5) Very fine
(kbps-Mbps)
Very fine
(kbps-Mbps)
Coarse
(Gbps)
Coarse
(Gbps)
QoS Support Soft/relative Hard Soft/relative Soft/relative Hard Hard
Protection 100s ms to
seconds
< 50 ms 100s ms < 50 ms Per higher
layers
< 10 ms to
100s ms
OAM support Ethernet OAM
(maturing)
SONET/SDH
OAM
(excellent)
Ethernet OAM
with MPLS
LSP ping/
trace route
(maturing)
Ethernet
OAM with
RPR ping
(maturing)
Ethernet
OAM
(maturing)
DWDM
OAM
(excellent)
TABLE 8.6 Comparison of Different Solutions for Carrier Ethernet Services
222 Chapter 8
these technologies still face many challenges in transitioning to the next TDM carrier
rate, 40 Gbps OC-768/STM-256. As such, NGS/MSPP is most germane as a grooming
solution and fundamentally cannot scale capacity??”this is only possible via multichannel
DWDM.
The native format transparency of EoWDM (and EoF) provides vital cost savings for
carriers??”particularly at 10 Gbps rates. Namely, ROADM and EDFA-based networks
can transparently move packets across large MAN domains without any intermediate
electronic packet/bit-level processing and regeneration. This allows EoF/EoWDM to
concurrently support all Ethernet line rates and keep pace with any future rate increases,
future-proofing it.
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