Serial Physical Connections
PHY Layer Connections
PHY Layer Connections
SMA Connector / SMA Cable

SMA: The 'Sub-Miniature A' connector is a 50 ohm threaded connector.
SMA Connectors will operate up to 15GHz, with some going up to 26GHz.
Definition of Coaxial Cable, Definition of SMA Connector
Manufacturers of Coax Connectors
--------------------------------