Panasonic BL-PA300KTA Operating Instructions Manual page 22

Useful Information
7.
When the PLC indicator of each adaptor lights in green, registration
was successful.
• If the PLC indicators do not light in green, see page 23.
8.
Wait about 30 seconds, then unplug the adaptors and place them
where you plan to use them (see page 15).
Note
• While registering an additional terminal, communication between all
other adaptors may be disrupted for about 10 seconds.
22