Yealink SIP-T42S Quick Start Manual page 3

3. Connect the network and power, as shown below:
You have two options for network and power connections. Your system administrator will advise you which one
to use.
Note:
The IP phone should be used with Yealink original power adapter (5V/1.2A) only. The use of the
third-party power adapter may cause the damage to the phone. If you are connecting a PC to your phone,
we recommend that you use the Ethernet cable provided by Yealink.
If inline power (PoE) is provided, you don't need to connect the power adapter. Make sure the hub/switch
is PoE-compliant.
Startup
After the IP phone is connected to network and supplied with
power, it automatically begins the initialization process. After
startup, the phone is ready for use.
2
PC Connection
(Optional)
PC
A
AC Power Option
B
PoE ( Power over
Ethernet ) Option
PC
PC Connection
(Optional)
Initializing...please wait
Power Adapter
(DC 5V)
IEEE 802.3af compliant
PoE Hub/Switch
Welcome