The approach an ADSL modem takes is very simple in principle. The phone line's bandwidth between 24,000 hertz and 1,100,000 hertz is divided into 4,000-hertz bands, and a virtual modem is assigned to each band. Each of these 249 virtual modems tests its band and does the best it can with the slice of bandwidth it is allocated. The aggregate of the 249 virtual modems is the total speed of the pipe.
How does this equate with this puzzle? I have a mildy disabled daughte - She's OK lives alone and copes pretty well but certain things need helping out on. I was looking at her phone bill and noticed her BT package was different and no Internet phone calls logged. So I sked whats this then? She said a BT man offered her special deal and it looked good so she said OK. She then said 'I also got this' rummaging under her desk. 'But I could not get it do do anything so I unplugged it'and where upon dragged out a BT/Yahoo broad band box with all the bits. I have yet to take a deeper look but it seems to infer she is on a BB link but using plain vanilla 56k modem - a puzzle or what?
*I have yet to take a deeper look but it seems to infer she is on a BB link but using plain vanilla 56k modem - a puzzle or what?*
A BB link is only a phone line - so a dial-up modem will work on it as normal. To work well you would normally need to use a micro-filter, but I have seen them working without when the BB modem is disconnected.
The dialup modem will obviously only work on the analogue part of the line - it won't connect to the broadband service. In fact, I'm surprised it works at all if it's connected without a microfilter - there's normally far too much line noise.
You'll be able to tell if your daughter signed up for a broadband service, because she'll have a direct debit set up on her bank account. It's most odd if no call charges are accruing in her phone bill though - I should investigate that before your daughter gets a nasty surprise in the post one day.
D-Link, 3-Com, and various other manufacturers refer to their ISDN adapters as 'modems' - as do many people in the IT industry. It's just far simpler to do so, and everyone knows what's meant.It's a generic term, as wee eddie said - let's not get trapped in the semantics, for goodness sake.