I killed my brain last night, I'm having a brain fart, help

[StrangeRanger]

I'm totally losing it today...I can not remember how to convert transfer speeds. Like 128K/? = etc. you know? Like a 56K modem is running at yadayada. help here, i'm brain dead.
j

 

[AndyHui]

Erm...divide by 8?

A maximum download speed for a 56K modem is about 7KB?

 

[StrangeRanger]

that's what I thot. but i'm movin' reallllllll slow today. thanks
j

 

[oldfart]

Its more like divide by 10 or so for an analog modem. Its asysnc, there is error correction, compression, etc to factor in. 56K is ~ 5.6K/sec download speed.

 

[AndyHui]

True.

But on my crap Motorola SM56 PCI, I can get consistent downloads up around 6.xx KB/s on a connection at 52,000Kbps. As usual, YMMV, but I do agree with the general rule from oldfart.

 

[Cuular]

You may get EFFECTIVE download rates above 5.6k, but you can NEVER, and I repeat NEVER get faster than 5.3K bytes download speed. That is the maximum download speed the FCC allows. Using compression and such, you can get a speed that is effectively higher, but you just can't break the laws of transmitting bits. You have the start bit, the 8 bits for the byte of data, the stop bit, and errorr correction. So by dividing your K bits by 10 you get an idea of the ACTUAL download speed in bytes.

 

[Sniper82]

heres a easy way to do it:

56k=around 5.6k a sec download speeds
128k=around 12.8k a sec download speeds
256k=around 25.6k a sec download speeds
512k=around 51.2 a sec download speeds
1024k=around 102.4k a sec download speeds

Its that simple.

 

[Rayden]

Is this why my DSL connection, which usually runs at 1100kbps, has at a maximum, downloaded files at around 100kbps?

 

[Agent004]

It's a good aproximation, considering broadband has a greater overheads than narrowband. Tweaking reduces that overhead and therefore allowing higher download speeds close to the theortical bandwidth.

 

[Sniper82]

Yeah if you get speeds of 1100kbps your not gonna d/l at that speed your only gonna get 100k/125k a sec. I got Charter which is suppost to be 2024kbps and I d/l at around 200k(sometimes 250k). D/l this speed test utility.

Speedgadget

 

[ssanches]

<< True.

But on my crap Motorola SM56 PCI, I can get consistent downloads up around 6.xx KB/s on a connection at 52,000Kbps. As usual, YMMV, but I do agree with the general rule from oldfart. >>



Hey Andy,

I too have the same modem on the motorola SM56 chipset. Unfortunately these folks don't have a WinXP driver released as yet, so I'm using the Win2000 driver on it. The performance isn't that good though (as under Win98SE). What driver are you using? Any luck on getting a driver specially written for WinXP? AFAIK, the SPD division of motorola has already closed down, so I'm stuck with this craptastic modem :disgust:

 

[AndyHui]

I'm using the older 80.xx drivers. These perform better and are more reliable than the latest 84.41 drivers, but the modem won't come back on-line after a Hibernation.