A point-to-multipoint monitoring configuration allows multiple offices or workstations to be protected by a single alarm system port rather than each requiring its own port. This enables many dozens of end-user drops to be protected by one alarm device, resulting in significant cost reductions per drop when compared to legacy protection methods.
Example: Point-to-multipoint Architecture
The number of end-user drops possible on a single INTERCEPTOR monitoring circuit is limited by two factors: the dynamic range of the system and the physical inspection requirements.
Typically, a multimode alarmed PDS has a range of 50dB and single mode, 55dB. As the monitoring signal passes through connection points, the optical signal is attenuated. In a typical network, the 50-55dB of range affords many dozen drops to be protected on a signal port. A single, four-port INTERCEPTOR can technically protect hundreds of drops.
The second limitation is the NSTISSI 7003 requirement to inspect all the cable and drops on the zone within 15 minutes if an alarm is received. The means the drops on a monitored circuit or zone must be contained within a close enough proximity to meet this requirement.
Read More about INTERCEPTOR for Point-to-Multipoint Architectures