Remote Monitor Uses Landline To Transmit Data

Offering dial-up communications, Global Monitoring’s Messenger 8100 remote-monitoring unit tracks and reacts to conditions at remote, unattended, or inaccessible locations using common telephone lines.
Users can deploy the Messenger 8100 in applications where WiFi, ZigBee, or other communication networks are not readily available or not part of a current facility infrastructure. The autonomous unit also supports OEMs needing to monitor their third-party services at customer locations without taping into their customer communication networks.
The Messenger accommodates a wide variety of sensor types and is expandable to 16 inputs. It performs various remote-control tasks, tracking such conditions as temperature, humidity, voltage, air quality, sound level, occupancy, vibration, level, and flow. Information is delivered to a computer, phone, or fax via a landline-based interface or via optional cellular data or Ethernet interfaces. Although the Messenger does not require a central server or monitoring service, it is compatible with them.
Source: Global Monitoring