On 4/19/24 10:08, Saku Ytti wrote:
Of course there are limits to this, as FEC is hop-by-hop, so in
long-haul you'll know about circuit quality to the transponder, not
end-to-end. Unlike in wan-phy, OTN where you know both.
Technically optical transport could induce FEC errors, if there are
FE
On Sat, 20 Apr 2024 at 10:00, Mark Tinka wrote:
> This would only matter on ultra long haul optical spans where the signal
> would need to be regenerated, where - among many other values - FEC would
> need to be decoded, corrected and re-applied.
In most cases, modern optical long haul has a t
On 4/20/24 13:25, Saku Ytti wrote:
In most cases, modern optical long haul has a transponder, which
terminates your FEC, because clients offer gray, and you like
something a bit less depressing, like 1570.42nm.
This is not just FEC terminating, but also to a degree autonego
terminating, like
On Sat, 20 Apr 2024 at 14:35, Mark Tinka wrote:
> Even when our market seeks OTN from European backhaul providers to extend
> submarine access into Europe and Asia-Pac, it is often for structured
> capacity grooming, and not for OAM benefit.
>
> It would be interesting to learn whether other ma
On 4/20/24 13:39, Saku Ytti wrote:
Oh I don't think OTN or WAN-PHY have any large deployment future, the
cheapest option is 'good enough' and whatever value you could extract
from OTN or WAN-PHY, will be difficult to capitalise, people usually
don't even capitalise the capabilities they alread
On 4/20/24 13:39, Saku Ytti wrote:
Oh I don't think OTN or WAN-PHY have any large deployment future, the
cheapest option is 'good enough'...
And what we find with EU providers is that Ethernet and OTN services are
priced similarly. It's a software toggle on a transponder, but even
then, Et
LAN PHY dominates in the US too. Requests for WAN PHY were almost exclusively
for terrestrial backhaul extending off of legacy subsea systems that still
commonly had TDM-framed services. It’s been a couple of years since I’ve been
in optical transport directly but these requests were essentially
On 4/20/24 14:41, Dave Cohen wrote:
LAN PHY dominates in the US too. Requests for WAN PHY were almost exclusively
for terrestrial backhaul extending off of legacy subsea systems that still
commonly had TDM-framed services. It’s been a couple of years since I’ve been
in optical transport di
hey,
That said, I don't expect any subsea cables getting built in the next 3
years and later will have 10G as a product on the SLTE itself... it
wouldn't be worth the spectrum.
10G wavelengths for new builds died about 10 years ago when coherent
100G became available, submarine or not. Putti
On 4/20/24 18:19, Tarko Tikan wrote:
10G wavelengths for new builds died about 10 years ago when coherent
100G became available, submarine or not. Putting 10G into same system
is not really feasible at all.
I was referring to 10G services (client-side), not 10G wavelengths (line
side).
Erm, WAN-PHY did not extend into 40G because there was not much
of those STM-256 deployment? (or customers didnt wanted to pay for those).
WAN-PHY was designed so people could encapsulate Ethernet frames
right into STM-64. Once world moved out of SDH/SONET stuff, there was
no more need for WAN-PHY
On 4/20/24 21:36, b...@uu3.net wrote:
Erm, WAN-PHY did not extend into 40G because there was not much
of those STM-256 deployment? (or customers didnt wanted to pay for those).
With SONET/SDH, as the traffic rate increased, so did the number of
overhead bytes. With every iteration of the da
On Sun, 21 Apr 2024 at 09:05, Mark Tinka wrote:
> Technically, what you are describing is EoS (Ethernet over SONET, Ethernet
> over SDH), which is not the same as WAN-PHY (although the working groups that
> developed these nearly confused each other in the process, ANSI/ITU for the
> former vs
On 4/21/24 08:12, Saku Ytti wrote:
Key difference being, WAN-PHY does not provide synchronous timing, so
it's not SDH/SONET compatible for strict definition for it, but it
does have the frame format. And the optical systems which could
regenerate SONET/SDH framing, didn't care about timing, th
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