Nortel Networks CTA 500dm - Manual (Page 61)

AT commands 61
P0873832 Issue 05 CTA 500 dm On Line Guide
DSR Operation
The DSR Operation Command
&Svalue
sets the operation of the DSR pin. The following table shows the
allowable values.
The DSR signal is turned on at start-up to be compatible with
Windows95 Plug and Play requirements. This corresponds to a &S
setting of 0. No other DSR values are supported.
Result Codes
OK Appears when the value is supported.
ERROR Appears when the selected value is not recognized or is not
supported.
RI Operation
The RI pin is asserted on detection of an incoming call that the
CTA 500dm is allowed to accept.
Normal public network cadencing is provided. The RI signal is
asserted for 2 seconds, then negated for 4 seconds. This cycle
continues until the call is answered, disconnected by the caller, or
the CTA 500dm resets (for example, assertion of DTR if &D is 2 or
3).
Calling Line ID
If Calling Line IdentiÞcation is available on an incoming call and is
enabled, a single indication is provided both with the Þrst RING
indication and when the RI signal is asserted.
The indication occurs in one of two formats. The Þrst is an additional
string of numbers that appears with the RING indication. For
example, if the calling number is 123-4567, the Þrst RING
Value Use
0 DSR is always on (default)
1 DSR is on after protocol is installed (not supported)