Special line considerations; Roll over phone lines; Two-line phone system- Page 124

Brother MFC-7420 User's Guide

2014 Dodge Charger SRT Owner Manual

Table of Contents

USER'S GUIDE MFC-7420/MFC-7820N
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A - 7

Special line 
considerations

Roll over phone lines

A roll over phone system is a group of two or 
more separate telephone lines that pass 
incoming calls to each other if they are busy. 
The calls are usually passed down or “rolled 
over” to the next available phone line in a 
preset order.

Your MFC can work in a roll over system as 
long as it is the last number in the sequence, 
so the call cannot roll away. Do not put the 
MFC on any of the other numbers; when the 
other lines are busy and a second fax call is 
received, the fax call would be transferred to 
a line that does not have a fax machine. 

Your 

MFC will work best on a dedicated line.

Two-line phone system

A two-line phone system is nothing more than 
two separate phone numbers on the same 
wall outlet. The two phone numbers can be 
on separate jacks (RJ11) or combined into 
one jack (RJ14). Your MFC must be plugged 
into an RJ11 jack. RJ11 and RJ14 jacks may 
be equal in size and appearance and both 
may contain four wires (black, red, green, 
yellow). To test the type of jack, plug in a 
two-line phone and see if it can access both 
lines. If it can, you must separate the line for 
your MFC. (See 

Easy Receive

 on page 4-3.)

Converting telephone wall 
outlets

There are three ways to convert to an RJ11 
jack. The first two ways may require 
assistance from the telephone company. You 
can change the wall outlets from one RJ14 
jack to two RJ11 jacks. Or, you can have an 
RJ11 wall outlet installed and slave or jump 
one of the phone numbers to it.

The third way is the easiest: Buy a triplex 
adapter. You can plug a triplex adapter into 
an RJ14 outlet. It separates the wires into two 
separate RJ11 jacks (Line 1, Line 2) and a 
third RJ14 jack (Lines 1 and 2). If your MFC is 
on Line 1, plug the MFC into L1 of the triplex 
adapter. If your MFC is on Line 2, plug it into 
L2 of the triple adapter.

Installing MFC, external 
two-line TAD and two-line 
telephone

When you are installing an external two-line 
telephone answering device (TAD) and a 
two-line telephone, your MFC must be 
isolated on one line at both the wall jack and 
at the TAD. The most common connection is 
to put the MFC on Line 2, which is explained 
in the following steps. The back of the 
two-line TAD must have two telephone jacks: 
one labeled L1 or L1/L2, and the other 
labeled L2. You will need at least three 
telephone line cords, the one that came with 
your MFC and two for your external two-line 
TAD. You will need a fourth line cord if you 
add a two-line telephone.

RJ14

RJ11

Triplex Adapter

RJ14

Detailed Information for Brother MFC-7420 User's Guide

Lists of information found in Brother MFC-7420 User's Guide - Page 124

  • 3.) Converting telephone wall outlets There are three ways to convert to an RJ11 jack.
  • 2. You will need at least three telephone line cords, the one that came with your MFC and two for your external two-line TAD.

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