What is the PoE power pins assignment mode A & B?
What are Pins?
Pin: An electrical connector. When you examine the ends of your Ethernet cable, you’ll notice eight metal stripes – these are the pins. They play a crucial role in transmitting data.
Pinout: This refers to which pins should connect for proper functionality. There are two primary pinouts: Mode A and Mode B. These determine the arrangement of wires within the cable.
PoE Power Pin Assignment
There are two modes of PoE: Mode A delivers power on the data pairs of 100BASE-TX or 10BASE-T, and Mode B delivers power on the spare pairs. PoE can be used on 1000BASE-T Ethernet, in which case there are no spare pairs, and all power is delivered using the phantom technique.
What is PoE Mode A?
In Mode A, pins 1 and 2 constitute one side of the 48 VDC, and pins 3 and 6 form the other side. These same 2 pairs are employed for data transmission in 10BASE-T and 100BASE-TX, allowing the simultaneous delivery of both power and data over only two pairs. The inherent polarity allows PoE to accommodate crossover and patch cables and auto-MDIX.What is PoE Mode B?
In mode B, pins 4–5 form one side of the DC supply and pins 7–8 provide the return; these are the "spare" pairs in 10BASE-T and 100BASE-TX. Mode B, therefore, requires a 4-pair cable.
The PSE (power sourcing equipment), not the PD (powered device), decides whether power mode A or B shall be used. PDs that implement only Mode A or Mode B are disallowed by the standard.
Mode B or Mode A?
EtherWAN switches produce a 48-volt PoE device that strictly adheres to either Mode A or B. Please check the list of EtherWAN products below.
Can you mix PoE with non-PoE?
Yes. Power over Ethernet does not disturb normal switch transmission of data. Both PoE and non-PoE devices can connect to the same PoE switch.Read More: Break the PoE 100 meter limit, with no extenders or repeaters
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Updated in Mar. 2024
| Mode A | Mode B | |
| EX78000G Series | V | V |
| OttoE PoE Series | V | V |
| EX78000 Series | V | V |
| EX78602 Series | V Port 5, 6 | V Port 1~6 |
| EX78900 Series | V | V |
| EX45900 Series | V | |
| EX42300 Series | V | |
| EX46900A Series | V |
