ARG 2400 Series 2402-EQ49K-BOM G.703 DS3 Protection Switch Dual Output

ARG 2400 Series 2402-EQ49K-BOM G.703 DS3 Protection Switch Dual Output 45.368Mb/s

The ARG 2400 Series G.703 Protection Switch is a 1U rackmount unit designed to provide automatic signal protection switching for DS3 digital circuits operating at 45.368 Mb/s. It accepts two DS3 input signals (Input A and Input B) through a relay bypass module and routes them to dual DS3 outputs, ensuring continuity of the primary signal path — Input A to Output 1 continues to pass signal even under a power failure condition. A front-panel keyswitch provides manual channel override capability for operator control.

Specifications & What's Included

• Model: ARG 2400 Series — Factory Code 2402-EQ49K-BOM
• Signal Standard: ITU-T G.703
• Signal Type: DS3 (45.368 Mb/s)
• Inputs: Two DS3 inputs (Input A and Input B) via Relay Bypass Module
• Outputs: Dual DS3 outputs (Output 1 and Output 2)
• Power Fail Protection: Input A to Output 1 signal path maintained under power fail
• Channel Override: Keyswitch-operated manual channel override (keys included)
• Front Panel Indicators: PSU 1 / PSU 2 status, ALARM, RESET button, I/P A Active, I/P B Active, L.O.S. (Loss of Signal), L.F.A. (Loss of Frame Alignment), A.I.S. (Alarm Indication Signal) LEDs
• Rear Panel Connectors: Numbered BNC coaxial ports (positions 1–8), DB-15 ALARMS port, REMOTE interface port
• Power Supply: Dual redundant PSUs (PSU 1 and PSU 2); dual IEC AC inlets on rear panel
• Power Requirements: 100–250V AC, 50/60Hz (per rear label)
• Remote Management: Web Server option fitted; REMOTE interface on rear panel
• Form Factor: 1U Rackmount
• Manufacturer: ARG (UK) —
• Includes: Unit with both keyswitch keys

Applications

G.703 DS3 protection switches like the ARG 2400 Series are used in telecommunications networks to protect DS3 (T3) digital transmission circuits — 45.368 Mb/s links that carry 28 bundled T1 channels or high-speed data. They are deployed at telecom nodes, satellite ground stations, broadcast facilities, and data center interconnects where DS3 circuit continuity is critical. The protection switch monitors two input signal paths and automatically switches to the backup path if the primary fails, keeping downstream equipment connected without manual intervention. The relay bypass module ensures that even a complete unit power loss does not break the primary signal path. Units of this type were widely deployed throughout the 1990s and 2000s in satellite uplink/downlink facilities, carrier central offices, and military or government communication infrastructure requiring redundant DS3 connectivity. The keyswitch override allows operations staff to manually force a channel selection, a feature common in managed facilities where controlled maintenance windows require predictable switching behavior.