Keltron: Products: Life Safety Alarm Monitoring Systems: Tones Fiber Optic Nest

Whether a facility's environment utilizes fiber optic or copper telephone wires or microwave linked lines, Keltron's Tones modules can enable communication of critical fire and security alarm signals. The Keltron 95DM728 Tones nest allows subscribers to connect to a central monitoring facility via voice grade links.

Easily connected
The 95DM728 Tones nest is configured in the standard Keltron nest arrangement. A 50-pin, D-style telephone connector mounts on each 25-zone subscriber card (95M3042) to accept a 25-pair telephone cable. The inputs are electrically isolated from the rest of the circuit, thereby eliminating the need for an isolated power supply. The nest utilizes a microprocessor-based control card to decode the signals routed to it via the motherboard, and to provide the interface to the DMP70X System. The nest has maximum capacity of 399 zones with one zone always reserved for supervision.

How it works
Voice grade signals or audio tones are generated at protected premises by the 95M3086 transmitter module. Using special MSI-integrated circuits, it generates three sets of tones under crystal control for stability. The 95M3086-1 module can be used for two alarm conditions, plus secure with the absence of any tones signaling a trouble condition. The transmitter operates on power supply voltages from 7V to 14V at approximately 8mA. It can monitor two sets of contacts and they can be either normally open or normally closed as determined by field-programmable jumpers. In the event that both inputs occur simultaneously, the transmitter generates only the higher priority tone. Optionally, the 95M3086 transmitter can accept two independent sets of reverse polarity inputs at 2mA maximum.

Subscriber cards
On the subscriber card (95M3042), each of the 25 input pairs are connected to a transformer. The secondary side of the transformer has diodes to minimize the effects of transients or lightning. For a nest with less than 16, 25-zone cards, a special terminator card may be installed to mark the end of active slots. Subscriber card outputs connect to the nest control card via the motherboard (95M2878). The subscriber card includes 25 dipswitches, one for each zone. These signal the nest control card when the input to a zone is disconnected so that troubles (opens or shorts) for that zone are not reported to the host system, the Keltron DMP70X.

The central computer
The nest control card (95M3043) is microprocessor-based. Its primary function is to scan the inputs and report their status to the system. Keltron DMP70X systems scan the nests at approximately 25,000 inputs per second, and more slowly scan the voice grade inputs due to the nature of tone decoding. The nest control card has two independent tone decoders, which together scan the inputs at 19 zones per second. Since the Tones nest includes a card that reports the number of installed subscriber cards to the nest control card, the software minimizes nest scanning time and reports cards that become uninstalled.

Scalable
The Tones nest is capable of decoding more tones than at transmitter card provides. Should there be a need to send more priorities per unit, this can be accomplished by upgrading the transmitter card to monitor more inputs and produce more tones. Tones nest hardware will only need an upgraded nest control card.

Ethernet Networking Systems Active Network Radio Systems Fire and Security Alarm Systems Distributed Multiplex Solutions Digital Alarm Communicator Receivers Coded Fire Alarm Equipment Tones Modules Tones Fiber Optic Nest Software Options New Products		Whether a facility's environment utilizes fiber optic or copper telephone wires or microwave linked lines, Keltron's Tones modules can enable communication of critical fire and security alarm signals. The Keltron 95DM728 Tones nest allows subscribers to connect to a central monitoring facility via voice grade links. Easily connected The 95DM728 Tones nest is configured in the standard Keltron nest arrangement. A 50-pin, D-style telephone connector mounts on each 25-zone subscriber card (95M3042) to accept a 25-pair telephone cable. The inputs are electrically isolated from the rest of the circuit, thereby eliminating the need for an isolated power supply. The nest utilizes a microprocessor-based control card to decode the signals routed to it via the motherboard, and to provide the interface to the DMP70X System. The nest has maximum capacity of 399 zones with one zone always reserved for supervision. How it works Voice grade signals or audio tones are generated at protected premises by the 95M3086 transmitter module. Using special MSI-integrated circuits, it generates three sets of tones under crystal control for stability. The 95M3086-1 module can be used for two alarm conditions, plus secure with the absence of any tones signaling a trouble condition. The transmitter operates on power supply voltages from 7V to 14V at approximately 8mA. It can monitor two sets of contacts and they can be either normally open or normally closed as determined by field-programmable jumpers. In the event that both inputs occur simultaneously, the transmitter generates only the higher priority tone. Optionally, the 95M3086 transmitter can accept two independent sets of reverse polarity inputs at 2mA maximum. Subscriber cards On the subscriber card (95M3042), each of the 25 input pairs are connected to a transformer. The secondary side of the transformer has diodes to minimize the effects of transients or lightning. For a nest with less than 16, 25-zone cards, a special terminator card may be installed to mark the end of active slots. Subscriber card outputs connect to the nest control card via the motherboard (95M2878). The subscriber card includes 25 dipswitches, one for each zone. These signal the nest control card when the input to a zone is disconnected so that troubles (opens or shorts) for that zone are not reported to the host system, the Keltron DMP70X. The central computer The nest control card (95M3043) is microprocessor-based. Its primary function is to scan the inputs and report their status to the system. Keltron DMP70X systems scan the nests at approximately 25,000 inputs per second, and more slowly scan the voice grade inputs due to the nature of tone decoding. The nest control card has two independent tone decoders, which together scan the inputs at 19 zones per second. Since the Tones nest includes a card that reports the number of installed subscriber cards to the nest control card, the software minimizes nest scanning time and reports cards that become uninstalled. Scalable The Tones nest is capable of decoding more tones than at transmitter card provides. Should there be a need to send more priorities per unit, this can be accomplished by upgrading the transmitter card to monitor more inputs and produce more tones. Tones nest hardware will only need an upgraded nest control card.
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