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October 13th, 2023 13:51

PowerConnect 3448p - no console output

I have an older PoE switch which was working fine but since it lost power (not a spike) and rebooted I can no longer get any response on the console port or from the assigned management IP address on any port.

The G3 and G4 ports are also no inactive.

I'm using a null modem cable but I see no output in Putty when I power up the switch.  Is there any way to reset the unit (there is a reset button on the front) back to factory defaults?  I can't see much information in the user guide about how to use the reset button to do this.

Why would there be no output on the console port? 

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3.1K Posts

October 13th, 2023 19:31

Hello Chris,

 

Reset button is a just a reboot function.

 

Try removing all power and NIC cables for two minutes, reconnect and try again.

 

Try different baud rates. Try the highest and work your way down

1200, 2400, 4800, 9600 should be default, 19200, 38400, 57600, 115200

Page 57 Connecting the Terminal to the Device

https://dell.to/46l6bVn

 

Try a different cable. If you need one this is our part number:

Serial Cable PN#8H427 - ASSY,CBL,I/O,SER,PWRCNT

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October 16th, 2023 13:59

Hi Charles,

Thanks for the pointers.  I tried all of those speeds but still only got a few (between 1 and 10) random characters when powering on the switch.

I've tried another cable and I'm pretty sure they are correctly wired.  I read that a null modem cable will feed back the typed characters to Putty when pins 2 and 3 are connected to each other.  This is the case for the cable I'm using.

I'm still struggling to get any meaningful output from the switch when it powers on.  Any further ideas please?

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16-10-2023 02:33 PM

Hello Chris,

 

How did draining the power work for you?

removing all power and NIC cables for two minutes, reconnect and try again.

DELL-Charles R

Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell

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October 16th, 2023 14:52

@Dell -Charles R​ No luck I'm afraid. I have no network cables connected, just a power lead and console cable.

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16-10-2023 03:36 PM

Do all other port, except G3 and G4, get link/activity lights?

 

What is the status of the Diagnostics (DIAG) LED:

Green Flashing - The system diagnostic test is currently in progress.

Green Static - The system diagnostic test passed successfully.

Red Static - The system diagnostic test failed.

OFF - The system is operating normally.

DELL-Charles R

Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell

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October 17th, 2023 07:53

At power on, yes, all other ports briefly have the link/activity light on.

FAN and PWR come on (and stay on) but nothing on DIAG.

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October 17th, 2023 10:19

The unit isn't working as a basic switch either despite the port lights coming on when a cable is connected.  Just trying to ping another IP address across the same subnet doesn't work.  I have tried the same with a different switch and it works so I know the two devices aren't blocking traffic.

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17-10-2023 01:03 PM

Hello,

after all those test suggested i think that there is a hardware failure on the switch. If you connect a serial cable it should show you the output while booting. I don't see any other step to trouleshoot this sorry.

Thanks

DELL- Marco B

Social Media and Communities Professional

Dell Technologies | Enterprise Support Services

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October 17th, 2023 15:00

Thanks, I feared that might be the case. It hadn't been used for a while and then was used for a short period (24-48 hours) before some ports didn't seem to work.  I wasn't sure if the configuration was causing the issue as some ports might have been segmented but I think it was showing signs of failure.

I guess it's not worth trying to find a repairer but buy another switch?

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17-10-2023 03:05 PM

We could try confirm a couple more things.

 

Could you confirm the settings and cable you are using:

 

In putty is this what you are using?

Set the data rate to 9600 baud.

Set the data format to 8 data bits, 1 stop bit, and no parity.

Set flow control to none.

Under Properties, select VT100 for Emulation mode

 

 

Are you using the cable that came with the system?

If you need one this is our part number:

Serial Cable PN#8H427 - ASSY,CBL,I/O,SER,PWRCNT

 

In the end you may need to replace it.

This is not a Dell site and Dell has no affiliation with it.

I'm just providing so you can see what it cost at this place:

https://dell.to/46wwOGN

DELL-Charles R

Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell

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October 17th, 2023 16:01

Yes those are the serial settings I'm using.

I don't have Properties in Putty but under Terminal > Keyboard, I'm selecting the option under "The Function keys and keypad" as VT100+

Under Connection > Data, I'm changing the Terminal-type string from xterm to vt100

I'm not sure if I was using the cable that came with the system but I've purchased a new null modem cable and still no joy. I read that you can check it's the right pin configuration by looping pins 2 and 3 and seeing if the keystrokes are displayed in Putty (which they are) so I assume it's the right cable.

Thanks for the link, I'm in the UK but I can find a refurb unit here too. I think that'll be the way to go and this one will go for recycling.

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