Panasonic KX-HGT100CE Quick Reference Manual page 10

Connection
Connection
<Back view>
Attach the ferrite core to the AC adaptor cord.
10
7 cm
AC adaptor (not included)
To a Switching Hub.
To a PC.
Headset (not included)
Recommended:
KX-TCA87, KX-TCA89
Do not use a KX-T7090 headset.
AC adaptor LAN PC