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This is a Question Based on Standards of UTP Cables & ADSL.

Category 1 (Cat1) standard cable in UTP cables are used for Audio Communication, esp used in Telephone lines and ISDN. The cable supports a speed of upto 1Mbps.

The Data is clear for me. I have a doubt about ADSL (Assynchronous Digital Subscriber Line).

In ADSL, Internet connection is established through Telephone-line. A Cat1 cable is connected from splitter to the ADSL modem (which have a bandwidth of about 1Mbps as said abv). But ADSL can provide a data rate of more than 2Mbps to the user who is using Internet(ADSL2+ has a speed of about 24Mbps).

How is it possible that more than 2Mbps data pass through at Cat1 cable to an ADSL modem?

How does this tech works?

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"The cable supports a speed of upto 1Mbps" - Incorrect, a cable intended for analog voice would not be spec'd for bit rate, but for frequency. i.e. bandwidth, which is about 1 MHz for Cat 1. ADSL, like other sophisticated digital transmission schemes/modulations, can transmit several bits per each symbol. – sawdust Jan 16 at 21:02

closed as off topic by Nifle, Mokubai, Zoredache, Dennis, 8088 Jan 17 at 3:49

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1 Answer

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In short, it can't. Just because CAT-1 is good enough for telephone doesn't mean it's good enough for ADSL.

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