Circuit Description - Tadiran Telecom FlexSet 280 Manual

3
CPA Simplified
Figure 10-4
Paging & Relay Diagram

Circuit Description

Figure 10-4 is a simplified circuit diagram of the External Paging Interfaces, and the Relay
contacts.
Audio signals from the Coral system are passed through the audio coupling transformer to the
interface. A direct current (DC) blocking capacitor protects the secondary winding of the audio
coupling transformer from conducting DC energy.
The relay provides form A (single pole, single throw, normally open; or SPST-NO) contacts for
activating external circuitry and devices. The relay is designated to operate in conjunction with
audio interface when the CPA is activated for external paging. Care must be taken not to
exceed the contact ratings listed in the Specifications (see page 10-13).
The relay operates through pins 2 and 5, whether connected to the 600 Ohm audio outlet, or via
the Hi-Z (RCA) connection.
DIGITAL-
ANALOG
CONVERTER
Voice ON/OFF
T1
RJ-11
5
RELAY
Normally Open
(pins 2/5)
2
4
VOICE PAGE
600 ohm
(pins 3/4)
3
VOICE PAGE
Hi-Z
(RCA JACK)
10-5
Coral Terminal Equipment