The GE VT1930WDM is a sophisticated fiber-optic transmission solution designed for the simultaneous transport of high-quality video and bi-directional data signals. Engineered for reliability in security and surveillance environments, this transmitter effectively converts analog video signals and RS-232/RS-422/RS-485 data streams into frequency-modulated (FM) optical signals. By utilizing fiber-optic technology, the device ensures signal integrity over long distances, providing immunity against electromagnetic interference (EMI) and radio frequency interference (RFI) that typically plague traditional copper-based transmission systems.
Product Specifications
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Model Number: GE VT1930WDM
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Transmission Method: Frequency Modulation (FM) over optical fiber
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Video Channels: 1 Channel (Baseband NTSC/PAL/SECAM)
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Data Channels: 1 Bi-directional channel (RS-232, RS-422, or RS-485 selectable)
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Optical Wavelength: Typically 1310 nm or 1550 nm (refer to specific unit label)
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Dimensions: Standard industrial rack-mount or standalone enclosure (Approx. 180 mm x 120 mm x 30 mm)
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Weight: Approx. 0.45 kg
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Country of Origin: United States
Key Application Areas
The VT1930WDM is widely deployed in professional surveillance and industrial monitoring systems, including:
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Large-scale CCTV security networks in commercial buildings.
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Traffic monitoring and intelligent transportation systems (ITS).
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Industrial process monitoring where high EMI exists.
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Perimeter security for critical infrastructure (power plants, airports).
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Remote PTZ (Pan-Tilt-Zoom) camera control linked to control rooms.
Operating Instructions
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Fiber Connection: Clean the fiber optic connector (ST or FC type) with an approved fiber optic cleaning tool before insertion to ensure minimal signal loss.
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Signal Input: Connect the coaxial video source to the BNC video input port. Connect the data control wires (e.g., from a keyboard or DVR) to the data terminal block, ensuring correct polarity for the chosen standard (RS-485/422).
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Powering: Connect the appropriate DC power supply. Check the status LEDs on the front panel; typically, a steady light indicates a stable power and carrier signal connection.
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Data Configuration: Use the internal DIP switches or jumpers (if applicable to the specific sub-version) to select the desired data protocol (RS-485 vs RS-232).
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Verification: Once powered, verify the video image on the receiver end. If the image is distorted, check the optical power levels and ensure the fiber path is within the link budget.
Important Usage Precautions
Optical fibers are sensitive to sharp bends; ensure that the cable radius is maintained according to manufacturer specifications to avoid signal attenuation. Do not look directly into the fiber optic output port, as laser light can be harmful to the eyes. Always ensure the system is properly grounded to protect the device from power surges, particularly in outdoor installations. Use only the specified power supply to avoid internal voltage regulation failures.
Frequently Asked Questions (Q&A)
Q: What is the maximum transmission distance? A: This depends heavily on the type of fiber used (Multi-mode vs Single-mode) and the optical budget of the specific transmitter/receiver pair. Generally, fiber systems can reach several kilometers without the need for repeaters. Q: Can this unit transmit digital video? A: No, the VT1930WDM is specifically designed for analog video formats. It will not work with SDI, HDMI, or IP-based digital camera signals. Q: How do I know if the data link is functioning? A: Most GE units include a “Data Activity” LED. If this LED flashes during camera control commands, the data link is established and active. Q: Is the data channel full-duplex or half-duplex? A: The device supports both; however, the mode must be correctly configured via internal hardware settings to match your control software and field device requirements.
