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Powered USB Hubs

Typical Devices

DSCN0519sac.png

Older Devices

Some older hubs were not powered by 5V DC supplies eg:

"Present Day" Device Examples

These can either be "bus-powered" or powered externally by a 5V DC supply (not always provided). Some of the cheaper devices may not have the power socket fitted but are cosmetically similar to the "powered" variants:

Test Results

(See also Gembird USB 2.0 Switching Hub, Hub Port-to-Port Resistance Checks and USB Power Supplies)

Basic Tests of PSU/Hub behaviour using the USB Power Supply test kit:

OEMHub.jpg

FX1000mAandHubs.jpg

PSU Spec.: 6V DC 2.1A (under load behaviour here)
At Hub, Slope resistance: 0.39 Ω1, Vmax: 4.73 V2

PSU only, Slope resistance: 0.25 Ω1, Vmax: 4.91 V2
+ Generic Hub, Mean slope resistance: 0.73 Ω1, Mean Vmax: 4.49 V2
+ Sweex Hub, Mean slope resistance: 0.76 Ω1, Mean Vmax: 4.17 V2

7PortHub.jpg

SweexHub.jpg

PSU only3, Slope resistance: 4.7 Ω1, Vmax: 3.0 V4
+ Hub5, Slope resistance: 5.5 Ω1, Vmax: 2.5 V4

PSU only3, Slope resistances: 0.84 Ω6, 35 Ω7, Vmax: 3.8 V4
+ Hub5, Slope resistances: 1.3 Ω6, 41 Ω7, Vmax: 3.2 V4

Extended Tests of Computer (Acer Netbook or 'Pi) / Hub / External PSU behaviour using the modified test kit:

AcerPoweredHubs.jpg

AcerPoweredHubsTCB.jpg

AcerHama.jpg

AcerHamaTCB.jpg

AcerHamaiLuvi108.jpg

PiHamaTCB.jpg

Conclusions

TBD


  1. Between 2nd. & 7th. data points (1 2 3 4 5 6)

  2. Imax 1000mA (7 8 9 10)

  3. After taking account of adapter cable resistance of 1.58Ω (11 12)

  4. Imax 500mA (13 14 15 16)

  5. W/o adapter cable (17 18)

  6. Between 2nd. & 5th. data points (19 20)

  7. Between 6th. & 8th. data points (21 22)


2014-09-01 16:20