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bcruze

join:2006-03-03
USA
Reviews:
·Windstream

1 edit

cables shorted plugged into sagemcom1704 in bridge mode

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Why is it when the modem is in bridge mode I get a shorted connection error when I run broadcom cable test diagnostics?

-it says pair 1-2 are good but 3-4 g.gw.b.bw are shorted?

-I have a screen shot attached hopefully

-at least 2 of the 4 ports gives this message

-the same cable plugged into a different router do not show they are shorted.

slacklin

join:2009-09-11
Dahlonega, GA

is it possible youre accidentally using a crossover cable? some routers auto correct for them and wouldnt show an error?


bcruze

join:2006-03-03
USA

im am not using a crossover cable.

it does this on any patch cable i use


LostInWoods

join:2004-04-14
Reviews:
·Windstream

Typical 10/100 Ethernet equipment short the pairs this way. Pair 1 is wired to pins 1&2 of the RJ-45, and Pair 2 is wired to pins 3&6. Pair 3 is shorted together on pins 4&5 and Pair 4 is shorted on pins 7&8. Pairs 1 & 2 go to transformers that feed Tx & Rx to the Ethernet PHY, and the others pairs are terminated into a "Bob Smith" termination, as are the center taps of the transformers for pairs 1 & 2.

When you go to gigabit connections, all four pairs are used for data, but a 10/100/1000 PHY will understand that it's connected to a 10/100 PHY if the pairs are shorted. I hope that all made sense.


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