If you're paying for a dedicated phone line just to keep your elevator phone, area of refuge device, or alarm panel connected, the Viking LSD-2 Line Sharing Device gives you a smarter, safer way to share one existing analog line without compromising emergency access. The LSD-2 works by giving absolute priority to your critical emergency device. If someone is already on a call when the emergency device needs the line, the LSD-2 disconnects that call within 2 seconds and returns dial tone to the priority port immediately. Regular phones, fax machines, and modems simply receive a busy signal while the emergency line is in use. Incoming calls from specific numbers — like a fire department or central monitoring station — can be routed directly to the priority port using stored Caller ID numbers, distinctive ring detection, or quick call-back. Setup is straightforward with 6 screw-terminal connections and no complicated programming required for basic operation. This device is a practical fit for offices, apartment buildings, hotels, manufacturing facilities, and any building where emergency communication devices must have guaranteed line access — without the cost of running a second dedicated phone line. Our Expert Take: The LSD-2 is one of those behind-the-scenes devices that quietly pays for itself. In multi-tenant buildings where code requires a dedicated elevator or area of refuge phone, line sharing can be a gray area — the LSD-2 resolves that by ensuring the emergency device always wins, making it far more defensible from a safety and compliance standpoint than simply sharing a line with no priority control. The Caller ID routing feature that stores up to 12 numbers is particularly useful for facilities that need monitoring services to reach the alarm panel directly without any manual intervention. Key Features Gives true priority to emergency devices over regular phones, fax machines, or modems on a shared analog line Instantly disconnects an in-progress call on the non-priority port for 2 seconds and returns dial tone to the priority device Sends a busy signal to the regular phone port when the emergency line is in use Routes incoming calls using Caller ID (stores up to 12 numbers), distinctive ring detection, or quick call-back Option to send all incoming calls directly to the priority port Adjustable disconnect time to match your phone system requirements Bright status LED shows current operating mode at a glance Compatible with any central office line or analog PABX/KSU station port Simple 6-screw-terminal connections — no complicated programming needed for basic use Technical Specifications Power: 120VAC / 12VDC 500mA UL listed adapter (included) Talk Battery: 40V DC Connections: 6 screw terminals Maximum Stored Caller IDs: 12 Dimensions: 5.25″ x 3.5″ x 1.75″ (133mm x 89mm x 44mm) Operating Temperature: 32°F to 90°F (0°C to 32°C) Humidity: 5% to 95% non-condensing Shipping Weight: 2 lbs (0.9 kg)
