3z 1000 Base-F standard. This interface preserved the minimum/maximum
Ethernet frame sizes and used 8b/10b encoding. Again, the interface leveraged transceiver
design and 8b/10b encoding formats from existing 1.0 Gbps Fibre Channel technology.
The only difference was a slightly higher clocking rate to support full gigabit data
transfers (i.e., 1.25 Gbps versus 1.06 Gbps). Specifically, two interface types were defined.
Namely, the 1000 Base-SX standard was targeted for intra-building/data-center MMF
cabling (550 m reach), whereas the 1000 Base-LX standard was targeted for larger campus
networks (MMF and 1310 nm SMF) with a range of 10 km (see Table 8.3). These were
also the first Ethernet interfaces to use laser optics with associated low-loss frequencies
of 850 nm (MMF) and 1310 nm (SMF). In addition, mode condition path (MCP)
solutions were developed to overcome modal dispersion effects over MMF, yielding
improved reach up to 2??“3 km. Nevertheless, all official Gigabit Ethernet fiber interfaces
were restricted to campus/enterprise applications such as aggregating Fast Ethernet
ports. To resolve this limitation, many vendors have developed proprietary SMF interfaces
with extended reach up to 150 km.
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