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Brian Carlton
Asked: 2011-02-09 12:45:04 +0800 CST

Will 1000BASE-LX autonegotiate to work with 100BASE-FX

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We have existing equipment that uses 100BASE-FX (multi-mode fiber). Will it work with 1000BASE-LX (also multi-mode) through autonegotiation? Virtually everything I found on the web about autonegotiation was for copper interefaces.

This question is different from this which covers the fiber.

EDIT: 2/8/11: changed gigabit to -LX so both are 1300 nm.

ethernet fiber

2 Answers

  1. The optical wavelengths of the two standards you mentioned, 100Base-FX and 1000Base-SX, are incompatible with each other.

    100Base-FX uses a 1300 nm near-infrared (NIR) light wavelength, while 1000Base-SX uses a 770 to 860 nanometer, near infrared (NIR) light wavelength.

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  2. Best Answer

    No, not by design, though it wouldn't be hard to design a NIC/module that could handle both but you'd need to let us know what equipment is at the gig end to allow us to help you on that.

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