On 2/Aug/19 20:06, Etienne-Victor Depasquale wrote:
Bear with me one more time as I drill down a little and spell things out. I've realized that there may be more than one interpretation of "EoDWDM". Are you referring to:
(a) Ethernet packets in OTU frames - thereby implying an underlying OTN?
(b) Ethernet optical SFP+ transceivers with a cable connection into a transponder plugging into a DWDM Mux or DWDM OADM? (no circuit transport)
Either one would count as EoDWDM, in my book. The general use-case for OTN is to have SDH/SONET-like OAM characteristics, but over the DWDM network. In basic deployments, there was a time when folk argued about whether they take LAN-PHY or WAN-PHY EoDWDM services from providers. The OTN vs. DWDM discussion kind of falls around there, in my opinion. Considering that almost all use-cases for EoDWDM are into router ports, where basic day-to-day Ethernet is the cheapest and simplest option, I haven't heard of any customers asking for WAN-PHY or OTN in the last 3 years. Not on our network at least, anyway... I think the costs of WAN-PHY/OTN re: OAM have been outweighed by making the right choice in choosing an operator that is able to deliver an SLA, back it up, and have a NOC that works well. Now, the next step in all this that is starting to gain a bit of traction is "spectrum", i.e., rather than take a normal grey service from a Transport operator, have them deliver you a portion of the DWDM spectrum so that you can run as much bandwidth as you want over their network. Think of it as dark fibre, but lit... Mark.