Ethernet packets

S

Schmark

Getting the hang of it
Apr 15, 2016
106
8
USA - California
Cabling between IP cameras and NVR is Ethernet 8 wires. Commands go from NVR to Camera and data goes from Cameras to NVR, supposedly on different wires.

Is there a link showing the content of the command and data packets that are traveling on the cable? For example, are Main stream and Sub stream sent concurrently to the NVR on the same wire?

Thanks

-S
 
Schmark said:
Cabling between IP cameras and NVR is Ethernet 8 wires. Commands go from NVR to Camera and data goes from Cameras to NVR, supposedly on different wires.

Is there a link showing the content of the command and data packets that are traveling on the cable? For example, are Main stream and Sub stream sent concurrently to the NVR on the same wire?

Thanks

-S
Click to expand...
That is incorrect. All data is passed on the same wires.
 
Schmark said:
Fenderman, I wired my system with T568B. Would you know which mode (see below) is used by the Hik cameras/NVR?

View attachment 42924
Click to expand...
Most likely Mode A. In general standard poe switches will use mode A and midspans will use Mode B. There is an easy way to test - just cut the pin 4,5/7,8 cables and see if it works
 
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Mode B makes sense as it shows Tx and Rx on the same wire pairs. To go one step further, is there documentation showing packet content? I am interested how command, Main stream, and Sub stream are interleaved (and marked).
 
Schmark said:
Mode B makes sense as it shows Tx and Rx on the same wire pairs. To go one step further, is there documentation showing packet content? I am interested how command, Main stream, and Sub stream are interleaved (and marked).
Click to expand...
You would have to use wireshark, it is using the 10/100 modes not gigabit. The cameras are not gigabit.
 
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