Aastra 9143i Series Administrator's Manual page 25

A Power over Ethernet (PoE) inline power injector supplies 48V power to the IP
phone through the Ethernet cable on pins 4 & 5 and 7 & 8.
Reference
For more information about installing the PoE and additional Ethernet cable, see
your phone-specific Installation Guide.
Optional Accessories (for 6731i and 6751i IP Phones)
The following are optional accessories for the 6731i and 6751i IP Phones.
Optional Accessories (for 6753i, 6755i, 6757i, and 6757i CT IP
Phones)
The following are optional accessories for the 6753i, 6755i, 6757i, and 6757i CT
IP Phones.
M670i Expansion Module
for 6753i, 6755i, 6757i, and 6757i CT
41-001160-04 Rev 02, Release 2.5
Warning: Do not use this inline PoE power injector to power other
devices. See your phone-specific Installation Guide for more information.
Power Adapter
M675i Expansion Module
for 6755i, 6757i, and 6757i CT
Overview
IP Phone Models
1-5