The GE Security IFS D7120WDMB is a high-performance optical Ethernet transceiver designed for the transmission of 10/100 Mbps data over fiber optic cabling. This module is part of the IFS (Industrial Fiber Systems) product line, specifically engineered for demanding environments where electromagnetic interference (EMI) or long-distance transmission makes traditional copper cabling impractical. The GE Security D7120WDMB utilizes Wave Division Multiplexing (WDM) technology, allowing it to both transmit and receive data over a single strand of multimode fiber.
Technical Specifications and Datasheet
-
Model Number: D7120WDMB
-
Brand: GE Security / IFS
-
Data Rate: 10/100 Mbps (Auto-negotiating)
-
Fiber Type: Multimode (Single Strand)
-
Optical Wavelength: 1310nm / 1550nm (WDM)
-
Connectors: 1 x RJ-45 (Ethernet) and 1 x ST or SC (Optical)
-
Transmission Distance: Up to 2 km (1.2 miles)
-
Operating Temperature: -40°C to +74°C (Industrial Grade)
-
Input Power: 12V DC @ 200mA
-
Enclosure: Standalone or Rack-Mount (compatible with IFS card cages)
-
MTBF: >100,000 hours
Application Fields
The D7120WDMB is primarily used in critical infrastructure monitoring, including IP-based CCTV surveillance, perimeter security systems, and traffic signal control. Because it is hardened for extreme temperatures, it is frequently installed in outdoor NEMA enclosures for roadway monitoring and at remote utility substations. Its ability to provide electrical isolation through fiber optics makes it an excellent choice for environments with high lightning risk or industrial noise that would typically degrade signals on UTP copper cables.
Product Instructions
For proper operation, the D7120WDMB (typically the “B” end) must be paired with a corresponding “A” end unit (D7120WDMA) to ensure the WDM wavelengths are correctly matched for bi-directional communication. The module can be used as a standalone device powered by a 12V DC supply or inserted into an IFS rack-mount chassis. When connecting the fiber, ensure the ST/SC connector is clean and free of dust. The RJ-45 port supports Auto-MDI/MDI-X, so both straight-through and crossover cables can be used to connect to a switch or camera. Check the “Link” and “Activity” LEDs on the front panel to verify that both the copper and optical connections are established.
Common Questions and Answers
Q: Why do I need a “WDMA” and “WDMB” version to make a link? A: WDM technology uses two different wavelengths (1310nm and 1550nm) to transmit and receive on one fiber strand. The “A” unit transmits at 1310nm and receives at 1550nm, while the “B” unit (this model) does the opposite. Without the correct pair, the units will not be able to communicate.
Q: Can this unit be used with Single-Mode fiber? A: This specific model is designed for Multimode fiber. While a signal might physically pass through a Single-Mode cable over very short distances, the optical budget and core diameter mismatch will likely result in high signal loss and unreliable communication.
Q: Is this transceiver compatible with PoE (Power over Ethernet)? A: The D7120WDMB is a data-only transceiver. It does not provide PoE power to connected devices like IP cameras. If your camera requires PoE, you will need a separate PoE injector between the transceiver and the camera.
Recommended Similar Models
-
GE Security IFS D7120WDMA (Complementary “A” unit)
-
GE Security IFS D7130 Series (Gigabit Ethernet version)
-
GE Security IFS D9100 Series (Video + Data over Fiber)
-
GE Security IFS DE7200 Series (Industrial Switch)
-
GE Security IFS MC-2FX (Media Converter)
