GAI-Tronics 226-003 S.M.A.R.T. Phones with Keypads - Manual (Page 15)

Pub. 42004-349F
S.M.A.R.T. P HONES WITH K EYPADS P AGE
14 of 21
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Auxiliary Output
Each telephone includes one isolated solid state switch capable of switching a maximum of 48 V dc, 125
mA or 28 Vrms ac, 80 mArms. TB2 (OUT1) on the phone PCBA provides the connections for the
auxiliary output. Refer to Figure 12 for the location of the TB2.
The auxiliary output allows for control of external electric devices such as a ringing indicator lamp. This
isolated contact output activates while the telephone sounds its ringer at the start of an incoming call and
will extinguish when the handset is lifted from its cradle (call answered).
This auxiliary output can be manually activated (after a 2-second delay) when the called party presses the
DTMF + or # key. The relay then remains active for the duration of the call.
Figure 12. S.M.A.R.T. Phone PCBA