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A simplification.
While Cat5 cable or similar (4 sets of twisted pair) can be used for phone, Analogue video (Composite, S-Video, Component or VGA using baluns), ISDN, HDMI (two cables, no baluns needed), Digital Audio and USB, "Ethernet" is only used for networking and can use very many different physical mediums. Cabling need not carry TCP/IP, NetBeui and Netware used the same cables and Ethernet cards.
I've used coax with vampire taps, Cheapernet (ordinary coax with T pieces), Cat5 on 10Mbps, 100Mbps and 1000Mbs as well as Cat5e and Cat6. Both UTP and STP.
I've also used Token Ring. As well as networks using RS422 & RS485. TCP/IP doesn't need Ethernet. It can use WiFi or USB ports.
Note an ISDN patch cord looks like an Ethernet patch cord but they are not wired the same.
There are different physical and protocol layers on each system.
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