Why does my home network only work with one type of cable termination

Home Security Systems Forum Smart Home Security Systems
21

@Leon
That’s a good point. My tester might only be checking for continuity, but it does confirm a connection.

22

@Clark
Auto MDI/MDIX technology has been a standard feature for years, removing the need to differentiate between regular and crossover cables.

23

@Clark
A 568A/B mismatch does technically create a crossover cable, but it’s only fully compliant for gigabit connections if all pairs are flipped, not just the orange and green pairs.

24

For best results, make sure both ends are terminated in the same standard, either all A or all B. Mixing might work sometimes, but not always.

25

Just keep the termination consistent at both ends. It doesn’t matter whether it’s A or B, as long as both ends match. Using standard cables like B to B or A to A should work without issues.

26

Noah said:
Just keep the termination consistent at both ends. It doesn’t matter whether it’s A or B, as long as both ends match. Using standard cables like B to B or A to A should work without issues.

I tried A at both ends, and there was no link from my modem to the router. When I switched the garage end to B, the router connected but the line test was off.

27

@Clark
It sounds like user error. The difference between A and B is just a swap of two pairs of wires. It shouldn’t matter unless there’s a physical crossover in the cable.

28

Miltan said:
@Clark
It sounds like user error. The difference between A and B is just a swap of two pairs of wires. It shouldn’t matter unless there’s a physical crossover in the cable.

I double-checked after the A termination and it passed the line test but still no router link. I’m new to this, so maybe I’m missing something.

29

@Clark
There shouldn’t be any difference technically as long as both ends are the same. Have you tried restarting your devices? They might need to reset after changing cable types.

30

Guard4Hire said:
@Clark
There shouldn’t be any difference technically as long as both ends are the same. Have you tried restarting your devices? They might need to reset after changing cable types.

I restarted the modem but can’t remember if I did the router.

31

@Clark
Double-check your terminations and make sure the pairs are correctly arranged according to either A or B. It’s also good to make sure all your cables follow the same standard for ease of future troubleshooting.

32

It’s likely that your initial B termination was faulty, and the successful A termination afterward simply aligned with how your modem compensates for crossover configurations.