This technology is best
suited for smaller isolated networks with simple point-to-point or static OADM setups
such as low-cost interconnection routers/switches in large campus settings.
Optical Ethernet Interfaces
Another crucial area that has seen much progress is Ethernet interface designs. Here,
the most remarkable outcome has been Ethernet??™s continual ability to adapt and expand
over multiple physical media dependent (PMD) sublayers. Most notably, optical
Ethernet interfaces have played a vital role in propelling the technology into a converged
LAN-MAN-WAN solution. Current standards support a full range of speeds??”
10 Mbps??“10 Gbps??”and retain crucial interoperability with a vast installed Ethernet
base (the interfaces are summarized in Tables 8-3 and 8-4). More importantly, the recent
specification of SMF- and DWDM-based interfaces has paved the way for genuine
interoperability across DWDM optical networks.
Interface Fiber Type Frequency Reach Applications
10G Base-SR MMF Serial 850 nm 26??“300 m Campus, data center
10G Base-SW MMF Serial, OC-192c 850 nm 26??“300 m Campus, data center
10G Base-LRM MMF Serial 850 nm 300 m Campus, data center
10G Base-LR SMF Serial 1310 nm 2??“10 km Metro, storage networks
10G Base-LW SMF Serial, OC-192c 1310 nm 2??“10 km Metro, storage networks
10G Base-ER SMF Serial 1550 nm 2??“40 km Metro, storage networks
10G Base-EW SMF Serial, OC-192c 1550 nm 2??“40 km Metro, storage networks
10G Base-LX4 MMF Parallel 1310 nm 30??“300 m LAN, data center
10G Base-LX4 SMF Parallel 1310 nm 240 m??“10 km LAN, data center, metro
Nomenclature
10 G-Base xyz
x- S (short, 850 nm) y - R (LAN serial) z - # channels
L (long, 1310 nm) W (WAN, OC-192c)
E (extra long, 1550 nm) X (LAN)
TABLE 8.
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