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Introduction
Using extension telephones (For U.K. only)
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 fax 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, fax
receive may not operate reliably in such a simple configuration.
This fax 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 fax machine, in a
master/slave configuration. In such a configuration, this fax
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 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.
These phones are now connected as external devices as per
page 1-7, because they are connected to the fax machine via
the T-connector.
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
Fig. 2.
FAX
FAX MACHINE MUST BE PLUGGED
INTO MASTER SOCKET
DISCONNECT