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).
Maximum achievable data rate is 40 Mbps
over a few meters of cable length.
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