AASTRA 51i Installation Guide

10 Model 51i IP Phone Installation Guide

Inline Power Not Provided

If your network does not provide 802.3af compliant in-line power, you have to 

install the power adapter or the PoE inline power supply (optional accessory). 
1. On the top of your phone, connect the Ethernet cable (provided with 

your phone) into the network port marked with 

. 

2. On the PoE power injector, plug the other end of the Ethernet cable into 

the network jack marked as indicated in the following illustration.

3. On the PoE power injector, connect an additional Ethernet cable into the 

network port as indicated in the following illustration.

4. Plug the other end of the Ethernet cable into the network jack on the 

wall.

5. Plug the PoE power injector into a power outlet. 

Note: You should connect the power supply to a surge protector or power bar. All 

Ethernet cables used must be minimum category 5/5e straight-through 
cables, such as the cable provided with your phone.

PoE

 Power injector

(if Inline power or the

power adapter are

not provided)

Power Outlet

To Network

Jack

To Phone

Ethernet
  Cables

 

Network Jack

To PoE