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ISDN/ADSL digital, is it not ?or is it?

Guest tioung
Guest tioung
in Computer Science

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Hi,

 

I'm confused there!

 

ADSL and N-ISDN use extra frequency bands for more capacity, right?

BUT, they are still analogue like dial-up?

Am I right?

 

David

N-ISDN = Narrowband Integrated Services Digital Network

ADSL = Asymmetric Digital Subscriber Line

 

Both digital not analogue hence the better speeds as data does not have to be converted into an analogue signal at either end as with dial up.

dial-up uses a cut-off frequency band of 3000 Hz which canot transmit digital while adsl uses higher frequency bands which can.

Is that right?

dial-up uses a cut-off frequency band of 3000 Hz which canot transmit digital while adsl uses higher frequency bands which can.

Is that right?

 

 

Yeah sort off! 3000 hz won't fit much information! And u get much disturbance and effects in that area too! So higher frequencies are more suitable and can cary more info! If i'm not totally mistaken :rolleyes:

Thanks a lot, guys.

I appreciate that!

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