ZyXEL Communications P-660HW-D User Manual page 264

Appendix B About ADSL
With cable modems, transmission speeds drop significantly as more users go on-line
because the line is shared.
3 ADSL can be "always on" (connected). This means that there is no time wasted dialing
up the service several times a day and waiting to be connected; ADSL is on standby,
ready for use whenever you need it.
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P-660HW-D User's Guide