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HomePNA Achieves 320Mbps With Copper
illeism writes "Ars Techinca is reporting that the HPNA has made a significant stride in copper speed. From the article: 'The HomePNA Alliance, backers of a networking spec that works over coaxial or twisted pair wiring, has announced the release of the HPNA 3.1 specification. The big news comes in the form of a speed jump from 128Mbps to 320Mbps, which pushes it above competing networking standards HomePlug AV and MoCA (Multimedia over Coax) for the title of fastest networking tech outside of gigabit Ethernet and makes it a more attractive option for triple-play providers.'"
320Mbps over coax!
319Mbps download and 1Mbps upload for $99.99 per month.
What was wrong with gigabit ethernet?
Each run being limited to a length of 100 meters?
Qualitas edurus commercium, nullus penitus net rimor, nullus deus beneficium
You're assuming you can wire for Gig Ethernet. Many people out there have extensive installations that barely work with 100mbit. For instance the building I'm in was built in 1992 and wired for Ethernet EXCEPT (a big except) the installers stables the cabling the studs. Won't make it above 10meg and even 10 meg has errors left and right. The building had to be rewired so we could go 100Mbit, but that's 500 drops in 4 different structures with 4 wiring closets to pull back to. Stuff like this is a big deal for colleges. There's plenty of colleges that only have their internal phone lines the the rooms and are delivering internet connections via DSL technology from their closets. Schools with 2000 students on campus and sometimes in buildings on the historic registry. They REALLY want to be able to use that existing infrastructure to deliver a high speed connection.
Tim Smith - Ramblings from Nerd Land
Eh? A round trip through two HPNA 2.0 bridges adds about 2ms of latency to a packet from my empirical observations.
While I obviously wouldn't use a home networking standard for ultra performance critical networking applications, the latency of HPNA 2.0 is not something I ever perceptually notice, and I use it every day.
Uh, that's simply not correct. Analog phone is 2 wire, the audio signal is just superimposed over the DC bias, it's all done on two wires.
I've had enough abrasive sigs. Kittens are cute and fuzzy.
Many people have taken issue with your first comment, but let me take issue with the second, lest I simply parrot the masses.
The phone is actually a single massive loop, which is terminated at the phone company central office. When the phone is on the hook, a very high voltage DC potential just sits there. When the phone rings, the central office sends an AC voltage over the DC carrier wave, which actuates the ringers in the phones. When the phone is picked up, the mic and headphone piece close the DC circuit. The Central office then detects the current (Which is very small compared to the voltage because it's being sent through kilometers of phone line) and switches to "off hook" mode.
Now, the reason this is at all relevant is DSL signals also live on this set of lines. That's why you need to install line filters in your house. HOWEVER, the DSL line can't be a low resistance device like the telephone, or your phone would be off the hook whenever you plugged your DSL modem in. Since the DSL modem would have to be a high impedance device capable of sustaining the massive DC voltage mentioned earlier, I know that 24VDC wouldn't hurt a DSL modem, and even in the worst case scenario of a 120VAC line connected directly to the phone (and why exactly would phone connectors be so tiny, with so little protection from electrocution or short circuits, if a 120VAC line voltage was present?), I'm pretty sure the DSL modem still wouldn't care, since the phone ringing voltage is about 90VAC. Some day I'll have to grab an old DSL modem and test my theory regarding the 120VAC, but I don't need to regarding the 24VDC. The line voltage used to test whether a phone is off the hook or not is about twice that.
It's been a long time.