It depends, I can't remeber off the top of my head . Some implimentations
use Data carier detect (DCD) some don't. I think it means the modem has
carrier. I should know all these, but I forgot um. Some of these signals
indicate that the router or the modem has data ready to send so being up or
down depends on state. Some signals arne't used at all. One of the best
references I remember is the BCRAN book or courseware .Here is the best
link that I found that explains RS-232 signaling (now EIA/TIA 232).
http://ewhdbks.mugu.navy.mil/rs-232.htm
Sorry I couldn't be more help.
Tony M
#6172
> hi all
>
> anyone knows When the router was connected to the
> modem - DSR, DCD and CTS were
> down but RTS and DTR were up. What does this mean? Can
> anyone please explain?
> I guess this has something to do with hardware problem
> right?
>
> regards,
>
> suaveguru
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