SilentKnight VisorAlarm Plus 2U - Manual (Page 5)

VISORALARM - Introduction
I - 3
Doc.DM374-I
Ver. 1.0
2. Installation Scenario
A traditional security scenario consists of a control panel (CP), located in the client environment and
an alarm receiver center (ARC) located in the security company’s control center. The CP contains a
group of sensors which trigger a series of alarms or events which, when produced, are sent to the ARC
to be processed.
Communication between the above is traditionally carried out over the telephone line so that both ends
can initiate a call to the remote end: the CP in order to notify events and the ARC for bi-directional
tasks (activation, teleloading and general control).
Public Telephony
Switched Network
Alarm
Control Panel
Client
Alarm Receiver
Sur-Gard/Radionics Automation SW
IBS/ MAS/ MicroKey
Fax
Alarm Receiver Center
Figure 2. Traditional security scenario
The communication protocol varies depending on the manufacturers who usually tend to use their own
solutions.
The CP is placed as the first connection element to the PSTN so that it can prioritize the customer’s
telephone line.
Within the general user scenario, the device in question is located in the client area, next to the control
panel, intercepting the telephone line. This is displayed in Figure 3. The arrow in the figure
demonstrates the preferred path to send alarms from the CP; in a Burglary application (using mIP
devices) the telephone line is used as a backup in case there is a communication malfunction in the IP
network. In a Fire Application (using IPDACT devices) a second telephone line is used as a backup.