In a local area network (LAN) or a metropolitan area network (MAN) using open systems interconnection (OSI) architecture, the physical signaling sublayer is the portion of the physical layer that:
- interfaces with the data link layer's media access control (MAC) sublayer,
- performs character encoding, transmission, reception and decoding and,
- performs galvanic isolation.
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“The preservation of health is a duty. Few seem conscious that there is such a thing as physical morality.”
—Herbert Spencer (1820–1903)