88.SOLUTION : The Modem light blinks as there is some data transfer that is taking place on your machine. If the page your are browsing contains ads that change dynamically, data transfer takes place when thes ads load.

This could also be due to an instant messenger theat is running, a download in progress, or even some back door or a virus. You can use the command, netstat in DOS to check what port is being used in your machine.

Secondly, you have the data transfer reate wrong as you are mistaken between the bauds, bits and bytes of the modem. Your modem speed could either be said to be 28.8 Kilo bauds per second or 28.8 kilo bits per second.

A baud is number of signalling elements that occur each second. This is approximately equal to the number of bits per second. Now, 1 kilobit in communication term would be 1024 bits(2^10), while a byte equals to 8 bits.
Your data transfer speed reaches speeds of 11500 bits per second, that is 11.5 Kbps to 2 Kilobytes per second, which translate as 16Kbps. Hence, the data transfer that is taking place is not from a minimum of 2 Kbps to 11.5 Kbps, but from a minimum of around 11Kbps to a maximum of 16 Kbps.