re: Verizon Spells Out 100 Mbit/sI wonder why Verizon is upgrading to GPON, while considering WDM-PON only as a future option. At least in Korea, WDM-PON with 100M per sub is deployed today:
If the GPON / EPON vendors will keep their promises, we'll see 10G versions of these PON variants earliest in 2009. As cost is key in the access market, it will be interesting to see how the evolved WDM-PON and those upcoming TDM PON variants will then compete in cost.
re: Verizon Spells Out 100 Mbit/s> Is Korea so much different to the NA market?
Oh, come on. You know the answer to that. :)
Demand in the U.S. is probably too sparse to justify full-blown WDM-PON. Not many people need dedicated wavelengths yet, and if you believe Verizon's math (or AT&T's for that matter), even HD television won't get them there.
The WDM PON in Korea (still very small deployment) is many times the cost of GPON and has the disadvantage that the technology chosen is stuck at 100 Mb/s. To go beyond that, Technology will have to change considerably and THAT technology, while available, is unbelievably expensive (Imagine the appetite for $5000 ONTs).
And yet, there seems no pressing need for ANYONE to introduce higher rates - again as Verizon admitted (and if you ask KT you will find the same) - there is oversubscription right at the edge. Go check out the uplink from the WDM PON box (Hint: it is NOT a dedicated 100Mb/s even through the OLT). So, it is a nice story but is NOT a dedicated 100Mb/s even out of the access box.
re: Verizon Spells Out 100 Mbit/sPlease don't argue based on the current equipment cost. We all know that cost comes down with mass volume and that the WDM-PON technical/physical concept will allow for low cost equipment.
I guess if you refer to the overbooking in the OLT you mean the LG-Nortel OLT? Certainly some smart company can come up with an WDM-PON OLT that is none-blocking by design.
No, there is no low cost solution for WDM-PONs. There will have to be a new generation of thinking before such parts could exist. Have you actually thought about the components involved? If so and you think they will be cheap anytime soon, you are on something.
It is possible to build an OLT that is not oversubcribed today. Of course, nobody - including the Koreans - want to pay for it. You can do the math on your own. 500 Users @ 100 Mb/s (carry the 12...add in pi....divide by the square root of Oprah...). Yes, thats right 500 users require 50 Gb/s. Not terrible right? Of course, now go to that 25K line CO (whoops need 50 Gb/s * 500). That is why the oversubscription is present and makes the reality of this so much less important.
This is outstanding PR spin by Verizon ... all the techno phoebes want to debate WDM and other technology in Korea!!!
Verizon knows it can deliver 100 mbs to any home or business at any time with fiber. The PR spin is to make sure regulators believe that there are technology obstacles.
VZ et all need more time to build out fiber before they let the cat out of the bag on this.
The last thing VZ wants is Congress back pettaling and modifying the Comm Act.
re: Verizon Spells Out 100 Mbit/sSo, with all the capacity and flexibility that PON provides it is amazing that some folks still try to push Active Ethernet to FTTH deployments.
Ah....at least somebody else sees the point. Now, just for the math inclined out there. Imagine a days when P2P reigned. Now, use only DSL (and heck cable) to connect to the Internet backbone. Now that we would have computer to computer driven sessions instead of human to computer driven sessions, you will see the glaring need for more fiber in the backbone. Of course, nobody gets paid more money for fiber in the backbone for High Speed Internet service. They do get paid for a higher bit rate on the access port.
Of course, 100 Mbit/s has been available for a couple of years now in some European and Asian countries (roughly $50/mo in Sweden). Even 1 Gbit/s services are available in some cities. Based on regular LAN switches in the basement with CAT6 cabling to each apartment, of course.
With that model, more money is spent on cabling, but far less money on equipment. It seems a whole lot more future-proof though, I mean Verizon is talking about the next upgrade even though they just started rolling out the latest generation of gear.
If you ask me, there are two possible reasons for this: * Regulatory reasons. FTTH could easily be unbundled, PON is messy. * Operators have been fooled by vendors. It does happen, you know. PBT, anyone?
http://www.ftthblog.com/wdm-po...
Is Korea so much different to the NA market?
If the GPON / EPON vendors will keep their promises, we'll see 10G versions of these PON variants earliest in 2009. As cost is key in the access market, it will be interesting to see how the evolved WDM-PON and those upcoming TDM PON variants will then compete in cost.