Brother MFC-235C Betriebsanweisung PDF herunterladen (Seite 51)

Telephone and External devices

41

7

Using extension telephones

(For U.K. only) 7

Your premises may already be wired with

parallel extension telephones, or you may

plan to add extension telephones to your line,

as well as your machine. While the simplest

arrangement is a straightforward parallel

connection, there are some problems with

this arrangement, the most obvious of which

is inadvertent interruption of a facsimile

transmission caused by someone picking up

an extension telephone to make an outgoing

call. Also, Remote Activation 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.

These problems can easily be eliminated, 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). In this

configuration the 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, 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 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

put into the modular socket of the white

‘T’-shaped connector provided as part of the

line cord assembly.

Inadvisable connection of extension

sockets (Fig. 1.)

7

1 Extension socket

2 Master socket

3 Incoming line

Recommended connection of extension

sockets (Fig. 2.)

7

1 Extension socket

2 Master socket

3 Incoming line

The fax machine must be plugged into master

socket.

Note

These telephones are now connected as

external devices (see Connecting an

external or extension

telephone on page 40), because they are

connected to the fax machine via the

T-connector.

FAX

11

2

3

FAX

11

2

3

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