physical line; physical circuit
In networking, refers to the actual hardware connection (cable, fiber, etc.) as opposed to a logical or virtual circuit.
This network uses optical fiber as the physical line.
The logical connection is established, but a fault occurred on the physical circuit.
Refers to a logical or virtual circuit, as opposed to the actual hardware connection.
Compound of 物理的 (physical) + 回線 (line, circuit). A straightforward technical term.