Please create an account to participate in the Slashdot moderation system


Forgot your password?
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Comment Re:All things considered... sortof... (Score 1) 147

If you are not sitting within 1.5 picture heights of the screen, you won't see the 4K detail anyway.

This means if you hold your arm outstretched, make a fist but leave your thumb up, your need to be able to fit you palm/thumb twice into the angle subtended by the screen.

Comment Re:So many problems... (Score 1) 326

Dosing is a big issue. Huge. Not just determining the correct dose but mechanically and reliably administering the correct dose. This is NOT a trivial concern. Both under and overdosing with epinephrine can be a very serious matter.

The truth is that amateur use of an EpiPen has dosing all over the place. The FDA shot down an EpiPen competitor device for just that reason, but in fact the EpiPen itself has these issues. Where the needle ends up is very important, and proper placement, angle, and even how much fat you have can change the delivered dose. A trained doctor with a syringe will do a better job, but of course it is harder to put a doctor in your bag and walk around with it.

Comment Re:NORAD knows (Score 1) 274

Re-entry predictions of uncontrolled satellites are not very certain. We can say for sure what track the re-entry will occur on (generally the orbital track), but where on that track is far less certain.

Even predictions issued 3 hours before re-entry may be affected by an along-track uncertainty of 40,000 km (i.e. one whole orbit), possibly halved during the last hour.

Comment Whatever... (Score 2) 228

John Stuart Mill was taught ancient Greek by the age of three. By the age of eight, he had read Aesop's Fables, Xenophon's Anabasis, and the whole of Herodotus, and was acquainted with Lucian, Diogenes Laertius, Isocrates and six dialogues of Plato.

My kids are way behind!

I will admit two laments about modern education:

1) Too much homework for young kids (pre-K, K, etc.) Not that homework is a bad thing, but when a kid can't even read, "homework" is really "parent work".
2) Too many public school fundraisers. I thought this was all socialist schooling paid for at the point of a gun by taxes? If they expect me to pay for school, I'll send my kids to private school and move to some place that has lower taxes. I don't remember any of these crazy fundraisers when I was in school...

Comment Rock names (Score 1) 224

The worst naming was a company that used rocks for their product names.

Granite, Amethyst, Quartz, Topaz. These were video encoders, transport stream processors, video servers, etc., but I was never able to remember which was which.

Comment Should be NCSA Mosaic Day (Score 2) 70

Look, WWW is all nice and stuff, but frankly before NCSA Mosaic was released you could not really tell the difference between Gopher and WWW, and while they were interesting to play with, it was just play (unlike USENET News which had real value :). Somehow Viola never had much impact either.

NCSA Mosaic was originally released January 23, 1993. I gasped when I first saw it, because I had been dreaming of a global hypermedia network, and it showed that was possible. That day changed my life from someone who was an electrical engineer to someone who designed early commercial web sites.

Version 1.0 for Windows was released on November 11, 1993, and of course that is when "normal human beings" had any chance of getting on the Web.

Comment It is about integration (Score 2) 31

The advantage of silicon photonics is to integrate the optical elements (lasers & PIN diodes) into the silicion drivers and amplifiers, theoretically reducing cost.

There are already 100 Gbps CWDM4 QSFP28 (4 wavelengths of 25 Gbps on 2 fibers) and 100 Gbps PSM4 QSFP28 (single 25 Gbps wavelength on 8 parallel fibers) transceivers out there, but they need discrete lasers & PIN diodes in InP or GaAs, not silicon.

So we will see how Intel's silicon photonics 100 Gbps CWDM4 QSFP28 and 100 Gbps PSM4 QSFP28 transceivers end up being priced.

My impression is that 50 Gbps wavelengths are coming soon (using 4-level PAM), so two of those will be 100 Gbps. But the holy grail is the one wavelength 100 Gbps, likely some kind of high-order modulation (HOM). AppliedMicro has demonstrated a 100 Gbps single-wavelength PAM4, but no word on distance.

Comment Re:Meanwhile in other countries... (Score 1) 104

However in the rest of the OECD countries DSL outsells cable by a large margin with very few exceptions.

American Telcos have screwed up, that's not the technology's fault, it's the companies' fault for how they implemented it.

My theory is that in the US, earlier adoption of digital telephony switching allowed earlier consolidation of telephone central offices, thus longer local loops (which didn't matter for telephony).

In other countries, the consolidation of central offices was delayed for some reason, which kept local loops shorter, which is great for DSL.

It isn't a just a density issue either - Australia has lower average local loop lengths than the US as well.

Comment Re:Meanwhile in other countries... (Score 1) 104

Those talking about how cable is a superior technology to DSL don't know what they're talking about. What makes either technology superior or inferior is the implementation, both technologies are capable of good solid high speeds if implemented right.

There is an inherent problem with twisted pair. If your local DSL loop is over 2.5 km, you will never get over 5 Mbps. The average US local loop is 4+ km.

It is true that if your DSL loop is shorter, say 600m, VDSL2 can get you 100 Mbps, and if it is crazy short like 150m you can get 500 Mbps with But we are now talking about fiber-to-the-node like UVerse with a DSL last couple of feet.

The issue is that coax has less loss and greater bandwidth than twisted pair, and in general cable coax loops are shorter because there are already nodes in your neighborhood instead of a DSLAM at the central office.

Slashdot Top Deals

: is not an identifier