Brandon,
Le 30/05/2019 à 03:46, Brandon Martin a écrit :
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.
You're right on spot !
What I have in mind is actually to combine line-rate ODUs with a static
mapping and pipe the uncommitted capacity to a packet-switch.
Statically commited services will be muxponded in fastpath, hence no
jitter and less latency, while the fractionnal ports use the remaining
ports, mostly for low-priority IP traffic.
Now I was assuming ODUFlex in CBR mode would allow fractionnal services
without packet switching, but mapping an ethernet service to it would
require some equivalent glue logic I guess, specifically for this case :
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.
Yup. Should it hard-drop ? Buffer ? Both are unthinkable in OTN terms
(is that a cultural thing ?). It's what packet networks are made for.
And that's why an alien device, with support for Ethernet, OTN and
programmable pipelines, could bridge the gap, allowing for a more
efficient use of optical bandwidth.
Best regards,
--
Jérôme Nicolle
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