Indoor Fiber Optic Cable Relay

Indoor fiber optic cable relays transmit relay signals or contact closures over fiber within buildings, combining flame-retardant cabling with specialized relay converters for secure and reliable control.

Indoor Fiber Optic Cables

Indoor fiber optic cables are designed specifically for use within buildings and must meet fire safety standards. They typically feature flame-retardant jackets, with options such as plenum-rated for air-handling spaces or riser-rated for vertical shafts and horizontal runs . Some indoor cables use LSZH (Low Smoke Zero Halogen) jackets to reduce toxic gas emissions in case of fire . These cables can be deployed in conduits, ducts, or cable trays, and are available in single-mode or multi-mode configurations depending on distance and bandwidth requirements .

Fiber Optic Relay Devices

Fiber optic relays, also known as contact closure converters, allow the transmission of relay signals over fiber optic links. Devices like the FRM220-CCF20 can send two independent dry relay contacts over a single fiber, while models like the FRM220-CCF40 support four contacts . These converters often include SFP slots, allowing flexibility in choosing single-mode, multi-mode, or BiDi transceivers for the fiber connection . The relay output mirrors the remote input, enabling applications such as alarm triggering, building automation, fire alarm systems, access control, and traffic signal control . Other fiber optic relay solutions, such as the S.I.Tech Model 2811/2813 or L-com fiber A/B network switches, provide high repeatability and secure signal routing for industrial or network control applications . High-speed fiber interfaces can also be integrated into protective relays for power systems, offering immunity to ground potential rise and accurate trip signaling .

Applications and Considerations

• Building Automation: Control HVAC, lighting, or security systems over long distances without electrical interference.
• Security and Access Control: Transmit alarm or gate control signals safely over fiber.
• Industrial Control: Operate pumps, motors, or traffic signals remotely with high reliability.
• Fire Safety Compliance: Ensure indoor cables meet local fire codes, especially in plenum or riser spaces .
• Distance and Bandwidth: Choose single-mode fiber for long runs and multi-mode for shorter distances. By combining flame-retardant indoor fiber optic cables with relay/contact closure converters, you can achieve secure, interference-free, and code-compliant signal transmission within buildings for a wide range of automation and control applications .