09-04-2016, 08:55 AM
With the PocketEthernet, I identified some cables getting 1% BER (Bit Error Rate) at 1000 Mb/s, but that was having minimal impact, although I did make sure I didn't use those cables for further testing. The flat CAT7 cable that I got seemed to have the best characteristics.
On the connection, blue and orange pairs are solid, but I am often seeing open on brown and sometimes on green, and frequently some interference on green which is interesting. I'm going to see if I can find Charles Spurgeon's excellent Ethernet website and see if it has more specific information on the role of the different pairs. I do know that only 2 pairs are used for negotiation, so a gigabit connection may be negotiated even if there's a problem with using gigabit on the other 2 pairs.
On the connection, blue and orange pairs are solid, but I am often seeing open on brown and sometimes on green, and frequently some interference on green which is interesting. I'm going to see if I can find Charles Spurgeon's excellent Ethernet website and see if it has more specific information on the role of the different pairs. I do know that only 2 pairs are used for negotiation, so a gigabit connection may be negotiated even if there's a problem with using gigabit on the other 2 pairs.
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