Will standard coaxial cable support High Definition tv signals?
Co-ax cable is quite capable of carrying HD signals as part of a
domestic cable service. However, optical fiber is now far more cost
effective than copper so it si increasingly used for trunks with
copper links carrying signals the last few feet into a home. Some
are now taking fiber right into the home.
Regarding video signals within the home, co-ax cable is used to
carry composite video (standard definition color signals) and this
will not carry HD signals. This is purely because coaxial
interfaces for HD in domestic equipment. Coaxial cable is still
used widely in broadcast environments to carry SD and HD