Convert on Module 100TX to 100FX (SC)

To change a 100 BASE‑TX (copper) interface to a 100 BASE‑FX (single‑mode) interface with an SC connector, follow these steps: 1. **Confirm hardware compatibility** – Check that the device’s slot accepts pluggable optics (SFP/SFP+ or GBIC). If it only has an RJ‑45 port, you’ll need an external media converter rather than a direct swap. 2. **Select the proper optic** – Purchase a 100 BASE‑FX SFP module that terminates with an SC ferrule and matches the fiber type you’ll use (single‑mode for long runs, multimode for short runs). Verify the part number is approved for your equipment’s firmware version. 3. **Power down the device** (or place the port in a disabled state) before removing the existing TX transceiver or unplugging the RJ‑45 cable. 4. **Insert the FX module** – Align the keying notch and slide the SFP fully into the slot until it clicks. Secure any retaining clip if present. 5. **Connect the fiber** – Clean the SC connectors with a lint‑free wipe and isopropyl alcohol, then mate the SC plugs. Ensure the fiber is routed with proper bend radius and strain‑relief. 6. **Configure the port** – In the device’s management interface, set the port speed to 100 Mbps full‑duplex (if not auto‑negotiated) and enable the SFP. Save the configuration. 7. **Test the link** – Verify link lights, run a ping or throughput test, and check for errors. If the link fails, re‑inspect the fiber cleanliness, connector seating, and module compatibility. 8. **Document the change** – Record the new part numbers, serial numbers, and any firmware updates for future reference. If the device lacks a pluggable slot, install a dedicated 100 BASE‑TX‑to‑FX media converter: connect the existing RJ‑45 cable to the converter’s copper port, attach SC‑terminated fiber to the converter’s optical port, and then link the converter to your network. After powering up, repeat the testing steps to confirm a stable 100 Mbps fiber link.

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