Rane DH 1 User Manual
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DIGITAL HYBRID
The DH 1 Digital Hybrid allows audio conferencing
over a standard POTS 2-wire phone line. A 32 millisecond
Line Echo Canceller is utilized to remove line echo caused
by the four-wire to two-wire conversion. In a standard
telephone the echo caused by this conversion is actually
beneficial to the user as side-tone. With a conference system
line echo can cause all types of problems including feedback and echo canceller problems.
The DH 1 installs by first temporarily removing the top
cover of the ECM 64 and the rear phone jack cover on the
back of the ECM 64. See the diagram on page Manual-6.
Seat the DH 1 module from its bottom side onto the ECM
64 J10 header. Make certain that the header pins are
properly aligned with the DH 1 before applying force to seat
the card.
Warning: To protect against damage from electrostatic
discharge (ESD) proper ESD control measures must be
followed when installing the DH 1.
DH 1
DH 1 and ECA 1 Installation
ECA 1
11580
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