Alcatel-Lucent Enterprise 8088, Руководство пользователя

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Connections:
To reduce cost, we want to avoid a board to board connector.
The daughter board will use the technique of the cut metal holes on the board edge (top view):
Before milling During milling Resulting connections
The connections number is 33, spread over three sides of the board as following:
M ounting on boards
The daughter board is mounted flat directly on the other boards.
This means that:

There is no component on the bottom side of the BTWDB
o
Also signal vias shall be prohibited to avoid risks of short-circuit with main board
GND.

There is no component on top of the mainboard
PCB
Metal holes
Gold plating