| BPON - 100Mbp/s = Bull Verizon's ATM based BPON has a 622down 155up max per PON port. Each PON port can support 32 customers. To get 100mb/s, they could only place six customers on a PON port... that will never, never, never happen... Their video offering is an 1550nm RF overlay on fiber using EDFA's.... what does that give you??.... the same exact thing you get from digital cable. Until they go GPON, they do not have enough IP bandwidth to do IPTV.... DSL had been around for long,long time before Verizon deployed it, but somehow that was state of the art once they had it... same with fiber PON... BPON has been around for a long time... now that they have it, it's the greatest thing since sliced bread... Think of the sick amount of money they have wasted on BPON gear, only to move to GPON in '06... you the cosumer will pay for it once the price wars are over and the Bell monopoly can go back to raping us for service... |
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| They are not suggesting 100mb/s per customer. The quote states "The current ATM-based PON can deliver up to 100 MB/s of capacity." That is 100MB/s total capacity of the node not to a single customer. Remember mb = megabit and MB = megabyte. So knowing that there are 8 bits in a byte..
622mb/s down + 155mb/s up = 777mb/s capacity of the node
777mb / 8 bits = 97.125MB/s which is close enough to 100MB/s for conversational purposes. |
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| I assure you that's not what they meant...
“GPON will offer us 10 times as much capacity as we have now,” he said. The current ATM-based PON can deliver up to 100 MB/s of capacity.
That is the article quote... dead wrong... no version of GPON is 10 times capacity of BPON... spin spin spin |
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 tschmidtPremium,MVM
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| said by bbskeptic:That is the article quote... dead wrong... no version of GPON is 10 times capacity of BPON... spin spin spin
BPON is 622/155 carried over ATM yielding useful "IP payload" of 560/140. GPON has two flavors 1.2/622 and 2.4/1.2Gbps. GPON does away with ATM eliminating the so called cell tax. Assuming Verizon is talking about 2.4 download is increased by factor of 4.2x. Upload a more dramatic 8.5.
So while there was some poetic license is was not quite as bad as it seems.
As far a delivering 100 Mbps that is not unreasonable. Data tends to be very bursty, no ISP offer non-blocking network. BPON delivers 17.5 Mbps with a 1:32 split, GPON 75. Not to shabby in my book.
GPON will make HDTV video on demand (VoD) feasible.
/Tom |
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| reply to bbskeptic
Actually I think it is what they meant and I think I demonstrated that above.
As to the issue of GPON being 10x faster, that does seem off base and I think tschmidt had a good answer to that. However, this was not in your original post and is really independent of the your original statement about the capacity of BPON. |
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