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CISCO SWITCHES FOR SMALL and MEDIUM BUSINESS

Introducing the next generation of Cisco Small and Medium Business Switches. Cisco is refreshing its SMB Switch portfolio. Click here  to learn more.


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per Beginner
Beginner

Green ethernet short reach result in port not connecting(no Link)

Hi

I noticed problem with connection of a computer.

Same connection had worked without a problem before.

DHCP failed due to no connection resulting in windows7 assigning a IP address, no network

When inserting RJ45 the Green link led turned on for a brief moment.

Only got a 100Mbit FD connection after some jugglinng with rj45 in both ends.

In case of  oxid building over nigth

The cable is more than 10 meters.

A fluke network tester had problem connecting to ports with a 1 m cable.

This usually means autoneg problem or low voltage.

When I turned off green ethernet/short reach  for the switch(sg300-20) and  I got a 1000Mbit FD without a problem.

I have previously noted that the voltage on the transmitter from the switch is on the low side using a Fluke network tester.

I got around 0.5 V and I prefer much higher.

I guess turning green features on and trying to use a longer cable is to stretch the luck  a tad to much.

/Per

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