PowerConnect 2824 Ports SFP does not

We bought a new switch 2824 with a corresponding to SFP module replace old 2724 PowerConnect and SFP module.

After the configuration of the switch and installing it, we were able to get a connection on our uplinked to fiber.
SFP light illuminates and flashes from time to time, and the switch detects correctly module SFP is inserted and that the fiber is connected.  We can see the insertion of the SFP is detected and the switch for change of fiber mode by looking at the output of the console, and the web administration port status page lists the port as "ComboF" when the SFP is inserted and the fiber is connected.

However, the switch always indicates that the port State is down.  (The port is not administratively disabled.)

The old switch works very well with the old SFP module.  The new switch does not work with the old or the new module SFP.  We tried two combo SFP ports.  We also checked that the fiber itself is fine. We cannot get the new switch to display the drop-down list port status that up when you use the SFP. We tried to completely reset the new switch by removing the configuration file via the boot over the serial connection menu and re-run the initial configuration wizard, but the port still won't go up.

Any ideas?

After a few tests yesterday, we determined that part of auto-negotiation must be disabled for switch work with our copper and fiber Media converters.

The 2724 works very well with our media converters, with auto-negotiation enabled.

The 2824 works very well with auto-negotiation enabled when it is connected to an another SFP transceiver in building switch.

But when we introduce the Media Converter in the path, the 2824 will bring only the link up if you disable auto-negotiation.

So far, everything looks good.

Tags: Dell Switches

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