Keltron's DMP703/4 modular alarm monitoring systems employ card cages - nests - that enable rapid, reliable receiving and processing of direct-connect alarms/events. Versatile, cost effective nests enable growth, accept a wide variety of plug-in alarm input cards, and help contain costs.
Benefits of nest technology
Scalable - adds extensive monitoring capacity
Versatile - accepts a wide variety of input cards
Cost effective - purchase only the needed amount of monitoring
Types of subscriber nests
The system's computer sequentially monitors the status of nest inputs at a speed of 2,000 zones every 80 milliseconds. The first three nests each accept up to sixteen 25-zone input cards:
400-zone end-of-line (EOL) resistors - provide four conditions for each zone (using up to 3 resistors) with both opens and shorts indicating trouble as one condition.
400-zone reverse polarity (RP) - increases alarm transmission integrity typically from alarm control panels.
400-zone tones nest - used in direct-connect systems that involve fiber optics in the transmission path. One zone in the tones nest is normally reserved for supervision.
CSU central signaling unit - accepts inputs from up to six data gathering panels; also available is a CSU line switch unit with automatic switching used in systems with dual links for redundancy.