Rane ECM 64 - Manual (Page 13)

Manual-13
DH 1 and ECA 1 Installation
ECA 1
DH 1
ECM 64 Options
Two internal cards are available for the ECM 64. The
ECM 64AD already includes both options.
ECA 1 Acoustic Echo Canceller
The ECA 1 is a continually adaptive Acoustic Echo
Canceller (AEC) module, required when the ECM 64 is used
for audio teleconferencing.
The ECA 1 installs by temporarily removing the top cover
of the ECM 64 and seating the module onto factory installed
standoffs on the motherboard. The connectors on the ECA 1
and the motherboard are keyed, so there is only one direction
that the ECA 1 can be installed (see below). Warning: To
protect against damage from electrostatic discharge (ESD)
proper control measures must be followed.
See page Manual-10 for Acoustic Echo Canceller opera-
tion.
DH 1 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. Warn-
ing: To protect against damage from electrostatic discharge
(ESD) proper ESD control measures must be followed when
installing the DH 1.