Nexcom NDiS 127 User Manual page 34

Chapter 3: System Setup
3. Note how the module is keyed to the socket. Grasping the module by
its edges, align the module with the socket so that the "notch" on the
module is aligned with the "key" on the socket. The key ensures the
module can be plugged into the socket in only one direction.
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4. Insert the module into the socket at an approximately 30 degrees angle.
Apply firm even pressure to each end of the module until it slips down
into the socket. The contact fingers on the edge of the module will
almost completely disappear inside the socket.
The ejector tabs at the ends of the socket will automatically snap into
the locked position to hold the module in place.
Key
Notch
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NDiS 127 User Manual