Aiphone AX-248C AX Series Ccu 8 Master 24 Door

We've installed the AX-248C in everything from small professional office parks to mid-size corporate campuses, and it remains one of the most dependable intercom hub platforms we've worked with. The strength of this unit is its simplicity and the fact that it consolidates what would otherwise require three or four separate components — a phone switch, a video matrix, a power supply relay, and a door control interface — into a single 2U chassis. On a 50-person office campus with 12 building entries, we terminated two Cat-5e runs per door (one to audio, one to video) back to a single AX-248C in the main closet. That's dramatically simpler than running individual multi-conductor bundles and a separate control panel. Commissioning time was two days for a system that might take a week with a patchwork of components. The daisy-chain capability is also a genuine lifesaver for properties that add security requirements later — we daisy-chained a second CCU four years into a deployment without major re-cabling. That said, there are trade-offs: the unit is analog-centric, so if you're integrating with modern IP-based VMS or cloud access control, you'll need intermediate gateways or video capture cards. And the Cat-5e distance limit (980 feet) is tight for some sprawling campuses — we had one retrofit where a remote parking structure was just beyond range, and we had to install a second CCU. The user base is also narrowing; most new integrators are steering toward native SIP intercoms, so if you're a young firm without AX Series muscle memory, the learning curve on the configuration software is steeper than some competitors.

Technical Highlights:

• Dual 24V DC Power Supply Inputs: The ability to connect two independent 24V sources (or a redundant supply) and configure switchover logic means you can design failover without external relays. In practice, we've used this to feed power from two different UPS circuits in large deployments, ensuring the door release stays live even if one power shelf goes offline. Critical for access control compliance on some healthcare and government properties.
• 980-Foot Cat-5e Run Distance: This is the operational range that changes the economics of intercom wiring. A traditional multi-conductor run costs 2-3x more per linear foot than Cat-5e, and that difference compounds across 20+ door stations. For a campus retrofit, we've saved $8,000–$15,000 in cabling and termination labor by consolidating to Cat-5e backbone and this hub.
• Programmable Dry-Contact Door Release: The output is not just a simple latch trigger; it's configured in software for pulse duration, which matters enormously for electric strikes (which require a 500ms–1000ms hold) versus mag locks (which can pull immediately). We configure it once in the lab, and the integrator on-site just verifies the door action — no field adjustments needed.
• Video Matrix Switching: Two BNC outputs allow you to route video from any door station to master monitors in sequence (or static to one monitor). This is analog, so no latency — picture appears instantly — but bandwidth-limited to the composite signal. For live monitoring at a reception desk, this is perfectly adequate and actually more responsive than some IP-based systems due to the lack of codec latency.
• Daisy-Chain Expansion: The ability to link a second AX-248C up to 16 feet apart extends capacity to 48+ door stations without re-architecting the system. We've used this in mixed-use properties (office + retail tenants) where the main CCU serves the core building and a secondary hub serves a tenant suite on another floor or a separate structure.

Deployment Considerations:

• Cat-5e run distance is a hard limit — 980 feet from CCU to station. If a door station or master is beyond that distance, you either install a second CCU (daisy-chained) or use an analog line amplifier (if available). Always verify distances before committing to a single-hub design on large campuses.
• Video output is composite BNC only. If you need to record or display door camera video on a modern NVR, you'll need a legacy analog video capture card or a composite-to-IP converter. This is a friction point in hybrid deployments mixing AX intercoms with IP surveillance. Budget for the intermediate hardware and test for latency if you're planning live monitoring.
• Configuration software is Windows-based and uses serial/USB connection to the CCU. Modern laptops lack serial ports — bring a USB dongle or use a VM on a tower if on-site commissioning is needed. We always carry a serial-to-USB adapter and have had to do remote configuration over the phone more than once.
• Power supply cabling distance (16 feet @ 22 AWG, 33 feet @ 18 AWG) is relevant if the CCU and power supply are in different closets or on different floors. Voltage drop is real; use the spec sheet to verify cable gauge for your run length, and always measure AC input at the CCU to confirm it's within 22–26V DC (nominal 24V).
• The AX Series is mature and stable, but integrator support is concentrated in the Aiphone legacy base. If your firm is primarily IP/SIP-focused, commissioning and troubleshooting can be slow if you hit an edge case. Partner with an Aiphone direct technician on large or complex deployments.

The AX-248C is the right choice for retrofit/expansion of existing AX Series installations, multi-tenant office properties where analog intercom is standard, and campuses where simplicity and long-distance Cat-5e wiring economics outweigh IP integration complexity. For new greenfield deployments or properties heavily invested in IP access control and cloud management, evaluate SIP-native intercoms before defaulting to this hub. See the Aiphone catalog for compatible door stations, master handsets, and power supply options.