MARINE TELEPHONE EXCHANGER OKI 6000 MODEL NO. OAE 6024-1 RA1164 9001 600425

1. Design & Construction:
   • Marine-Grade: Built to withstand vibration, humidity, salt spray, and temperature fluctuations common at sea.
   • Compact Cabinet: The “RA1164” likely refers to the rack or cabinet type—a standard 19-inch rack-mountable enclosure, common in shipboard equipment rooms.
   • Robust Components: Utilizes relays, discrete logic, and solid-state electronics typical of reliable industrial systems from its era (1970s-1980s).
2. Capacity & Configuration (Typical for 6024 series):
   • Extensions: The “24” in 6024 strongly suggests a capacity for up to 24 internal telephone extensions (e.g., stations 10-33).
   • Trunks/Lines: Capable of connecting to 1 or 2 external trunk lines, such as:
     • Ship-to-Shore (SSB/HF Radio): For making external calls via the radio telephone system.
     • Satellite Communication (SATCOM) Terminal: If integrated with the vessel’s satcom system.
   • Special Circuits: Includes a dedicated Emergency / Priority circuit for connecting to the bridge, engine control room, and other safety-critical phones.
3. Core Functionality:
   • Internal Dialing: Full four-digit (or two-digit) dialing between all extensions.
   • External Call Access: Dial a prefix (often ‘9’ or ‘0’) to seize an external trunk line.
   • Incoming Call Distribution: External calls can be routed to a designated operator’s phone (e.g., the radio room) or directly to specific extensions.
   • Emergency & Priority Features:
     • Bridge Priority: The bridge phone typically has pre-emptive calling privileges.
     • Emergency Ringback: Can trigger a general alarm call to all phones.
   • Basic PABX Services: Call transfer, hold, and night service modes.
4. Power Supply:
   • Operates on standard 24V DC shipboard power (with possible 110V/220V AC options via internal or external power supply).
   • Designed for stable operation with typical vessel power fluctuations.
5. Interfaces & Connections:
   • Extension Lines: Terminal blocks for connecting 2-wire analog telephone sets.
   • Trunk Lines: Terminals for connecting to the radio telephone terminal or other external line equipment.
   • Emergency Input/Output: Dry contact inputs for alarm integration and outputs for activating common audible alarms.
6. Markings Breakdown:
   • OAE 6024-1: OKI Automatic Exchange, 6000 Series, 24-extension capacity, -1 revision or variant.
   • RA1164: Rack Assembly or Chassis number.
   • 9001: Likely a manufacturer’s internal parts or batch code.
   • 600425: Probably a unique Serial Number.

Typical Applications:

• Merchant vessels (cargo ships, tankers, bulk carriers)
• Offshore supply vessels and drilling rigs
• Research vessels
• Larger fishing vessels

Product Era & Status:
This model represents mature, pre-digital marine communication technology. It is a legacy system that was renowned for its simplicity and durability. While many units have been replaced by modern IP-based VoIP systems, the OKI 6000 is still found on older vessels and is prized for its analog reliability and ease of repair with basic components.