SOURCE: i cann't connect to my switch
Your superstack 3 should have a 9 pin male connector at the back labeled "console port" you need to connect this to your serial interface on your pc or laptop. With 3Com you also need to set your baud rate to 19200 as this the default for 3Com.
SOURCE: My 3com 4200 28 ports is restarting by itself many
Base from the description of your problem its only showing that some of the port on of your Ethernet switch is already getting bad and this usually happen on switch like this and eventually all port will go bad and will lead to the replacement of the device. With this type of problem you can first try to adjust the speed of your network card to 10 half duplex and check if that will correct the connectivity problem and if it does its just a sign that sooner or later the device is already getting bad and since its only a switch there's no firmware that we can load to it or even a reset button to bring the device back to its default settings.
SOURCE: 3Com Baseline Switch 2024 - Switch - 24 ports
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 ?
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