After waiting 20ms CD is still low.
12-20-2006 10:52:05.794 - CD never went high, Proceeding with
connection.
12-20-2006 10:52:05.794 - Connection established at 9600bps.
12-20-2006 10:52:05.794 - Error-control off or unknown.
12-20-2006 10:52:05.794 - Data compression off or unknown.
12-20-2006 10:52:05.872 - CD dropped--Remote modem hung up.
ModemStatus=00000010
12-20-2006 10:52:05.872 - While processing CD dropping, CTS or DSR was
found low.
12-20-2006 10:52:05.872 - Hanging up the modem.
12-20-2006 10:52:05.872 - Recv: ~
12-20-2006 10:52:05.872 - Unknown Response
12-20-2006 10:52:05.872 - Recv: <ff>}#<c0>!}"} } }4
12-20-2006 10:52:05.872 - Unknown Response
12-20-2006 10:52:05.887 - Recv: }
12-20-2006 10:52:05.887 - Unknown Response
12-20-2006 10:52:05.887 - Recv: "}&} } } } }%
12-20-2006 10:52:05.887 - Unknown Response
12-20-2006 10:52:05.903 - Recv: }
12-20-2006 10:52:05.903 - Unknown Response
12-20-2006 10:52:05.903 - Recv: &}*<8b>9<cd>}'}"}(}
12-20-2006 10:52:05.903 - Unknown Response
12-20-2006 10:52:05.919 - Recv: "


I have 2 questions here:


1) CD is asserted high by DCE when connection has been established with

remote equipment. So I should receive CONNECT after CD goes high. How
do I receive CONNECT even thought the CD was low?


2) At a point logs say : CD never went high, Proceeding with
connection.Connection established at 9600bps.
Here the question is If connection was not established with remote
equipment, how is DCE proceeding with the connection and how it says
that the connection is established at 9600bps?


Thanks and regards, 

Fairy