The 33 state attorneys general who are suing Meta for deceptive and unlawful practices make a lot of interesting points in their 233-page complaint (PDF link in page):
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@jonathankoren You can get up to 33.6 kbps with analog phone lines at both ends.
I believe the downlink speed (digital to analog direction) was limited to 53 kbps in the USA due to power limits (of the analog signal, I guess).
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P [email protected] shared this topic
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@[email protected] @[email protected] I mean hell nowadays if you don’t mind some digital modulation you can get megabit speeds over twisted pairs (VDSL2 https://en.wikipedia.org/wiki/VDSL) which is how I’m typing this. I have two bonded phone lines providing me about 100mbps of download when it’s all said and done. of course you know back with 56k modems you didn’t exactly have access to the same sort of digital logic we have now (and especially not the sort of compactness either)
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@[email protected] @[email protected] it’s interesting to note that bell labs was responsible for doing some digital modulation (I think they reached gigabit speeds?) I don’t remember though.
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@[email protected] @[email protected] digital signal processing and analog signal processing are like comparing our modern tools made from tool steel and materials like tungsten carbide to the Stone Age
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@puppygirlhornypost2 @jhamby the 2400 baud limit idea comes from my memory of a lecture almost 30 years ago.
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@puppygirlhornypost2 @jonathankoren
I had AT&T U-Verse fiber-to-the-curb in 2009 that was quite impressive, but that's only traveling a short distance. I didn't realize phone company DSL could go that fast.
I'm sure most people are unaware that a selling point of 10BaseT was that you could run it over two pairs of UTP that your office building installed to use for phone lines. I assume that trick doesn't work for gigabit.
Gigabit needs 4 pairs (vs. 2). I wonder if it works over phone wiring.
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Amberreplied to jonathankoren™ last edited by [email protected]
@[email protected] @[email protected] mine comes from an offhand comment regarding bell labs so I am not sure its accuracy. Gigabit sounds like a stretch but considering we can do terabits in the lab it’s entirely possible. Could have required some very specific equipment or something else making it infeasible. I mean my home internet gets megabits out of phone lines buried in the 1970s (or earlier - hard to date those but we have signs from the original bell and AT&T just plasters over with labels the current subdivision and who to contact)
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@[email protected] @[email protected] which still I mean all things considered 100mbit is still a very respectful speed and it’s even more impressive that this is just 2 analog phone lines
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@puppygirlhornypost2 @jonathankoren
In my day job, I'm working on an avionics app server + Ethernet switch + cell modem + Wi-Fi. I've learned more about Ethernet than I ever wanted to know, as well as about avionics protocols like ARINC 429 and ARINC 717.
Thankfully this application doesn't need AFDX, which is the special customized version of Ethernet with guaranteed delivery and redundancy.
https://en.wikipedia.org/wiki/Avionics_Full-Duplex_Switched_Ethernet
I believe the AFDX switches in Boeing 787's need rebooting every 51 days.
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@puppygirlhornypost2 @jonathankoren
"The US [FAA] has ordered Boeing 787 operators to switch their aircraft off and on every 51 days to prevent what it called "several potentially catastrophic failure scenarios" – including the crashing of onboard network switches.
The airworthiness directive, due to be enforced from later this month, orders airlines to power-cycle their B787s before the aircraft reaches the specified days of continuous power-on operation.
https://www.theregister.com/2020/04/02/boeing_787_power_cycle_51_days_stale_data/
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@[email protected] @[email protected] that’s insane.
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@puppygirlhornypost2 @jhamby but it works*!
[*] For appropriate definitions of “works”
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@jonathankoren @puppygirlhornypost2
This is what happens when you try to use new-fangled proprietary technology instead of good old-fashioned 1970's protocols.
The new product I'm working on is really cool, and I'll be excited to see it in use when we ship it to airlines. The feature set is called AID: Aircraft Interface Device, and it talks to EFB (electronic flight bag) apps running on either an iPad or a more expensive and laggier permanently-installed tablet.
https://www.bytron.aero/aviation-news/what-is-an-aircraft-interface-device
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@puppygirlhornypost2 @[email protected] @[email protected] It's Boeing, do you honestly expect anything less?
