ZyXEL Communications 802.11g ADSL 2+ 4-Port Security Gateway HW-D Series - Manual (Page 370)

P-662H/HW-D Series User’s Guide
370 Appendix B About ADSL
2 Because your line is dedicated (not shared), transmission speeds between you and the
device to which you connect at your service provider are not affected by other users. 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.