Yealink SIP-T48G Administrator's Manual page 34

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
For SIP-T23P/T23G/T21(P) E2:
3) Connect the network and power:
AC power (Optional)

Power over Ethernet (PoE)

Note
PoE is not applicable to the SIP-T21 E2 IP phones.
AC Power (Optional)
To connect the AC power and network:
1. Connect the DC plug of the power adapter to the DC5V port on the IP phone and
connect the other end of the power adapter into an electrical power outlet.
2. Connect the included or a standard Ethernet cable between the Internet port on
the IP phone and the one on the wall or switch/hub device port.
Power over Ethernet
With the included or a regular Ethernet cable, IP phones can be powered from a
PoE-compliant switch or hub.
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