NICET SSI case studies
NICET SSI · Put your knowledge to work in context.
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1Door Release Through a Polled Software Gateway
A nine-story Class B office tower is being commissioned with 38 electromagnetic door holders and 22 card-reader doors fitted with magnetic locks. The fire alarm is a networked system with four nodes; the access control system is a separate head-end that polls the fire panel every 60 seconds through a Modbus TCP gateway.
912 words, about 5 min2Voice System Riding the Campus Core Network
A four-building university campus runs one networked emergency voice/alarm communication system: 96 nodes, 1,200 speakers, and a single system-wide operator console in the police dispatch center. The IT department requires the fire alarm to ride the shared campus core as a VLAN with DHCP addressing, arguing that a private fiber plant would duplicate infrastructure.
924 words, about 5 min3Smoke Control Driven by the Building Automation System
An 11-story hotel with a six-story atrium uses the building automation system to drive smoke control: 14 rooftop units, 62 smoke dampers, six stairwell pressurization fans on variable-frequency drives, and relief dampers, all on a BACnet MS/TP trunk at 19.2 kbps with a 10-second polling interval. The written sequence of operations says that on any alarm in a smoke zone, the associated rooftop units stop, the stairwell fans start, and the dampers in the zone open.
1,030 words, about 5 min4Priority Conflict Between Fire Alarm and Mass Notification
A suburban school district operates three K-12 buildings and an outdoor athletics stadium on one combined emergency communication system. The fire alarm voice panels and the district's mass notification system share amplifier racks and speaker circuits; the stadium has a 24-speaker outdoor array.
988 words, about 5 min5Remote Supervision and Dealer Remote Access Across 30 Sites
A 30-store retail chain monitors all locations from one central station. Each store has an addressable fire panel, an IP communicator on the store's broadband circuit, and a cellular radio that was specified as a redundant path.
1,067 words, about 5 min