Yealink SIP-T21 - Manual (Page 22)

User Guide for the SIP-T21P/SIP-T21 IP Phone
12
AC Power
To connect the AC power:
1. Connect the DC plug on the power adapter to the DC5V port on the 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
phone and the one on the wall or switch/hub device port.
Power over Ethernet
With the included or a regular Ethernet cable, the SIP-T21P IP phone can be powered
from a PoE-compliant switch or hub.
PoE is not applicable to the SIP-T21 IP phone.
To connect the PoE for the SIP-T21P IP phone :
1. Connect the Ethernet cable between the Internet port on the phone and an
available port on the in-line power switch/hub.
Note If in-line power switch/hub is provided, you don’t need to connect the phone to the power
adapter. Make sure the switch/hub is PoE-compliant.
The phone can also share the network with another network device such as a PC
(personal computer). It is an optional connection.
Important! Do not unplug or remove power to the phone while it is updating firmware
and configurations.