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GE DS200LUVAG1AFD

Product Name:​ Mark V Fiber Optic LAN Interface Board (VME Bridge)
Product Introduction:​ The DS200LUVAG1AFD is the fiber optic version of GE’s Mark V LAN interface board. It replaces the standard RS-485 copper connections with two ST-style fiber ports, extending the maximum segment length to 2000 meters while eliminating ground loop problems that plague copper LAN segments in industrial substations. The “FD” suffix means Fiber Distributed.
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Technical Specifications:
  • Manufacturer:​ General Electric
  • Series:​ Mark V Turbine Control
  • Board Type:​ LAN Interface / VME Bridge
  • Part Number:​ DS200LUVAG1AFD (Revision A with FD/Fiber suffix)
  • Physical Layer:​ Fiber optic, multimode
  • Connector Type:​ 2× ST (bayonet)
  • Wavelength:​ 850 nm
  • Max Segment Length:​ 2000 meters (typical)
  • Fiber Type:​ 62.5/125 µm multimode
  • Optical Budget:​ 11 dB typical
  • Bus Interface:​ VME64
  • Watchdog:​ PIC-based, 1.6 s timeout
  • Backplane Connector:​ 3× 96-pin DIN 41612
  • Operating Temp:​ 0°C to 55°C
  • Power Draw:​ 5V @ 480 mA (transceivers add draw)
Key Advantages:​ Swapping from RS-485 to fiber can drop communication error rates from 5% to 0.01% in high-EMI environments. The 2000-meter segment length (vs. 1200 m for copper) allows for greater geographic distribution of I/O racks. Ground loop problems are completely eliminated.
Working Principle:​ Same VME backplane interface and watchdog logic as the G1A copper revision. The practical difference is the physical layer—two ST-style fiber ports replace the typical screw-terminal RS-485 connections, converting the parallel VME backplane data to serial fiber optic LAN traffic.
Application Scenarios:​ Long cable runs and high-EMI areas such as variable frequency drives or high-voltage switchgear. Particularly valuable in industrial substations where ground loops would otherwise plague copper LAN segments.
Compatible Replacements:
  • Drop-in replacement:​ DS200LUVAG1A (standard RS-485 version) — swaps directly only if LAN cabling is also changed
  • Drop-in replacement:​ DS200LUVAG1AEC (extended temperature RS-485 version) — same caveat, copper cabling required
  • Software compatible:​ DS200LUVAG1B (different watchdog timing: 1.2 s vs. 1.6 s) — physically compatible, requires firmware flash
  • Hardware incompatible:​ DS200LUVAG1 (non-fiber) — lacks fiber transceiver mounting
Installation Requirements:​ Install in Mark V VME rack. Use 62.5/125 µm multimode fiber with ST connectors. Maximum segment length 2000 meters.
Usage Precautions:​ You cannot mix fiber and copper on the same LAN segment. Each board talks to its own peer at the other end—you can have an FD board in slot 3 and a standard RS-485 board in slot 5, but they must connect to different types of LAN segments. Never look directly into the ST port with power applied—850 nm is barely visible but can cause eye damage.

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