5 and include high-end EPL services using dedicated protection (1+1
span, UPSR, and mesh protection) to more wavelength-efficient services using shared protection
(SPRING, shared mesh protection, and mesh restoration). Also note that EoWDM
EPL Type Carrier Pricing Data Rates Recovery Timescales Comments
Platinum Very high Fast Ethernet/Gigabit
Ethernet/10 Gigabit
Ethernet
< 10 ms 1+1 span, dedicated UPSR
Gold High Fast Ethernet/Gigabit
Ethernet/10 Gigabit
Ethernet
< 50 ms 1:1 span, dedicated SPRING or
dedicated mesh protection
Silver Medium Fast Ethernet/Gigabit
Ethernet/10 Gigabit
Ethernet
??? 100 ms Shared SPRING or mesh protection
Bronze Low Fast Ethernet/Gigabit
Ethernet/10 Gigabit
Ethernet
NA Nonprotected SPRING or mesh
Copper Very Low Fast Ethernet/Gigabit
Ethernet/10 Gigabit
Ethernet
NA Preemptable (1:1 span, SPRING,
mesh protection/restoration)
TABLE 8.5 Sample DWDM-enabled EPL Service Categories
Fiber and WDM 219
recovery will generally be faster??”but less selective and service aware??”than higher-layer
mechanisms such as MPLS fast-reroute, Ethernet RSTP, and RPR ring wrap-around.
Hence, careful interlayer escalation strategies will be required to prevent recovery collisions
[3].
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