Data sheet, Dss1 – Procom DSS1 User Manual

Page 4

Data Sheet

DSS1

Digital Speech Memory Module

The module is available in two variations which only differ in terms of their soft-
ware:

- Ringing tone detector
- Speech memory

Variation "Ringing tone detector":

This variation is currently in use at the Deutsche Bahn AG and serves to
switch on radio modules.

Basic arrangement of a DVS-21 for ringing ton analysis

The DSS1 checks cyclically whether a signal is pending from the radio module
on the low frequency line. If a radio subscriber sends a call signal, the fre-
quency is determined from it internally and compared to the three values
stored in the EPROM. Each of these frequencies is allocated to a line. When
there is a match then the corresponding line is sent to the DVS-21 and the
right DVS-21 subscriber is called.
In order to make a connection between the DVS-21 subscriber and the radio
module (and thus the corresponding radio subscriber) the radio module needs
a control line as switch criteria. This is sent over the 24LI with the pressing of
the appropriate range button on the call station, regardless where the connec-
tion request originated. The connection is only terminated after the delete but-
ton is pressed or after a timeout. To speak, the DVS-21 subscriber must keep
the speaking button pressed, and to listen, let go again.
Optionally the sending of a free line signal and a busy signal can be selected
in the configuration software (ICS). If the subscriber being called is currently
speaking, a short signal is sent twice, otherwise a long signal is sent. Further-
more the limit values of the ringing tone (level and frequency) can be changed
in the ICS software.

Date: 13.03.2009

Page:

4/9 Author:

Document-No.:

DB_DSS1_2600_01