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Converting a regular switch to an optical port

Optical network knowledge brief Published 11 May 2024

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

You can convert a standard Ethernet switch to connect via fiber-optic by using a fiber media converter or a switch with built-in fiber ports.

Using a Fiber Media Converter

A fiber media converter is a device that converts Ethernet (copper) signals to fiber-optic signals and vice versa, allowing your switch to communicate over fiber networks ( ). To set it up:

  1. Check Requirements: Ensure you have the correct fiber cables (single-mode or multi-mode), Ethernet cables (Cat5e, Cat6, or higher), and power for the converter ( ).
  2. Connect Fiber Cables: Plug the fiber-optic cables into the converter's TX (transmit) and RX (receive) ports. Handle fiber carefully to avoid damage ( ).
  3. Connect Ethernet Cable: Link your switch's RJ45 port to the converter's Ethernet port using a UTP cable ( ).
  4. Power the Converter: Use the included power adapter or PoE if supported. Check indicator LEDs for power and link status ( ).
  5. Optional Pairing: For long-distance connections beyond typical Ethernet limits, a pair of media converters can be used to extend the fiber link ( ).
Using SFP Modules or Fiber-Enabled Switches

Some switches support SFP (Small Form-factor Pluggable) modules, which allow direct fiber connections:

  • Insert an SFP transceiver into the switch's SFP slot.
  • Connect the fiber patch cable between the SFP module and the media converter or another SFP-enabled switch ( ).
  • Optical transceivers are hot-pluggable, so you can insert or remove them without powering down the switch ( ).
Switches with Built-In Fiber Ports

Certain switches, like the SEL-2725 or TC3240, include fiber-optic ports directly:

  • The SEL-2725 supports 100BASE-FX multimode or 100BASE-LX10 single-mode fiber, allowing direct fiber connections to other switches or network devices ( ).
  • The TC3240 includes a built-in switch with fiber ports, enabling long-distance connections up to 100 km without additional hardware ( ).
  • These switches often support auto-negotiation, duplex detection, and LED indicators for easy setup ( ).
Key Considerations
  • Fiber Type: Choose single-mode for long distances or multi-mode for shorter distances.
  • Distance: Standard Ethernet is limited to ~100 meters; fiber can extend to kilometers.
  • Compatibility: Ensure the media converter or SFP module matches the switch's speed (100 Mbps, 1 Gbps) and fiber type.
  • Power and Environment: Some industrial switches support wide voltage ranges and harsh conditions ( ).

By using a fiber media converter, SFP module, or a fiber-enabled switch, you can effectively convert a copper Ethernet switch port to an optical port, enabling high-speed, long-distance network connections.

Converting a regular switch to an optical port - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Converting a regular switch to an optical port

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Technical note

This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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