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stephencooke
stephencooke
12/5/2012 | 4:04:12 AM
re: Optical Solutions Wins FTTP Contract
optical Mike,

I guess you must be with Calix sales and/or marketing...

Can your product(s) do the full sentence (ie: "Unless a downloadable software upgrade can transform CPE from BPON - GPON - GEPON - WPON, etc.")?

The point is that there are too many flavours to risk a multi-billion dollar network upgrade on for most carriers. Good Luck with it though.

Steve.
paolo.franzoi
paolo.franzoi
12/5/2012 | 4:04:12 AM
re: Optical Solutions Wins FTTP Contract

Stephen,

I think you are making a mountain out of a molehill. The large US carriers already have a standards body that they dominate with FSAN. NTT is deploying EPON in volume.

These carriers have already decided they can't wait forever to do something. I am not sure why you want to post FUD here. There are certainly detailed technical arguments about the merits of one standard over another, but at the end of the day they are relatively immaterial to the end decision to deploy an FTTH architecture.

seven
optical Mike
optical Mike
12/5/2012 | 4:04:11 AM
re: Optical Solutions Wins FTTP Contract
Steve,
Yes I am from Calix but not marketing or sales I am a Systems Test Engineer previously from Optical Solutions

Mike
derac
derac
12/5/2012 | 4:04:09 AM
re: Optical Solutions Wins FTTP Contract
GPON is more efficient than an EPON when running GEM mode. GEM is essentially GFP over PON. Its nice and works well for Ethernet transport. GPON in traditional ATM mode is no different that APON/BPON and carries all of the ATM overhead and inefficiencies and is much less efficient than EPON for Ethernet transport.

The Ethernet protocol legacy was carried over to EPON for a number of reasons. Probably the most important reason is that it allows vendors to use standard Ethernet pieces when building EPON chips/ONU. This has allowed for relatively inexpensive EPON ONUs. In Japan the EPON ONU price is under $100.

As always, Ethernet is less efficient but cheaper than ATM based systems. In addition, GPONs attempt to resolve everyone's problem has made it overly complicated and, at least initally, more expensive. Pick your poison.
derac
derac
12/5/2012 | 4:04:08 AM
re: Optical Solutions Wins FTTP Contract
It isn't an optical issue. BPON and GPON can operate at 622 mbps. BPON and GPON protocols are different and don't interoperate. The ONU may be able to autodetect but speed isn't the deciding issue. How does the ONU know what protocol is being used or it is really a BPON ONU that can be 'upgraded' to a GPON ONU at some point in the future ? In that case it is FPGA based and seriously overpriced for significant telco deployment.
stephencooke
stephencooke
12/5/2012 | 4:04:06 AM
re: Optical Solutions Wins FTTP Contract
Seven,

I guessed that you were a former Lucent guy a long time ago but I didn't realize that you were a PON guy until just now. I'm so slow. You were always the first to trash DSL-based ideas and you accuse me of FUD over a straightforward PON question.

I guess I'll be able to guage your bias a little better from now on.

Steve.
paolo.franzoi
paolo.franzoi
12/5/2012 | 4:04:04 AM
re: Optical Solutions Wins FTTP Contract

Stephen,

I have never worked at Lucent.

I have acused you of FUD, because you have said carriers have no method of making a decision on how to choose technology. Of course, there are 2 large buildouts going on. I am confused on why you would throw out all this confusion around standards for the two customers who already seem to know what they want. They both belong to a common standards body (FSAN) and are driving idea.

At the end of the day, the choice of line protocol is like which version of Linux you buy. It is more religious than it is absolute.

Better rethink things.

seven
nwave
nwave
12/5/2012 | 4:03:44 AM
re: Optical Solutions Wins FTTP Contract
fiber_r_us your calculations are off

Worst case (for minimum 64-byte packets):

(64 + 8 + 12) / 64 = 31.25%

It should be (8+12)/(64+8+12) = 23.81%

Best case (for maximum standard, not jumbo, 1518-byte packets):

(1518 + 8 + 12) / 1518 = 1.32%
It should be (8+12)/(1518+8+12) = 1.30%

With a real traffic mix, the overhead is somewhere around 3% - 5%
Yao
Yao
12/5/2012 | 1:12:50 AM
re: Optical Solutions Wins FTTP Contract
Sounds like either/or rather than both/and
issey
issey
12/5/2012 | 1:12:49 AM
re: Optical Solutions Wins FTTP Contract
Is both.. GE-Pon..
Giga-Bit Ethernet PON !
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