What is default ip address for 3com baseline switch 2024

A very simple solution to r epairing all by yourself is getting help from handbooks, they're very detailed and complete in every way so for me it was my b est source to repair
one of the top sites for this is https://big-manuals.com/

Connect the console cable, open a connection to the serial port via a utility such as PuTTY, and do the following:
1) Enter the user name "recover" and password "recover" to place your unit in password recovery mode. The unit will remain in password recovery mode for 30 seconds max.
2) Perform a hard reset by removing power, waiting 10 seconds, and then re-applying power.
3) Once the switch has rebooted, enter a new password for the "admin" user account.
4) Enter enable to leave password recovery enabled, or enter disable to turn it off. You are now logged in as the default "admin" user.
Note: If password recovery has been disabled, the only way to recover access is to return the switch to 3com.

Power it down for a few minutes and try it again

Try 'admin' (all lower case as the 'user').

The default IP address of the device, depends on the status of the network where the device resides, but if the device is not connected to the network, or no DHCP server exists in the subnet where the device resides, you can get the default IP address of the device on the label on the right of the device rear panel.

Is it hsappening with all the 24 ports or with some ports ?

Might be an indiacation towards the duplex mismatch.
are you getting CRC errors on the interfaces ?

the switch contacts have probberly arked and burnt away, u/s new switch needed

i can't set ip address over 4 vlans. the 3com switch 4500 always give error message "there's not enough routing resources available".please help....

page 22 of the 3com user guide for your switch talks about how to use the console cable and how to connect to your pc, I included the link below for your manual, if you don't have it:

http://support.3com.com/infodeli/tools/switches/baseline/3Com_Baseline-Switch-2916-2924_User-Guide.pdf