Yealink SIP-T2 SERIES Administrator's Manual page 52

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
AC Power (Optional)
To connect the AC power and network:
1) Connect the DC plug of the power adapter to the DC5V (for
SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2/T19(P) E2/CP860) or
DC12V (for SIP VP-T49G) 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.
For SIP VP-T49G:
For SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2/T19(P) E2:
Note
You can also connect the SIP VP-T49G or SIP-T48G IP phone to a wireless network
according to your office environment. For more information,
phone-specific user guide
30
.
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refer to