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RJ-45 8P8C Reverse Inline Coupler - Beige
RJ45 Cat5 Ethernet cable coupler.
Reverse couplers reverse the right to left order of the pins inside the connectors. This coupler has 8 pins for RJ45 connectors.
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PROS: Good Price
CONS: Not Cat5e rated, you can pull apart and see that.
Also this is reversed wired for connecting two 100mbs PC's together
Not for extending a Cat5e cable
1 - 3
2 - 6
3 - 1
4 - 4
5 - 5
6 - 2
7 - 7
8 - 8
This makes them usable to couple two Ethernet patch cables to make a crossover cable for 100mbps Ethernet, but not for gigabit Ethernet. (They aren't anything even remotely constant impedance, but would probably be OK to couple short cables.)
For more info on crossover connections, check Wikipedia for "ethernet crossover cable" (sorry, no link, since I don't know if they are permitted in reviews)
The plastic shells can be easily snapped open and closed, for anyone ambitious enough to cut an splice wires to make a custom coupler.
PROS: Inexpensive, seem of reasonable quality
CONS: A mixture of reverse and straight through.
This does not "reverse" (aka rollover) the pins. Like others have said: the pinout is for crossover. I don't know why they call this product "reverse" and the other one "crossover" when they are designed the same. Bought 20 of these and was about to order 200 more when we noticed the mistake and now have to delay our project.
(Ordered in Q1 of 2016, hopefully they fix this)
is a decent non-cat5e crossover adapter
CONS: wrong description and title
FYI: Gigabit-ethernet per standards requires auto-mdix and therefore, you can use an ordinary patch cable.
PROS: Very inexpensive and does the job.
CONS: As noted in the description, this coupler reverses the pin order of the connected RJ-45 cables. Hence a pair of standard cables linked through the coupler becomes a cross-over cable. Alternately, a cross-over and a standard cable linked through the coupler works as a standard cable. Many current generation devices will automatically correct for reversed pin order, but older hardware can't cope. If necessary, you can use a pair of these couplers in your cable run to create a kludgey but functional straight-through cable.