Alternatively,
EoWDM is more compelling since corporations can preclude costly fiber infrastructure
builds and instead purchase guaranteed hard-QoS EPL services for storage extension.
This approach also gives much larger geographic coverage for SAN applications. Note
that many SAN vendors also offer Fibre Channel DWDM interfaces (50??“100 km reach)
that will inevitably compete with EoWDM strategies. Nevertheless, carriers can leverage
WDM technology to transparently host both types of storage networking solutions
over metro/regional networks??”a key advantage.
Residential and Backhaul Scenarios
The growing scalability and convergence in the access space (highlighted in ???Solution
Drivers for Ethernet over Fiber/WDM???) is driving the need for bulk data backhaul.
In particular packet-video services represent a primary growth area and residential
providers are offering a very broad range of related services, for example, IP TV, videoon-
demand (VoD), personal video recorder (PVR)/playback, and so on. Now typical
broadcast quality video requires about 4 Mbps per stream, whereas higher-end DVD
quality requires about 9??“10 Mbps per stream.
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