Oce 3121 Technical & Service Manual page 908

(3) LINE DETECT 3
Press 'LINE DETECT 3'. Press ' OK ' to invoke the corresponding screen
This mode checks the CNG signal by the PLL.
When this mode is executed, a direct current is applied between L1 and L2,
putting the extension telephone into off-hook state. Then 100 Hz (CG) signals
are input from the line or the extension telephone. The notation "ON' will be
displayed upon detection of the signals.
(4) VOICE Tx
Press 'VOICE TX'. Press ' OK ' to invoke the corresponding screen. The func-
tioning of OMG is checked by transmitting two types of OMG to the line and
to the speaker.
96 TSM Océ 3121 SDS Description