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Format - Floyd Davidson writes: shamino@techie.com (David C.) wrote:First off, there is no way an analog phone line will ever go to morethan 56K without all the phone companies replacing millions ofdollars worth of equipment. And that's not going to happen becausethe existing equipment is perfectly good for carrying voice calls -which is what the voice network is meant for. Welllll... many, if not most, are offering xDSL service of one kind or another. Hence it seems to be that indeed they *are* replacing millions of dollars worth of equipment!I should've been more specific here. I was talking about voicelines.I realize that the local loop of a DSL line is also analog, but it'sirrelevant to the discussion here. As for why, the phone network digitizes audio at a sampling rate of 8K bytes/sec, using 7-bit u-law encoding. This is 56K bits per second. Except, that isn't what they do. It is an 8KHz sampling rate, but it is an 8 bit u-law encoding. That is 64 Kbps for a DS0 rate.If a 64Kbps rate was being delivered all the way to your home, thenyou would be able to receive data at that rate.You must have something wrong here.I realize that a DS0 is 64K, but the D-A conversion doesn't use allthe bits. The 8th bits were historically used for signaling. Eventhough modern equipment doesn't do this anymore, they can't juststart using these bits, because not every telco around the world hasbeen upgraded. Any encoding that tries to pack more bits onto the analog wire will simply see data loss as soon as the analog signal hits the telco's central office - where it will be digitized at 56K for transmission through the network. Unless, of course, it is IP traffic that is routed via the Internet. In which case the rate depends on what kind of xDSL service was used on the local loop.Again, irrelevant. I'm talking about a voice line. As for why the FCC puts an artificial limit at 53K instead of The FCC does *not* put any artificial limit at 53Kbps. Anyone who wishes to encode the data so that it will pass 56Kbps is perfectly able to do so.Then why hasn't anyone done it yet? Absolutely every modemmanufacturer says that it's illegal for them to do so. If they'reall lying, maybe you can explain why nobody want's to be the firstout the door with true 56K capacity. The FCC couldn't care less about your modem speed. They care quite a bit about if your voice calls (and that's what any analog modem connection is) is going to interfere with your neighbor's voice calls. v.90 modems are not an "analog modem" in the downlink direction.Oh really? When did someone go and replace half of my voice line?I am aware that the ISP-end of a modem call is a digital connectionto the phone company. Same as if I make a voice call to someone witha voice phone on an ISDN line. But it doesn't mean that my call isany less analog on my end.Perhaps you should get out of "telco engineer buzzword" mode and tryto make your point without using language that does nothing butconfuse everybody who doesn't work for phone companies. It is simply wrong to say that the FCC could care less about your modem speed. The power specifications are what prevents somebody from interfering with *your modem call*! (Just imagine someone connecting their Hi Fi amp to the telephone line...)Now you're contradicting yourself in one sentence.First you say that the FCC does care about your data rates, and thenyou say that their specs have nothing to do with data rates (becausethey apply to lines at all kinds of different rates.)So which is it?You may know what you're talking about here, but from where I'msitting, I'm just seeing a whole mess of buzzwords with noexplanations that us mere mortals can understand. If you're tryingto explain something to this newsgroup, you aren't succeeding.-- David
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