hex0101 Echo cancelation, seems to have worked.
How is echo cancellation working on “legacy” amps that don’t have echo cancellation and how are they using 200-300mhz for upstream with low split diplex filters?
This demo would only work if there were no legacy active devices between the RPD and the modem.
[edit] Ahh, an important part was left out of the quote from the article
WinDBreak, which runs a handful of small systems in Wyoming and Nebraska, conducted an FDX-style test last summer at CableLabs. To pull it off, WinDBreak replicated its Lyman, Nebraska, cable plant on a baker’s rack outfitted with the same amount of cable, taps and amps that are currently in the field, and carted it all to the CableLabs facility in Louisville, Colorado. There, the replicated system was tested with a Harmonic FDX node and relatively new non-directional amplifiers from Technetix designed to let operators flexibly allocate how much spectrum to apply toward upstream and downstream traffic in a given swath of bandwidth.
WinDBreak’s Lyman system is nowhere near state-of-the-art. Designed in the mid-1980s, it’s currently built to 450MHz, but is running at only 350MHz due to the limitations of the legacy amps, explained WinDBreak President Bill Bauer.
They replaced the legacy actives in the 350Mhz demo system. That isn’t a 350Mhz system anymore at that point, it’s at least 450Mhz (the rating of the passive devices), but can probably run much higher, closer to 750Mhz I bet.
Moffetts How the heck are they providing analog TV with a midsplit and 1gb/200mb on 350 mhz?
The WinDBreak website: https://www.windbreak.com/packages.php
50 analog channels would use 54-384 Mhz of spectrum. Mid-split would wipe analog channels up to 108 Mhz so they couldn’t use channels 2-6 or 95-97.
On theWinDBreak site, Lyman looks like the only one running midsplit to support the 1Gx200M tier and it also has symmetrical lower tiers, but it’s only running analog channels 7-30 which is from 174-264Mhz. That would allow upstream from 5-85Mhz, downstream from 108-174Mhz (11 QAMs) and 264-350+Mhz (at least 15 QAMs), with 23 analog channels in the 174-264Mhz range.
26 QAMs at 38Mbps each is 988 Mbps. It’s above the 1Gbps port speed (which is usually around 940mbps) on the modems. No wonder they have data caps.
