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Appendix A
A - 5
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 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 code
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 (see
fig. 2 on next page). 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 on the next page, 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 (PBX)
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.
Note
These phones are now connected as external
devices as per page A-3, 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