System architecture guide
Paging, PA, Bell & Intercom System Types
Modern communication systems range from simple 100V public-address installations to full IP and hybrid networks combining paging, bells, emergency messages and two-way intercom. Start with the architecture, then explore the functions your site actually needs.
Last reviewed 13 September 2026
Three architecture options
Almost every paging or PA proposal describes one of these three architectures. Understanding which one you are being quoted is the first step to judging whether it fits.
Traditional 100V PA
A classic amplifier-to-speaker architecture. A central amplifier drives 100-volt speaker lines run throughout the site.
Best for
- Simple one-way paging
- Existing analogue estates
- Cost-sensitive basic systems
Strength: Simple, mature and economical.
Trade-off: Less endpoint-level control and integration.
Full IP / PoE paging
Network-based endpoints where each speaker or intercom is an IP device powered over the network via PoE.
Best for
- Modern distributed sites
- Flexible zoning, bells and scheduling
- Two-way communication and network integration
Strength: Scalable control and endpoint intelligence.
Trade-off: Network readiness matters.
Hybrid IP + 100V
An IP control layer combined with retained 100V infrastructure, bridging new intelligence with existing speakers and cabling.
Best for
- Staged upgrades
- Retaining usable speakers and cabling
- Modern controls without replacing everything
Strength: Protects useful existing investment.
Trade-off: Design needs to account for both architectures.
What the system needs to do
Architecture is only half the decision. These guides break the system down by the functions a site actually needs.
IP Paging & PA
Live and scheduled announcements delivered over the data network to zoned speakers across a site.
School Bells & Announcements
Automated bell schedules, tones and daily announcements across classrooms, halls and outdoor areas.
Emergency & Lockdown
Lockdown, evacuation and emergency messaging with the coverage, zoning and intelligibility a site needs.
IP Intercom & Two-Way Communication
Fixed call points, gate entry and room-to-office two-way audio that can share paging infrastructure.
Planning resources
Compare platforms
Side-by-side comparison of leading paging and PA platforms sold in New Zealand.
Network readiness
Check cabling, PoE, switching and resilience before specifying an IP system.
School specification checklist
Define coverage, bells, emergency features and support so quotes compare fairly.
Pricing
How NZ paging and PA projects are priced, with indicative planning ranges.
School funding
Whether fixed communications work may fit a 5YA / 10YPP property pathway.