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SETUP & PREPARATION BEFORE USE - CHAPTER 1
FOR YOUR INFORMATION (For U.K.)
Using extension telephones
It may be that your premises are already wired with parallel extension telephones, or
you intend to add extension telephones to your line, in addition to your machine. While
the simplest arrangement is straightforward parallel connection, there are some reasons
as to why this arrangement will cause unsatisfactory service, the most obvious of which
is inadvertent interruption of a facsimile transmission by someone picking up an extension
telephone in order to make an outgoing call. Additionally, remote activation may not
operate reliably in such a simple configuration.
This machine may also be set to make a delayed transmission (i.e. a transmission at a
pre-set time). This pre-set job may coincide with someone picking up an extension handset.
Such problems can easily be eliminated however, if you arrange modification of your
extension wiring circuit, such that extension devices are connected “downstream” of
your machine, in a master/slave configuration. In such a configuration, this machine
can always detect whether a telephone is in use, thus it will not attempt to seize the line
during that time. This is known as “telephone off-hook detection.”
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.
FAX
EXTENSION
SOCKET
EXTENSION
SOCKET
MASTER
SOCKET
INCOMING
LINE
INADVISABLE CONNECTION OF EXTENSION SOCKETS
Fig. 1.
EXTENSION
SOCKET
EXTENSION
SOCKET
MASTER
SOCKET
INCOMING
LINE
RECOMMENDED CONNECTION OF EXTENSION SOCKETS
Fi
g
. 2.
FAX
FAX MACHINE MUST BE PLUGGED
INTO MASTER SOCKET
DISCONNECT