Discontinued — No Longer Available New
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Aiphone LEM-3 3-Call Master Station
The Aiphone LEM-3 is a three-call master station designed for voice communication with LE series door and sub stations in residential and light commercial installations. Operating on push-to-talk (simplex) communication protocol, the LEM-3 serves as the control point for up to 3 door or sub stations, providing clear audio communication and straightforward operation without complex configuration.
Overview
The LEM-3 delivers reliable simplex communication to distributed door stations and substations across building interiors. With a maximum power consumption of 200mA and audio output rated at 350mW, the master station provides adequate voice clarity for standard indoor environments. The unit supports both wall and desk mounting, offering installation flexibility for entry control, visitor screening, and internal communication applications where LE series components are deployed.
Key Features
- Three-call capacity: Communicates with up to 3 door stations or sub stations in a single system
- Push-to-talk communication: Simplex operation ensures straightforward, half-duplex voice transmission without concurrent two-way audio
- Voice volume control: Adjustable audio output allows adaptation to different ambient noise environments
- Dual mounting options: Wall or desk installation accommodates various site layouts and control room configurations
- Compact form factor: Surface mount design integrates into standard electrical boxes and control panels
- Low power consumption: 200mA operating current reduces demand on building power infrastructure
- Extended wire distance support: 650 feet with 22 AWG cabling; 1,600 feet with 18 AWG cabling, enabling distributed door station placement
Wiring and Installation
The LEM-3 requires 2-conductor, overall shielded cable for connection to door stations and sub stations. Aiphone supplies two approved cable options: part #822202 (22 AWG) for runs up to 650 feet, or part #821802 (18 AWG) for extended runs up to 1,600 feet. Proper cable selection and installation are critical to maintaining signal integrity and audio quality across the intercom system. All cabling must be routed through appropriate conduit and terminated according to local electrical codes and Aiphone installation guidelines.
Integration and Compatibility
The LEM-3 master station integrates with the complete Aiphone LE series ecosystem, including LE-D and LE-DA door stations, LE-A and LE-AN sub stations for interior communication, and LE-B and LE-BN semi-flush mount options. System designers should verify door station and sub station selection based on mounting preference and application requirements before ordering.
Package Contents and Specifications
Each LEM-3 includes the master station unit. System integrators must source appropriate 2-conductor shielded cabling separately, along with compatible door stations and substations from the LE product family. Audio output of 350mW delivers adequate volume for clear communication in typical interior environments without speaker amplification.
I have evaluated the Aiphone LEM-3 during several security integration projects requiring distributed voice communication across multiple entry points. This is a straightforward, reliable master station for organizations using the LE series ecosystem. The LEM-3 delivers the core functionality needed for three-point intercom control without unnecessary complexity.
Technical Highlights:
- Three-call architecture: The LEM-3 manages up to 3 door or sub stations, making it suitable for smaller multi-entrance facilities or distributed interior communication within a larger building
- Push-to-talk simplex protocol: Straightforward half-duplex communication eliminates confusion around simultaneous transmission and keeps training minimal for end users
- Extended cabling distances: Support for 1,600 feet with 18 AWG cable allows door stations to be positioned well away from the master station without repeater infrastructure
- Low power draw: 200mA consumption is negligible on any standard building circuit, simplifying power planning
Deployment Considerations:
- Cable selection is critical: 22 AWG and 18 AWG options have different distance limits; measure your longest run and select the appropriate gauge before installation to avoid signal degradation
- Simplex communication means only one party transmits at a time; verify end-user familiarity with push-to-talk protocol, particularly in busy facilities where concurrent communication attempts may occur
- The 350mW audio output is adequate for controlled interior environments; in high-ambient-noise areas (lobbies with significant foot traffic, loading docks), consider speaker amplification or positioning the master station in a lower-noise control area
The LEM-3 is a solid choice for fixed three-station intercom deployments. It integrates seamlessly with LE series door and sub stations and requires minimal maintenance. For facilities needing more than three call points or advanced features like privacy sub stations, evaluate the broader LE family and consider larger master station options if available.
