10GE LAN to WAN Conversion
Cijo Ceazer
How the conversion from 10GE LAN (10.3 G) to WAN ( 9.95 G) happens? Is
there any standardized way of doing this. Could you please explain
briefly about it. I am confused how insertion of idles and removing
them will make rate come down.
Regards, Cijo Ceazer.
Stephen
this isnt really an SDH issue since AFAICT LAN PHY is Ethernet
specific.
10G WAN PHY was invented to allow Ethernet to plug into 10G SDH pipes
for "stuff" which didnt believe in LAN PHY.
On some IP switches there is a huge uplift in price for WAN PHY which
is why LAN PHY gets asked for sometimes.
>
on the DWDM kit at work you either use a different card for each rate
or you program the flavour you want to use per lambda, depending on
the equipment. But they do not interwork.
>Regards, Cijo Ceazer.
--
Regards
stephe...@xyzworld.com - replace xyz with ntl
Huub van Helvoort
You wrote:
> How the conversion from 10GE LAN (10.3 G) to WAN ( 9.95 G) happens?
!0GBASE-R (LAN PHY) an 10GBASE-W (WAN PHY) are defined in
IEEE 802.3ae. In figure 51-1 you can see that both can be
interconnected at the PCS layer.
The clockrate of the 10GBASE-W is reduced to fit it into
an SDH VC-4-64c. The 10GBASE-W is in fact an attempt to
create a simplified STM-64 signal.
10GBASE-W is not widely deployed.
The 10GBASE-R can be transported in SDH by using GFP-F mapping,
however this requires a VC-4-66v for the transport.
In this case GFP-Idle frames are used for rate adaptation.
For OTN a different mapping is used. Transcoding is used to
reduce the bit rate of the signal.
Cheers, Huub.
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Huub van Helvoort
You wrote:
>> How the conversion from 10GE LAN (10.3 G) to WAN ( 9.95 G) happens? Is
>> there any standardized way of doing this. Could you please explain
>> briefly about it. I am confused how insertion of idles and removing
>> them will make rate come down.
>
> this isnt really an SDH issue since AFAICT LAN PHY is Ethernet
> specific.
Both LAN PHY and WAN PHY are defined by IEEE (802.3ae).
> 10G WAN PHY was invented to allow Ethernet to plug into 10G SDH pipes
> for "stuff" which didnt believe in LAN PHY.
No it was designed to make it possible to transport Ethernet signals
over the SDH network in an "easy" way.
> On some IP switches there is a huge uplift in price for WAN PHY which
> is why LAN PHY gets asked for sometimes.
WAN PHY is not deployed much because it has some flaws, the major one
is the clock accuracy.
> on the DWDM kit at work you either use a different card for each rate
> or you program the flavour you want to use per lambda, depending on
> the equipment. But they do not interwork.
They do not interwork at the optical layer because of the difference
in frame format and bit-rate. They can interwork at the PCS layer.
Steinar Haug
> > is why LAN PHY gets asked for sometimes.
>
> WAN PHY is not deployed much because it has some flaws, the major one
> is the clock accuracy.
On the other hand, some of us like WAN PHY because it can give us the
SDH OAM functionality we know and love (AIS etc), *and* because there
is still WDM equipment around that can transport WAN PHY but cannot
handle LAN PHY.
Steinar Haug, Nethelp consulting, sth...@nethelp.no
Huub van Helvoort
You wrote:
>>> On some IP switches there is a huge uplift in price for WAN PHY which
>>> is why LAN PHY gets asked for sometimes.
>> WAN PHY is not deployed much because it has some flaws, the major one
>> is the clock accuracy.
>
> On the other hand, some of us like WAN PHY because it can give us the
> SDH OAM functionality we know and love (AIS etc), *and* because there
> is still WDM equipment around that can transport WAN PHY but cannot
> handle LAN PHY.
I agree, and if you do not mind getting an occasional excessive
pointer justification fault report (or turn reporting off), it is
a good way to transport 10G Ethernet with transport QoS.
Med vennlig hilsen, Huub.