Lower than expected bandwidth - OAK-D PoE

AshS1T2

Hello,

I've ran the oak_bandwidth_test.py script, it is reporting around 550Mbps down, 260Mbps up, but the PoE deployment guide documentation states I should be seeing around 800Mbps down.

I also ran the other scripts, and they seem to be reporting the expected values.

Connecting to  192.168.1.55 ...
mxid: 19443010B125AE2F00 (OK)
speed: 1000 (OK)
full duplex: 1 (OK)
boot mode: 3 (OK)

Sending buffer 0
Sending buffer 1
Got 1. buffer, latency 1.01 ms
Sending buffer 2
Got 2. buffer, latency 1.00 ms
Sending buffer 3
Got 3. buffer, latency 2.01 ms
Sending buffer 4
Got 4. buffer, latency 2.00 ms
Sending buffer 5
Got 5. buffer, latency 1.01 ms

Our network gear should be overkill:

Router - Ubiquiti Dream Machine Special Edition
Switch - Ubiquiti Pro Max 24 PoE

I've connected the camera to a 2.5G port on our switch, and connected my PC's 2.5G port to another 2.5G port using a cat8 cable. I also tried connecting just the camera and my PC to another switch (1G PoE) and saw similar bandwidths.

Are these speeds expected? If not, what could be causing this, and how could I isolate/debug this issue?

Thanks.

AshS1T2

Just an update, I tried running the bandwidth test script on a linux machine and I got much closer to the expected values, 880Mbps down, 230Mbps up, but not consistently.

I'm also getting various warnings, errors and a crash most times I run the script.

python3 oak_bandwidth_test.py
[19443010B125AE2F00] [192.168.1.55] [1753666240.508] [host] [warning] Monitor thread (device: 19443010B125AE2F00 [192.168.1.55]) - ping was missed, closing the device connection
F: [global] [    242508] [Scheduler00Thr] tcpipPlatformWrite:300        Cannot find file descriptor by key: 56
[19443010B125AE2F00] [192.168.1.55] [1753666260.660] [host] [warning] Device crashed, but no crash dump could be extracted.
Traceback (most recent call last):
  File "/home/dauntless/oak/oak_bandwidth_test.py", line 74, in <module>
    qout.get()
RuntimeError: Communication exception - possible device error/misconfiguration. Original message 'Couldn't read data from stream: 'xout' (X_LINK_ERROR)'

python3 oak_bandwidth_test.py
Downlink 631.1 mbps
Uplink 230.5 mbps
Press any key to continue...[19443010B125AE2F00] [192.168.1.55] [1753666406.217] [host] [warning] Monitor thread (device: 19443010B125AE2F00 [192.168.1.55]) - ping was missed, closing the device connection

AshS1T2

Another update, I am able to get stable speeds with no errors or crashing with everything connected to the 1G PoE switch (TP-Link TL-SG108PE), and running the script on a linux machine. So I guess I have two issues, some kind of configuration issue on our Ubiquiti switch or router, and not being able to hit the maximum bandwidth on windows.

jakaskerl

AshS1T2
I'd check if your networking is set to full-duplex. I've seen such issues on half-duplex.

Thanks,
Jaka

AshS1T2

jakaskerl
I have tried setting the NIC to 2.5Gbps Full Duplex, but it didn't seem to make any difference. Also the poe_test.py script does output full duplex: 1 (OK)

I tried a USB-C ethernet adapter and I'm able to hit the expected bandwidth with it on the same PC, so I wonder if its a driver issue or setting that's causing this.