Inside a site edge gateway

Inside a site edge gateway An architecture diagram generated by Archify. Tier B units · alarm contacts · Architecture component Tier B units alarm contacts Digital I/O · dry contacts · Site edge on UPS + 4G, NIC/NPL time sync Digital I/O dry contacts Protocol collectors · Modbus, SNMP, BACnet · Site edge on UPS + 4G, NIC/NPL time sync Protocol collectors Modbus, SNMP, BACnet Local alarm engine · thresholds, silence · Site edge on UPS + 4G, NIC/NPL time sync · works offline Local alarm engine thresholds, silence works offline Siren + strobe · on site · Site edge on UPS + 4G, NIC/NPL time sync Siren + strobe on site GSM modem · SMS + voice · Site edge on UPS + 4G, NIC/NPL time sync GSM modem SMS + voice Tier A units · data ports · Architecture component Tier A units data ports Tier C probes · retrofit sensors · Architecture component Tier C probes retrofit sensors Store-and-forward · tagged replay · Site edge on UPS + 4G, NIC/NPL time sync Store-and-forward tagged replay Central platform · outbound TLS · Architecture component Central platform outbound TLS relay Modbus probe readings breach if cloud silent events outbound TLS Site edge on UPS + 4G, NIC/NPL time sync Legend Frontend Backend Database Cloud Security Message bus

Collect

  • • Tier A read directly; tier B via relays; tier C via retrofit probes
  • • Every reading keeps source and receipt time

Alarm locally

  • • Silence is an alarm, even offline
  • • Siren first; GSM if the cloud does not confirm

Forward

  • • Buffered through outages
  • • Backfill tagged as replayed