Acer Network Device Altos R520 - Manual (Page 91)

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4 Attach the module to the ARMC/3 module connector on the
mainboard and snap the standoff into the matching hole on the
mainboard (B).
5 Install the NIC module.
a Install the three standoffs to the mainboard.
b Attach the module to the NIC module connector on the
mainboard and matching standoff holes.
6 Observe the post-installation instructions described on page 40.