3Com Baseline - Recent Questions, Troubleshooting & Support

https://community.hpe.com/t5/Comware-Based/Firmware-for-3com-Switches/td-p/7000310#.YPrrkI5KiUk https://www.google.com/search?q=2948-SFP+Plus+firmware ..

Don't let the switch name fool you, HP calls it the HP 1910. HP 1910 48G Switch Fixed Port Web Managed Ethernet Switches HP JE009A ABA Technical Notes: "The HP 1910-48G Switch (JE009A) was formerly sold as the 3Com Baseline Plus 2952 (3CRBSG5293) and may ship with this product labeling.SFP ports and copper ports work simultaneously, independent of each other to give a total of 52 Gigabit-capable ports." Firmware download from HP: My Networking HP Official Site

Power it down for a few minutes and try it again

3Com is owned by HP now.Here is the manualhttp://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02581570/c02581570.pdf

The keyword to look for is "HP 1910-48G Switch" 2952 SFP 3CRBSG5293 Firmware

this could be a problem with the second switch unit. what happens if you connect a pc to this cable, is that intermittent, if so, that is your problem. try fault finding with a LAN cable tester to see if there's any issue with the link cable.

To make it a factory reset, you have to enter its service mode option. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/ Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.