Re: DSL Speed

Choreboy wrote:

>> Ah, crosstalk! It seems to me that if DSL uses the same wire dialup >> used, the same crosstalk will be present. > Not necessarily. Remember AM and FM radio waves go through the same > air, but AM is much more sensitive to lightning and other static than > is FM.

By your analogy comparing a noisy room to a quiet one, I thought you meant the wiring for DSL had no crosstalk.

DSL service may be arranged to minimize crosstalk.

So there's less crosstalk on wiring used for DSL?

> On dialup, it seemed to be the wire that wouldn't let me connect at >> the farm at the same speed I could connect a block from the CO. I >> wonder how the farm wire, that wouldn't take 50k on dialup, will carry >> 1.5M or more on DSL. > Because it's NOT just the wire to the farm, but ALSO other parts of > the telephone plant being set up for DSL.

At the farm, it seems to be the wire that limited my dialups to 46k when I got 52k in town. If the wire wouldn't carry more than 46k, it wouldn't matter what the telco did at their end. I wonder how a DSL signal can carry 1.5M through those mile of wire.

> I have trouble understanding on the phone, and I often resort to >> the phonetic alphabet to be understood. I think the problem may be >> more in the typical quality of phones than in bandwidth. You could >> have broadcast quality microphones and loudspeakers and it will >> still sound like a telephone because of the limited bandwidth. >> Since bandwidth is limited, telephone components aren't high >> fidelity as it would be a waste to make them so. (I believe the >> modern "K" handset is clearer than the older "G" handset.)

Military AM and SSB are limited to 300-3000 Hz. Shortwave radios can be filtered that way for tuning and difficult conditions. Speach comes across pretty clearly. If telephone voices are harder to understand, I think the problem must be something besides the nominal bandwidth of a telephone.

> Does a POTS line from the CO to a house carry multiple voices? > Depending on the location, often times yes. Between central offices > or within the CO almost always yes. I mean if you live across the > street from the CO you probably have dedicated copper pair, but you > live some distance you probably are multiplexed over a carrier line. > The degree of multiplex determines your bandwidth.

Would you be able to connect with V90 on a multiplexed line?

> For marketing, bundling can entice a customer who would not >> otherwise have bought them all. You lose the customer who wnats just >> one and doesn't have money to waste. That's why Henry Ford didn't >> bundle his cars with garages. > Remember that while Henry Ford did very well at first, eventually > General Motors and Chrysler surpassed him with their cars. They > couldn't be the Model T on price, but they had better marketing. What > was great in 1918 wasn't so great in 1928. Henry Ford was so stubborn > he almost ruined the company and his family had to take it away from > him. Even his wife voted her shares with the others and he was forced > out. It's a shame such a brilliant man was also such an mean SOB. > His "$5/day" wages was partly myth.

I think it was speed and price. Roads had improved by 1928, and other brands were faster than the Model T. I suppose the competition was also more affordable than it had been in 1908. Similarly, consumers who once settled for 14.4 modems now want faster speeds, depending on the price.

> I was speaking of Bellsouth's costs. I understood million-dollar >> switches were the big cost for voice service, while equipment to carry >> heavy internet traffic was the big cost for DSL. > In many cases, if not all, the equipment is the same. Today voice > talk is converted to digital for transmission, and those digital > signals share the lines with DSL signals. I'd say the biggest > investment (beyond more capacity) was in local loops so that customers > could have reasonable speed on DSL. Not everyone can get it.

Earlier in the thread I learned that the switches for voice calls are very expensive.

As far as capacity goes, I don't know how fast is the digital stream for a voice call, but I'm sure DSL at 2.5Mb/s requires much more of the telco's capacity.

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