Tagged Questions
11
votes
3answers
313 views
Do magnetics connectors exist?
Conventional connectors, where the plug and socket have metal parts which touch, suffer from the following problems:
Limited mating cycles or expensive plating.
Impedance mismatch (relevant for high ...
4
votes
1answer
223 views
Is there a standard Ethernet Connector?
I am looking for a PCB mount RJ45 connector. I find that there are about 10-12 types of RJ45 connectors( 6pin, 8 pin, 10 pin, 12 pin, 14 pin ). Even the PCB footprint is different for some connectors ...
5
votes
2answers
742 views
Which pair of an Ethernet cable does a router transmit on?
I've seen numerous articles about straight-through and crossover cables and why they are needed. With conventional straight-through cabling, one device transmits on pair 2 (pins 3 and 6) while the ...
11
votes
1answer
251 views
Reasoning behind Ethernet pair order
An Ethernet connector seems to use a surprising choice of signal placement in its RJ45 connector. Does anyone know the reasoning behind:
The decision to make pair 2 straddle pair 1?
Why Ethernet ...
5
votes
3answers
2k views
How important is the shield on an RJ45 connector?
If I am going to use a PCB mount RJ45 connector for 100mbps Ethernet, does it need to be a shielded connector, or can I get away with using an unshielded one?
Is there some standard which deals ...
4
votes
3answers
364 views
For remoting 1000Base-T ethernet connector, is it better to remote PHY from magnetics or magnetics from connector?
I'm in need of remoting the gigabit ethernet connector from the main board to a back end board that has all the other connectors. I plan on doing this with a high speed board to board connector ...
