What is redundancy?
In the technology world redundancy means that certain facilities are implemented in multiple ways. The way in which systems are implemented with redundancy varies considerably and that affects reliability accordingly.
Adésys and redundancy
Traditionally, critical alarms were forwarded over analogue telephone lines (PSTN) and ISDN. Effective from 2019, the 'obsolete fixed lines' will disappear and ISDN1/2 will disappear along with it. Over the years many analogue lines (also known as PSTN or fixed lines) have already disappeared and have been replaced by digital lines. Voice over IP (VoIP) and GSM are being used to forward alerts about process and technical installation malfunctions.
The availability of these more modern facilities is not always as high as the traditional telephone lines. The downtime of the providers of internet and GSM connections and, for example, the risk of dropped internet/VoIP modems mean that an additional safety net must be built in to ensure a watertight system of telephone alerts.
A single telephone connection often is not enough to guarantee the reliability of telephone-based alerts. If an analogue telephone line or VoIP connection is not available, then GSM or internet can provide assurance that no events go by unnoticed.
Emergency power supply
The internet modems used to establish call connections are connected to the mains power supply. In case of a power outage, the modem stops working making it impossible to make any calls or transmit any alerts. Our solutions therefore include a built-in emergency power supply.
Leading insurance companies recommend such system monitoring. Definitely when the installation being monitored is critical.