5
DRD-4
CHAPTER 2: Introduction
2. Introduction
NOTE: The name “Distinctive Ringing
Service” may vary with each
telephone company. This service
may not be available in some
locations. Contact your local
telephone company to verify that the
service is available in your area.
The DRD-4 is compatible with any
telephone device that responds to
a standard phone company ring
signal. This guide defines a few of
the more popular combinations
used with the DRD-4.
2.2 Ports on the DRD-4
The rear panel of the DRD-4 includes
five modular ports and a power input
port, as shown in Fig. 2-1.
2.1 General
The DRD-4 deciphers the
“Distinctive Ringing Service”
provided by the telephone company.
This service uses a single phone line
for multiple phone numbers and
assigns a unique ring identity to each
number. Working with this service,
the DRD-4 identifes and directs each
of the four ring types to a designated
telephone device. You can connect
up to four different telephone
devices to a single telephone line,
giving you automatic operation and
eliminiating the need to flip switches
and turn machines on or off.
TEL LINE-IN
STYLE 1
STYLE 2
STYLE 3
STYLE 4
12 VAC
Fig. 2-1. Rear View of the DRD-4.
