Do fiber ports auto-negotiate their data rates with connected equipment?
Normally, only twisted pair ports can auto-negotiate data rates because fiber ports can only operate properly at the wavelength for which they are designed (850 nm or 1300 nm). Contemporary Controls fiber ports (with one exception discussed below) are fixed at the highest possible data rate. However, the new ANSI/TIA/EIA-785 standard known as 100BASE-SX includes an auto-negotiation scheme (similar to that of 100BASE-TX ) for fiber ports. The standard defines a short-wavelength fiber modality for either 10 Mbps or 100 Mbps. Although Fast Ethernet can propagate via 850 nm fiber for only 300 m, this is still quite adequate for many industrial applications. The Contemporary Controls EIMC-10T/F miniature media converter provides auto-negotiation on both copper and fiber ports. A pair of these units, can establish a transparent fiber link between two auto-negotiating copper nodes, if the fiber length complies with the 100BASE-SX distance restriction.
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