Data sheet, Dss1 – Procom DSS1 User Manual

Page 6

Data Sheet

DSS1

Digital Speech Memory Module

Modes of Operation "Sync Master" and "Sync Slave"

A redundant public address system can be built with two DVS-21 systems in
order to ensure adequate public address capabilities for possible disrup-
tions.

Example: A redundant DVS-21 system

To do this the loudspeaker circuits (LK) are arranged in an alternating way with
the loudspeakers of system A and B (LK 1A / LK 1B and LK 2A / LK 2B) in or-
der to ensure adequate public address capabilities in the case of a disruption.
Announcements are triggered or made e.g. through or using a call station in
parallel operation. Because of running times, output through the loudspeakers
in both systems can become superimposed and unintelligible.
To solve this there is an additional synchronisation line between the two
DVS-21 systems (4NSA – 4NSA).
The DSS1 of the first system is set to the mode "Sync Master" and that of the
second system to the mode "Sync Slave". A 1 kHz signal is continuously
transmitted by the master. This signals operation-ready status to the slave sys-
tem. If an announcement is triggered, the master simultaneously transmits a 2
kHz signal together with the announcement and the slave system simultane-
ously begins the announcement.
These modes of operation are configured as option in the ICS.

Date: 13.03.2009

Page:

6/9 Author:

Document-No.:

DB_DSS1_2600_01