A transceiver must match the switch interface, data rate, fiber type, wavelength, connector, and link budget. The label SFP or SFP+ describes the form factor, not universal interoperability.
Match the electrical interface
Confirm that both network devices support the intended speed and transceiver coding. Some ports accept both 1 Gb SFP and 10 Gb SFP+ modules, while others do not; vendor firmware may also warn about or reject third-party optics.
- Use 1000BASE-SX or LX for supported 1 Gb links.
- Use 10GBASE-SR or LR for supported 10 Gb links.
- Do not assume an SFP+ module will negotiate down in an SFP-only port.
Match the optical path
Use SR optics with compatible multimode fiber and LR optics with single-mode fiber unless the equipment documentation states otherwise. Both ends must use compatible wavelengths and rates, and the installed connector must match the module or an approved patching scheme.
- Calculate transmit power, receiver sensitivity, path loss, and design margin.
- Confirm duplex polarity from transmitter to receiver.
- Clean and inspect connectors before insertion; contamination is a common source of loss.
Confirm before procurement
Check the current hardware compatibility list for the exact switch model and software release. Record manufacturer, part number, coding, wavelength, distance rating, and digital diagnostic support in the bill of materials.
Field Note from GGIS
When a new optical link stays down, verify port speed, module detection, receive levels, and polarity before replacing hardware. Keep known-good matched modules and a clean patch lead for isolation testing.
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