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Telephone and external devices (MFC-1810 and MFC-1815)

49

8

External and extension

telephones 8

NOTE

An external telephone is available only for

MFC-1810.

Connecting an external or

extension telephone 8

You can connect a separate telephone

directly to your machine as shown in the

diagram below.

1 Extension telephone

2 External telephone

When you are using an external telephone,

the LCD shows Telephone.

For Fax/Tel mode only 8

When the machine is in Fax/Tel mode, it will

use the F/T Ring Time (fast double-ringing) to

alert you to pick up a voice call.

Lift the external telephone’s handset

(MFC-1810 only) or the machine (MFC-1815

only), and then press Tel/R or Tel/Mute to

answer.

Using extension telephones

(U.K. only) 8

Your premises may already be wired with

parallel extension telephones (those

connected to sockets in other rooms in the

building), or perhaps you intend to add

extension telephones to your line. While the

simplest arrangement is a parallel

connection, there are some reasons why this

arrangement may cause problems.

The most common problem is someone

picking up an extension telephone while the

machine is trying to send a fax.

Such 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 figure 2). In

such a configuration, this machine can

always detect whether a telephone is in use,

so 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

inserted into the modular socket of the white

“T”-shaped connector provided as part of the

line cord assembly.

1

(Example for UK)

2

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