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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.
EXTENSION
SOCKET
INADVISABLE CONNECTION OF EXTENSION SOCKETS
EXTENSION
SOCKET
RECOMMENDED CONNECTION OF EXTENSION SOCKETS
12
EXTENSION
SOCKET
FAX
Fig. 1.
DISCONNECT
EXTENSION
SOCKET
FAX MACHINE MUST BE PLUGGED
INTO MASTER SOCKET
Fig. 2.
MASTER
SOCKET
INCOMING
LINE
MASTER
SOCKET
INCOMING
LINE
FAX
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