The **IS-AAD-R** (part of the Aiphone IS Series) is an IP-based, analog-to-digital (A-to-D) adaptor. Its primary function is to bridge analog sub-stations (door or master stations) into a network-based IP intercom system. --- ### ## Core Electronic Components & Architecture The device serves as a hardware interface that handles signal conversion, power distribution, and data transmission. Below are the primary electronic functional blocks: | Component Type | Function | Specifications | | :--- | :--- | :--- | | **Microprocessor/SoC** | Manages the OS and network stack. | Handles SIP protocols and data packetization. | | **A/D Converter** | Converts analog voice signals to digital data. | High-fidelity sampling for clear voice communication. | | **Power over Ethernet (PoE)** | Power regulation for the internal circuitry. | IEEE 802.3af compliant. | | **Analog Interface Port** | Connection point for analog sub-stations. | 2-wire / 4-wire proprietary connection support. | | **Relay Output** | Dry contact for external device triggering. | Typically used for door release or light control. | --- ### ### Key Technical Specifications The electronic design is optimized for low-latency audio transmission and long-term reliability in commercial environments. * **Network Interface:** 10/100 Mbps Ethernet (RJ-45). * **Audio Codecs:** G.711 (μ-law / A-law) for standard telecommunication quality. * **Signaling:** Proprietary digital protocol over IP. * **Input/Output (I/O):** * **Input:** 1 port for an analog door station. * **Output:** 1 Form C relay (24V AC/DC, 0.5A). --- ### ### Operational Workflow 1. **Analog Capture:** The unit receives an analog electrical signal from a standard door station (e.g., IS-SS). 2. **Processing:** The internal DSP (Digital Signal Processor) filters background noise and echo. 3. **Digitization:** The signal is converted into IP packets. 4. **Transmission:** Data is sent via the LAN/WAN to the IS-IPC (Exchange unit) or a PC-based Master Station. 5. **Triggering:** When a "Door Release" command is sent from the master station, the internal relay on the IS-AAD-R physically closes to unlock the door. --- ### ### Physical Installation Logic The unit is typically DIN-rail mounted or surface mounted in a secure server room or equipment closet. Because it uses PoE, it eliminates the need for localized high-voltage power supplies at the mounting point, reducing electrical interference.