Computer/terminal
operational - DTR = Data Terminal Ready
The effect of this
control line on the ISDN terminal adapter is
determined by the command AT&D.
Switch on transmission -
RTS = Request To Send
Operational DSR = Data
Set Ready
This signal line is
normally always active (ON), but is influenced by
the commands AT\D and AT&S.
Clear to send CTS = Clear
To Send
This output is normally
always active (ON), but is influenced by the
commands AT\D, AT\Q and AT&R.
Incoming call RI = Ring
Indicator
This ISDN terminal adapter
output becomes active (ON) when the adapter
detects an incoming call (see also command ATA).
Incoming calls are detected only if the DTR
control line is active (ON) or the command AT&D0
has been issued.
Connection DCD = Data
Carrier Detect
This ISDN terminal adapter
output normally becomes active (ON) when the
adapter has established a valid connection.
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