Fire-Lite IPDACT-2UD Technical Reference - Manual (Page 5)

Public Telephony
Switched Network
Alarm
Control Panel
Client
Alarm Receiver
Sur-Gard/Radionics Automation SW
IBS/ MAS/ MicroKey
Fax
Alarm Receiver Center
Figure 1. Traditional security scenario
Within the general user scenario, the IPDACT-UD device is located in the
client area, next to the control panel, intercepting the telephone line. This is
displayed in Figure 2. The arrow in the figure demonstrates the preferred
path to send alarms from the CP; here the telephone line is used as a backup
in case there is a communication malfunction in the IP network.
Figure 2. Teldat VisorALARM and IPDACT-UD operating scenario
The IPDACT-UD has a functionality incorporated giving rise to a third possible
scenario: network backup. In the previous scenario, where communication
fails between the device and the ARC, the IPDACT-UD hands over the
communications to the control panel. With the new functionality, the IPDACT-
UD tries to open communications with a second device, the backup
VisorALARM. Only in cases where there are problems with this second
device does the control panel take over. Meanwhile, even in this state, the
IPDACT-UD continues to try and communicate with the ARC until one of the
VisorALARMs responds.
IPDACT-UD - Introduction
I-2
Doc.DM385-I
Rev. 2.0