© Ciena Corporation
3
40G Transmission – Current Drivers
40G IP Router interfaces
Link bandwidth requires N X 10G
Problems with link aggregation
Most flows small, distribute nicely
Large flows from MPLS/IPSEC problematic
32-40 Ch DWDM ring exhaust
Multi-access DWDM rings in metro
Typically 5 nodes, some larger
At exhaust build entire new ring
New fiber, amps, ROADMs, installation, space, power,É
Or add a pair of 40G transponders
Both of these applications support 40G transponder costs > 4X 10G transponder cost