10/100Mb/sec Ethernet interoperability - fibre to the desktop

摘要

The move from Ethernet to Fast Ethernet is simplified on twisted pair through the use of Physical Layer (PHY) silicon which automatically negotiates between 10Mb/sec and 100Mb/sec data rates. The same is not true for fibre optic Ethernet. IEEE 802.3 10Mb/sec fibre optic Ethernet, referred to as 10BASE-FL, operates exclusively on 850nm optics. 100Mb/sec Ethernet, or 100BASE-FX, is based upon the FDDI Physical Layer Medium Dependent (PMD) standard and operates on 1300-nm optics.