Re: USB modem not getting 56K

Ed Cregger wrote:

"David Maynard" <nospam@xxxxxxxxxxx> wrote in message news:11o7mne839ueac4@xxxxxxxxxxxxxxxxxxxxx

RogBaker@xxxxxxxxx wrote:


No, phone line is good. I got speeds of 48 or 49 everytime for years,
even right before I put in the new motherboard.

What the actual throughput was would me more helpful as 56k modems often report 'connect' speeds that are gross exaggerations of actual speed and I've seen 56k modems report '53k' even though achieving only 2kBps throughput. I.E. It seems they report whatever squawk they can detect and then fall back to something that actually works.


For some reason 33kbs
seems like its only half or a third of the speed.


33.6kpbs is the max for a normal phone line.


I may have even still
have the filter on the line from when I temporarily tried DSL.

A DSL filter does not 'help' an analog modem. It simply filters the high frequency DSL signals to the DSL line.

I can't say, for sure, whether a DSL filter might *hurt* a 56k connection on the phone side because my phone line has never been capable of 56k connect speeds but it's theoretically possible.


I
cancelled that because it was way more expensive then they advertise.
For the low $29 price, you had to sign up for a deluxe phone package.
Because your phone rate is now $29 + ($20 or $30) for phone services,
my taxes went up by around $15 or more I think. I was used to paying
$15 for dialup and $25 for phone, with DSL, my first bill was $180
(however there was a $50 rebate if you saw it on the fineprint on their
website). Talk about sticker shock.


56k modems can only get over 33.6k if they happen to be on a phone line that goes direct, and a short distance, to the terminal junction that makes the analog to fiber hop but there is no requirement for any phone line to be wired that way. It's simply 'luck of the draw' to have one.

It may be that, for some reason, your phone line has changed. That could be because the phone company needed to expand the number of phone lines in the area and, so, added an expansion terminal (so that you're no longer wired direct to the analog to fiber hop terminal) or it could be that your phone line needed to be routed to a different terminal that supported DSL when you tried DSL. Or, it could be something else on the phone lines in your house interfering with the modem.

Could also be due to plugging into a different phone jack, computer location, air born interference (cordless phone), wiring difference (like when it was modified to split DSL from the analog lines), etc.

At any rate, whether it's a matter of the modem now reporting more realistic speeds, something else in the house interfering with the phone line, or the phone line characteristics changing it's the phone line that determines the connect speeds.




I do remember reading that the FCC restricts the maximum phone line speed to 53K back to you. Your speed to them is always considerably slower. This is law, IIRC.

Not really, at least as it's implied. There is no 'speed' restriction and the restriction that does exist, namely that power level not exceed -12dB (over 3 seconds, I think it is), has nothing to do with 'limiting 56K modems'. It's simply what the standard telephone line specifications are and the "FCC restriction" argument is basically an 'excuse' to explain why 56k modems don't get 56k on standard phone lines.

Put simply, the 56k speed is based on mythical phone line parameters that don't generally exist in real life.


Ed Cregger 



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