Fibre Channel SAN Extension Transport Architectures
WAN Design Metrics DWDM SONET CWDM Cost Metro Ethernet Public IP
Distance
Large enterprises are more likely to have the resources to implement optical solutions like CWDM, DWDM, and SONET/SDH, and may already have dark fibre in place. Distance –
Metro Ethernet is 60km CWDM – 120km DWDM – 250km SONET – can go a lot further because it can be regenerated. IP –
would give us the longest distance (global) and the lowest cost but at the cost of latency.
For synchronous replication the maximum recommended distance is 125km over optical extension, i.e. CWDM or DWDM.