NEC IPASOLINK 400 Installation And Provisioning page 23

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Figure 10 presents the plug-in unit configurations in the indoor unit and Figure 11 depicts the plug-in units.
Figure 10. Indoor unit NWA-055268-001 and its ODU connection
Figure 11. Universal Slot-modules/cards. Note: Modem-A module: the old HW-version has no ONLINE led.