btoptical

8 ms·

1.
by btoptical 11y ago
These are great saws. The founder originally just wanted to sell his safety device to table saw manufacturers. He had no takers so he started his own company. My next door neighbor lost 4 of his fingers in a table saw accident. I believe
2.
by btoptical 11y ago
Really none of that is correct. Firstly it's not at all equivalent to an AM radio. It is an AM modulated carrier but that's about it. The detection scheme direct detection and not coherent like in an AM radio. Also your power sp
3.
I Ate Soylent for a Day(lightreading.com)
5 points by btoptical 11y ago|1 comments
4.
by btoptical 11y ago
While impressive it's not clear why such a low phase noise oscillator is needed. This oscillator looks like it takes up lots of space and power. So some justification for the device should be presented. Furthermore its possible to c
5.
by btoptical 11y ago
Let's figure out just how much area we need for solar panels. The US consumes about 19.05M barrels of oil per day. Each barrel of oil is about 1.6 MWh of power. So this is 31017210 MWh (3.1 x 10^10 kWh) of power just in oil every day.
6.
by btoptical 11y ago
Yes, a conventional 2-port MMI will generally give you a pi/2 phase shift of one port relative to another. If you combine the 2 ports again with another MMI, you have built a Mach-Zehnder interferometer with ideally pi phase differenc
7.
by btoptical 11y ago
She also spun out the original HP business of test and measurement equipment, chips, transceivers, etc as Agilent (now Keysight). I never ever thought of HP as a computer company. To me HP was oscilloscopes, spectrum analyzers, network an
8.
by btoptical 11y ago
Kind of the stuff of science fiction but...I can imagine that if we could put someone in a medical induced coma for a long-period of time, sort of like suspended animation, we could perhaps find ways to treat the cancer while the brain is i
9.
by btoptical 11y ago
A better non-paywall source is here: http://www.lightreading.com/business-employment/how-do-nokia... ? Includes discussion of how such a merger would affect Juniper. Juniper is ALU's IP routing partner.
10.
by btoptical 12y ago
I've been to lots of them all over the world, names you'd recognize, and they've all had 48V.
11.
by btoptical 12y ago
These big switch boxes typically end up being about thermal management and this box looks like thermal design was an afterthought. Also I'm not sure the power entry design is really all that smart. Generally speaking if you're i
12.
Bell Labs president criticizes networks based on drones and balloons(lightreading.com)
1 points by btoptical 12y ago|0 comments
13.
by btoptical 12y ago
The Whole Foods in Almaden (affluent South San Jose) hires off-duty San Jose PD to provide security. The officers are in full uniform and carry their utility belt and service weapon.
14.
by btoptical 12y ago
Error Correction Coding is hardly mundane and in modern communication systems far from trivial. There is a lot more to ECC than Reed-Solomon. Basically nothing in our digital world today would work very long without it. You think of it a
15.
by btoptical 12y ago
You may also like this: http://youtu.be/CIZNh1G2vNI This guy built a fully functional scale model of a Ferrari 310 including the V12 engine all from photos. He built every part. He tuned the car so that it makes the sound
16.
by btoptical 12y ago
Yep at Univ. of Rochester as physics undergrads we were often allowed a single sheet of paper with anything on it (we were told no microfiche!). I did a few open book exams but still made the "cheat" sheet. We all spent a great
17.
by btoptical 12y ago
It's easier to lay a subsea cable than to go overland in remote areas. Take a look at the subsea map of Africa as an example. In Africa the subsea links are there because it's too remote to run cables through the jungle or across
18.
by btoptical 12y ago
In some cases the cable is buried on the sea floor by a special plow. It's incredible that the cable can be buried up to 6m deep in the mud on the bottom. Cable burial is intended to keep fishing equipment from snagging cables laid o
19.
by btoptical 12y ago
Yes. It's a 100G service though. Infinera runs on 25G spacing so at 25G dual wave dual polarization is 100G in the same spectral efficiency as single wave.
20.
by btoptical 12y ago
See for example: http://newswire.telecomramblings.com/2013/01/telstra-global-... So you have to separate the "wet" plant from the terminal gear. The speed of the terminal gear is completely disconnected
21.
by btoptical 12y ago
Nope this will be 100G per wave not 40G. 40G was a stop-gap technology that never really shipped in large volume. With the advent of coherent optical, everyone just went to 100G (eg. Infinera, Ciena, Alcatel-Lucent) EDIT: One caveat, dep
22.
by btoptical 12y ago
Nope, the new fiber will be high dispersion compared to the old fiber and also will not have dispersion compensation along its length. The old cable was designed for OOK signaling. Previously optical signaling was 1 bit per symbol OOK (on
23.
by btoptical 12y ago
A fiber is point-to-point unless there's an add/drop along the way. A submarine cable is point-to-point between say California and Japan or New York and Southampton. That 5GHz radio has short reach and low capacity. It'd onl
24.
by btoptical 12y ago
If you'd like a different perspective regarding the quality of your broadband connection and the reasons for congestion this is a good read that basically says ATT at least does not provide enough connectivity from the Level 3's o
25.
by btoptical 12y ago
Actually Google found that GPA is a weak indication of how a person performs. Apparently, according to Google, the GPA is only weakly correlated with job success in the first year or two. http://www.businessinsider.com/how-g
26.
by btoptical 12y ago
When I was a physics undergrad all 12 physics majors in my graduating class were given a "talk" by a senior white faculty member about the "realities" of the physics pyramid. Basically we were told that our Chinese compe
27.
by btoptical 13y ago
I think this process is really baking out moisture as the PCBA is not in the oven long enough to get to temperature and the temperature is not hot enough to reflow the solder. Most of the components on the board are not hermetically package
28.
by btoptical 13y ago
There are serious errors in this article. SDL (Spectra Diode Labs) was a Silicon Valley company and not based out of Zurich. They had offices and a semiconductor fab on 1st st in san jose. No idea where the author got Zurich from. Anyway
29.
by btoptical 13y ago
$100k is low for a HW designer unless you have no experience building anything (home/school projects don't count). $135k-140k is about right for an experienced Staff-Level HW designer. In my view not getting paid market rate and