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Comment Re:Bandwidth? (Score 3, Interesting) 128

To compute the channel capacity, you need to know the channel's signal-to-noise ratio as well as its bandwidth.

The Shannon channel capacity formula is: C = B * log_2(1 + SNR) where C is the channel's capacity in bits/second, B is its bandwidth in hertz, log_2 is the base-2 logarithm and SNR is the channel's signal-to-noise ratio.

If we assume an SNR of 48 dB for a reasonable POTS line, its capacity would be C = 3 kHz * log_2(1 + 48 dB) ~= 3000 * log_2(63097) which is almost 48,000 bits per second.

This is a theoretical limit that realizable systems can only approach, but never equal or exceed. A practical system would also use extra bits for forward error correction purposes; I doubt that this codec deals gracefully with bit errors.

For back-of-the-envelope purposes, assume you could use this codec to send a single voice signal in 700 Hz of bandwidth on a channel with low SNR, or you could send 60 voice signals over a regular POTS line.

Comment Roy Moore (Score 1) 184

Roy Moore got away with it for quite a while, and in an extremely egregious manner.

If it takes that much effort to get rid of a judge who is willing to completely ignore his oath to the constitution, I don't think anything will happen to an appellate judge who is merely trying to get higher courts to reconsider a previous decision. Like any other profession, judges protect their own.

Expect to see more shenanigans like this as the new administration emboldens fringe elements.

Comment Why should this be surprising? (Score 4, Informative) 158

Many of these tech companies are located in areas that have a very high cost of living, so it's unfair to compare their intern salaries with average workers in the rest of the country. Also, many of these interns are either in high-demand programs at prestigious universities or already have degrees from them, and are doing actual productive work. They are not spending their time fetching coffee or shadowing real employees.

In my experience, technical internship programs are a good deal for both the company and the intern. They provide competent labor at a good price for the company and give students excellent opportunities for learning and growth.

Comment And it's a terabyte SSD as well (Score 5, Interesting) 42

The length of the cable is 12,800 km.
The speed of light is 300,000 km/sec.
The velocity factor of fiber is about 68%.
The data rate of the cable is 120e12 bits/sec.

The amount of time that the data stays in the cable is 12,800 km / (300,000 km/sec * 0.68) = 62.7 milliseconds. Multiplying that by the data rate of 120e12 bits per second yields about eight terabits or one terabyte. That is the amount of data "stored" in the cable, at any instant, during transit.

It's not much of an addition to the Google/Facebook data cosmoplex, but it is solid state, liquid cooled, highly distributed and largely immune from fires and small meteor strikes.

Submission + - SPAM: Leaked Videos Expose Inner Workings of Secretive Mormon Hierarchy

An anonymous reader writes: The Church of Jesus Christ of Latter-day Saints (Mormons) is notoriously secretive about the inner workings of its ruling hierarchy, the First Presidency and Quorum of Twelve Apostles. With an estimated annual income in the billions and assets in the tens of billions, the church does not release financial statements to its members or the general public. The meetings and decision-making processes of the Mormon leaders are similarly undisclosed.

That changed Sunday when a group called Mormon Leaks posted more than a dozen videos to YouTube, containing briefing sessions with the hierarchy. The briefings were apparently recorded "live" and include candid comments and discussion from the apostles in attendance. The leak appeared to be timed to coincide with the church's semi-annual conference that took place over the weekend.

Ironically, one of the briefings discusses WikiLeaks and the possibility of a similar leak targeting the church, but the apostles shown in the video appear to more concerned about Chelsea (nee Bradley) Manning's sexuality than they are about threats to their own secrets.

One briefing that is particularly troubling was given by a former U.S. senator from Oregon, Gordon H. Smith. Smith, a member of the church, admits that he values obedience to the hierarchy and loyalty to the church more than he does his office. He also describes using his office and staff to gain political favors for the church, and justifies the Iraq War by claiming that it will allow Mormon missionaries access to Middle Eastern nations. At one point (around the 26 minute mark), Smith possibly reveals classified information to the group, or at least his willingness to do so.

The videos appear to come from the same whistle blower who leaked a trove of church documents on-line about a week ago. Those documents are here and the leaker has announced that many more are coming.

Link to Original Source

Comment Does this pass the smell test? (Score 3, Insightful) 147

Unmanned ships could save money, weight, and space...

Seriously? The crew and crew quarters take up a significant fraction of the operating budget, weight and volume of a modern cargo ship? I'm not buying it.

Take a look at some of these ships: https://en.wikipedia.org/wiki/Container_ship

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