NEC Xen Topaz System Hardware Manual page 39

Xen Topaz System Hardware Manual
Spacers are provided with 308E/008E)
4. Mount the 308E/008E PCB to the "CN3" Connector.
5. In case a second PCB is installed, repeat Step-3 and 4. (Refer to
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Trunk/Extension Cabling and Installing the Expansion PCBs