ZyXEL Communications Omni TA128 - Manual (Page 23)

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DTR - The data terminal ready LED lights up when the DTE or
computer connected to the DTE Port indicates that it is ready for
communication by raising the corresponding RS-232 signal.
TX - The transmit data LED flashes when the DTE/Computer is
transmitting data to the DTE Port of the TA128.
RX - The receive data LED; lights up when the DTE/Computer is
receiving data from the DTE Port of the TA128.
Phone 1 - The phone 1 LED lights up when the POTS port 1
telephone/handset is off-hook.
Phone 2 - The phone 2 LED lights up when the POTS port 2
telephone/handset is off-hook.
Front Panel Switch
When the TA128 is in command state, pressing the front panel
button causes it to dial the default phone number pre-stored in the
NVRAM. The default number pointer to the telephone directory is
assigned by the AT*Dn command.
When the TA128 is on-line, pressing the button will tear down the
connection and bring it into command state.
To restore the TA128 to its factory default settings and initiate the
loop-back test, turn the power ON while pressing and holding the
switch. Continue holding the switch for 3 to 5 seconds after turning
the power ON.