6.2 Example Application without PoDL

The example application uses five nodes with the same hardware on each node. The hardware used is the same as with the PoDL setup, with only the PoDL power supply boards missing. Power is instead supplied directly to the boards using USB cables.

The following eye diagram measurements were done on the TRXN and TRXP pins of a LAN8651. These measurements were done for each combination of transmitter and receiver (i.e. Node 0 transmits and Node 4 receives, Node 0 receives and Node 4 transmits). The resulting eye diagram matrix is shown below in Figure 6-7.

It is clearly visible that the worst case scenario for this mixing segment is when Node 0 transmits and Node 4 receives, or vice-versa. In either case, a jitter of about 2 ns exists on timing of signals with a maximum eye-opening of about 415 mV and a signal noise of about 1.5 mV.