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Rev 3.0 B 2/29/08 53
ThedeviceservermonitorsitsDCDsignalinordertodetect
changesinthedeviceʹsDTRsignal.Thefollowingbehaviors
occuronlossofDCDonly..
Phone Numbers
The“phonenumber”usedinanoutgoingconnectionforan
“ATD”commandmaybearealphonenumberthatistrans
‐
latedtoanIP/portpair(seePhoneNumberTranslation)orit
consistsofanIPaddressandoptional portnumber.Allleading
non‐numericcharacters(suchastheTorPdialmodifiers)are
ignored.Anumberofformatsareacceptedforthe“IP”phone
number.
Mode Modem DCD Settings Behavior
Command/Data Always on (&C0) DTR is asserted
Command/Data Follow connection (&C1) DTR is asserted only when TCP/IP
connection is present and has been accepted
via ATA or auto-answer. DTR is de-asserted
when connection is lost
Mode Modem DTR Settings Response to loss of DCD
Offline AT&D0 Ignore
Offline AT&D1 Ignore
Offline AT&D2 Ignore
Online AT&D0 Ignore
Online AT&D1 Drop to command mode, preserving connection
Online AT&D2 Drop to command mode, terminating any
connection
Format Example Notes
Dotted decimal a.b.c.d or 192.168.1.1 Numbers are from 0 to 255
Comma decimal a,b,c,d or 192,168,1,1 For programs that don't allow dots in phone
numbers