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Alison’s Wonderland
Alison’s Wonderland
11/26/2019 4:48:27 PM
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Re: Why now?
Why now you ask, Dan? Well, don't count EPON out is what I've been hearing -- and what I've written about in an article that will appear in the next day or two. In fact, I'm tweaking it right now, with plans to post it tomorrow (Wed., Nov. 27) on BBWN. Look forward to hopefully seeing your feedback on that piece. Either way, have a wonderful Thanksgiving and thanks for responding to the most recent #BBWNFlashpoll! - Alison

11/22/2019 12:21:51 PM
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Why now?
This was a current discussion maybe about 10 years ago. The differences between IEEE 802.3 and FSAN that were never resolved got down to cost **at the time the standard was being developed** versus channel efficiency and network design constraints, along with some side issues like a mandate to re-use the Ethernet MAC, telco-style OAM or not, and tight or loose synchronization. IEEE 802.3 went with looser requirements, FSAN with stricter ones. 

What's happened is that the cost advantage that EPON once had have gone away, while GPON is still more efficient and more functional. EPON's cost advantage had a lot to do with cheaper ONU optics (but with shorter reach and smaller splits). Now it's the same optics, so cost is at parity. Shipping volume favors GPON, so I understand that GPON ONTs are priced **lower** thant GEPON ones.

IEEE 802 finished the 10G EPON standard before FSAN finished NG-PON1. In addition, 10G EPON supported symmetrical 10 Gbit/s upstream at the outset, where as NG-PON1 is 10/2.5. The reason for that is too long to explain in detail, but the result is that the 10G EPON upstream is **much** less efficient than the GPON upstreams. And again, they use the same optics.

So the GPON family is more functional and more efficient than the EPON family, while not at higher cost. There is no economic or functional reason for an operator to choose EPON.

Some of the MSOs, constituting around 2/3 of the market, decided earlier on EPON, apparently for reasons other than function or economics. They also funded CableLabs to develop a DOCSIS provisioning over EPON (DPOE) specification, which simplifies operations in a mixed HFC/FTTP system. As far as I know, that's the only real case for an EPON roadmap.  A DPOG spec was started but never finished due to lack of MSO interest.

I understand that a lot of MSOs that have deployed GEPON are now deploying XGS-PON for 10G applications.

-- Dan Grossman




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