Brother MFC-9330CDW Owner's Manual page 6

WARNING
The machine must be grounded using a
3-prong plug.
Since the machine is grounded through the
power outlet, you can protect yourself from
potentially hazardous electrical conditions on
the telephone network by keeping the power
cord connected to your machine when you
connect it to a telephone line. Similarly, you
can protect yourself when you want to move
your machine by disconnecting the telephone
line first and then disconnecting the power
cord.
NOTE
If you are sharing one telephone line with an
external telephone, connect it as shown below.
Before you connect the external telephone,
remove the protective cap c from the EXT. jack
on the machine.
a Extension telephone
b External telephone
c Protective cap
6
NOTE
If you are sharing one telephone line with an
external telephone answering machine, connect it
as shown below.
Before you connect the external telephone
answering machine, remove the protective cap c
from the EXT. jack on the machine.
a Extension telephone answering machine
(not supported)
b External telephone answering machine
c Protective cap
Set the receive mode to External TAD if
you have an external answering machine
(see Choose a Receive Mode on page 7).
For additional details, see Basic User's
Guide: Connecting an external TAD
(telephone answering device).