Power over Ethernet (PoE) Mode A vs. Mode B
11/22/2019
Power sourcing equipment (PSE) may supply power to a powered device (PD) in one of two possible modes. (Note 1) The operating mode determines which two wire pairs carry the DC PoE current.
- Mode A:
- Pins 1 & 2 = DC+
Pins 3 & 6 = DC- - Mode B:
- Pins 4 & 5 = DC+
Pins 7 & 8 = DC-
The implementation is fundamentally the same for 10/100Base-T and 1000Base-T systems. However, for 1000Base-T systems, there are always two wire pairs which carry both data and power simultaneously. For 10/100Base-T systems, it is possible to run power and data on separate wire pairs (Mode B).
Mode A is available upon special request only. 
Mode B is standard for GlobTek’s 18W and 36W PoE products. 
Note 1: PoE injectors >60W (for ex. GlobTek’s 70W GT-96600-7056) deliver power on all four pairs simultaneously, in a mode commonly called “4PPoE”.
GlobTek offers a wide variety of Power over Ethernet injectors utilizing patented technology which meets DOE EPS 2.0 Level VI compliant, a federal law in the United States, Canada, Europe, and other regions.
| Name | type | input_voltage | Output Watts | Vout | efficiency | technology |
|---|---|---|---|---|---|---|
GT-91080 Power Over Ethernet Powered Device Converter (IEEE802.3af PoE PD) Power Supply AC Adaptor | Desktop/External | 36-60 VDC | 12 | 5-24 V | Power Over Ethernet Powered Device Converter (IEEE802.3af PoE PD) Power Supply AC Adaptor | |
GT-91087 Power Over Ethernet Powered Device Converter (IEEE802.3af PoE PD) Power Supply AC Adaptor | PCB Mounted/DIP | 36-60 VDC | 15.4 | 5-24 V | Power Over Ethernet Powered Device Converter (IEEE802.3af PoE PD) Power Supply AC Adaptor | |
GT-96180-WWVV-T3-PP Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) | Desktop/External | 100-240V~, 50-60 Hz | 18 | 18-56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) |
GT-96180-18VV-T2-PP Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) | Desktop/External | 100-240V~, 50-60 Hz | 18 | 18-48 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) |
GT-96180-1856-T3-AP Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) | Desktop/External | 100-240V~, 50-60 Hz | 18 | 54-56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) |
GT-96180-1856-T2-AP Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) | Wall Plug-in+Desktop Combination | 100-240V~, 50-60 Hz | 18 | 56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Single Port Power Over Ethernet Midspan (IEEE802.3af PoE PSE) |
GTM96300-3656-T3-AP Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor | Desktop/External | 100-240V~, 50-60 Hz | 36 | 56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor |
GT-96300-36VV-T3-PP Single Port Passive Power Over Ethernet Midspan (Passive/Dumb PoE PSE) Power Supply AC Adaptor | Desktop/External | 100-240V~, 50-60 Hz | 36 | 18-56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Single Port Passive Power Over Ethernet Midspan (Passive/Dumb PoE PSE) Power Supply AC Adaptor |
GT-96300-3656-T3-AP Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor | Desktop/External | 100-240V~, 50-60 Hz | 36 | 56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor |
GT-96300-3656-T2-AP (Desktop, non Hybrid) Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor | Desktop/External | 100-240V~, 50-60 Hz | 36 | 56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Gigabit Power over Ethernet (IEEE802.3at PoE PSE) Power Supply AC Adaptor |
GT-96600-7056-T3-AP Non-IEEE 4PPoE | Desktop/External | 100-240V~, 50-60 Hz | 70 | 56 V | USA DOE Level VI / Eco-design Directive 2009/125/EC, (EU) 2019/1782 | Non-IEEE 4PPoE |