Panasonic KX-TDA30 Manual page 29

Note
If you need to open the ferrite core, use a flathead screwdriver to unlatch the case.
3.
Connect the cable to the RJ45 connector of the card.
4.
Connect the other end of the cable to the switching hub.
Connecting to a switching hub
IP-EXT4 in the KX-TDA30
Router
RJ45
Ethernet Straight Cable
PC
3.3.1 Connecting the IP-EXT Card
Switching Hub
Switching Hub
PC
IP-PT
with 2 ports
with a primary port only
Information about IP Proprietary Telephones
IP-PT
29