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28.8kbps is a standard speed for dialup modems, But even if your modem is rated at 56kbps, often 28.8kbps is all you'll get. There's one major factor that causes the actual speed to be lower than advertised.
How can I get my PC to run faster than 28.8kbps? I use to run at 40.0kbps but lately I've been stuck at 28.8. What should I do?
First let's be clear about something, it's not your computer that's slower than you expect, it's your modem.
And while your modem may be rated at up to 56kbps, it's rare to ever see that speed. And yes, speeds of 28.8 are not uncommon. But since you were getting 40, obviously something changed.
The Plain Old Telephone System (or POTS) was never designed to carry digital data - heck, it was designed before practical digital data even existed. Phone lines are designed to carry sound.
Your modem (short for modulator/demodulator) is the device that turns the digital 1's and 0's that your computer "speaks" into sound that can then be transmitted over phone lines.
As technology has improved, so have modems. 25 years ago we were stuck with speeds of 300bps (no 'k' ... we're talking 0.3kbps here). That's about 30 typewritten characters per second. Over time speeds increased ... 1200, 2400, 4800, onward up to the current common maximum of 56,000bps, or 56kbps.
As speeds increased, so did their reliance on the quality of the phone line. In fact, many of the higher speeds simply made assumptions about the quality of the connection, and if the quality wasn't there, the speed would drop.
56kbps is almost never actually seen. As I understand it, it requires a pristine phone connection with no noise and strong signal. The reality of the telephone system is that noise is simply a fact of life.
You've probably experienced it yourself when making a phone call. Sometimes the connection is crystal clear (though perhaps with just a little background noise that modems notice, but you might not). Sometimes it sounds like the person at the other end is speaking through a wet blanket, or that someone is popping popcorn while you're trying to talk.
Telephone line noise and/or low volume will cause your modem to slow down.
I used to experience this regularly. When traveling to my in-laws, I would use a dial-up connection from the farm house. Way out in rural farmland, the phone worked just fine for voice communication, but the signal was weak and noisy. I was lucky to get 28.8kbps, and frequently got much lower.
So as you can see, what I'm leading up to is to check out your phone line. If you used to get a reliable 40kbps, and now only get 28.8 without making any changes to your modem configuration, then there's likely more noise, or a lower signal, on your line.
It could be your issue - perhaps you added more phones to your home, perhaps a power cable got placed too near a phone line and noise is now crossing over, perhaps a buried cable got wet and static has been introduced. Perhaps the cable you're using to connect to the phone line has become frayed, or the connections have worn.
It could just as easily not be your fault. The phone company, or even your ISP, could have done something that decreased the signal strength or inadvertently added noise.
You can check with them, but depending on their level of customer service commitment, it may be difficult to get them help. My take is that most are more interested in selling additional services such as DSL that improving the quality of a phone line as long as that phone line works well for voice.
One last thought: it's possible that it could be your modem. While most modem failures are catastrophic (it just stops working), sometimes failures are more gradual. You might try taking your computer to a different location - a known good location - and seeing if you get your higher speed connection back.
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