Brother MFC-4820C User Manual page 35

The inadvisable configuration is shown in figure 1 below, and the
recommended master/slave configuration is shown in figure 2.
This new connection configuration can be arranged by your
contacting BT, Kingston upon Hull Telecommunications, your PABX
maintainer or a qualified telephone installation company as
appropriate. Simply explained, the extension telephone circuit
should be terminated on a normal modular plug (BT 431A style),
which in turn should be inserted into the modular socket of the white
"T"-shaped connector provided as part of the line cord assembly.
EXTENSION
SOCKET
INADVISABLE CONNECTION OF EXTENSION SOCKETS
EXTENSION
SOCKET
RECOMMENDED CONNECTION OF EXTENSION SOCKETS
These phones are now connected as external devices as per
page 1-10, because they are connected to the fax machine via
the T-connector.
EXTENSION MASTER
SOCKET SOCKET
FAX
Fig. 1.
DISCONNECT
EXTENSION
SOCKET
FAX MACHINE MUST BE PLUGGED
INTO MASTER SOCKET
Fig. 2.
INCOMING
LINE
MASTER
SOCKET
INCOMING
LINE
FAX
INTRODUCTION 1 - 15