DHEI - Digital Headend Expansion Interface
The Digital Headend Expansion Interface is a synchronous serial ECL interface, formerly proposed by General Instrument (now Motorola), then adopted by Society of Cable Telecommunications Engineers (SCTE). DHEI comes in two versions : DHEI's simplex version is a unidirectional point to point link between broadcast equipments (DB-9 connector). Less popular, the duplex version handles a bi-directional synchronous link (DB-15 connector).
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