On 5/29/19 3:53 PM, Mitcheltree, Harold B wrote:
https://www.ekinops.com/products/flexrate-modules/aggregation-and-encryption...
I'm not sure I see how this particular product resolves the concern I expressed. Yes, it will aggregate native subrate services at 10Gbps or 40Gbps native line rate up onto 100G OTN (on OTU4), and it can (presumably) do that without packet switching using either 1:1 frame mapping using GFP-F or straight cut-through stream mapping with GFP-T or similar. What it doesn't appear to do, and where my concern lies with the OP's desires surrounding OTN, is take a "fractional" 100Gb service and aggregate it up with other services onto an OTU4. "Fractional" here means that the committed/available throughput is something less than the native line rate which is what OP appeared to be asking for ("'fractional 100GbE' e.g. starting with 30-60Gbps commit"). The only way I know to do this is to packet switch, as either Ethernet or GFP-F OTN traffic, the subscriber data onto a FlexODU at the desired subscriber rate within the OTU4. Other traffic could then be placed within the same OTU4 using the normal OTN TDM mechanisms including subrate (e.g. 10Gbps) traffic that might NOT require packet switching since it could be re-framed/re-transmitted onto the OTU4 at its native line rate. I don't see any reason you can't do this, though I know of no equipment that will off hand, and it will incur some latency and jitter due to the packet switching which OP seemed to want to avoid. You'd still get the benefits of FEC, enhanced monitoring, etc. from the OTN side of things, and the latency and jitter should be generally better than switching it onto a higher-rate native Ethernet even if the high-rate side is not oversubscribed. It should certainly be no worse. The crux of this is what happens when you have a subscriber service who's native line rate exceeds the provisioned OTN throughput which is a scenario OP alluded exactly to. -- Brandon Martin