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28 pin (24+4) Lenovo Onelink connector layout
28 pin (24+4) Lenovo Onelink connector
Supports USB 3.0 and DisplayPort. Often (but not always) paired with a proprietary thin DC power connector.

Odd numbered pins: DisplayPort lanes 0 and 1 (2 dedicated lanes - it is possible that other pins are intended for additional lanes)

Even numbered pins: USB 2.0, USB 3.0, other power and signaling

Known uses:

  • Lenovo OneLink docking stations
  • Gigabit ethernet adapter
  • Ethernet / VGA adapter
Pin
Number
Pin
Name
Description
1 Ground  
2 Power Button For the power buttons on Lenovo docking stations
3 ML_Lane0(+)  
4 Return/Detect  
5 ML_Lane0(-)  
6 VBUS(500 mA)  
7 Ground  
8 USB2.0(+)  
9 ML_Lane1(+)  
10 USB2.0(-)  
11 ML_Lane1(-)  
12 Ground  
13 Ground  
14 USB3.0_Rx(+)  
15 AUX_CH(+)  
16 USB3.0_Rx(-)  
17 AUX_CH(-)  
18 Ground  
19 CONFIG1 (no connect)  
20 USB3.0_Tx(+)  
21 DOCK_CONSUMP  
22 USB3.0_Tx(-)  
23 HOT PLUG DETECT  
24 Ground  

Pins are arranged in two rows on the connector, with USB and DisplayPort pins separated by side:

Position No. Definition Position No. Definition
1 Ground 2 Power Button
3 ML_Lane0(p) 4 Return/Detect
5 ML_Lane0(n) 6 VBUS(500 mA)
7 Ground 8 USB2.0(p)
9 ML_Lane1(p) 10 USB2.0(n)
11 ML_Lane1(n) 12 Ground
13 Ground 14 USB3.0_Rx(p)
15 AUX_CH(p) 16 USB3.0_Rx(n)
17 AUX_CH(n) 18 Ground
19

CONFIG1 (no connect)

20 USB3.0_Tx(p)
21 DOCK_CONSUMP 22 USB3.0_Tx(n)
23 HOT PLUG DETECT 24 Ground
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Lenovo ThinkPad OneLink docking port visual pinout:click to enlarge
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