Question about 3Com 3C16985B /REF3COM SSII 24-PORT SWITCH (3C16985BREF)

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Link and activity lights on 3Com Switch ports without connection

I have this problem with three 3Com switches. There are link and activity lights on ports that have no cable connection on them. The lights remain on and blinking even when I remove the RJ45 plug. how can I repair the switch.

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  • 47 Answers

Do the ports work when the cables are connect?  I did some re-search and this seems to be an ongoing issue with 3com switches.  It should not effect the use of the switch

Posted on Oct 27, 2007

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Posted on Jan 02, 2017

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2 Answers

3com Switch Intermittently Losing Connection.


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.

Jul 16, 2013 | 3Com Baseline Switch 2024 24-Port...

1 Answer

HI, I have two 3com patch panels 3C17302 Superstack 3 Switch 4250T, connected to a switch panel. One of the patch panels does not work e.g. the connected pc's are not able to have Lan connection. Only...


I don't know anything about these units, nor do I have time to source any docs for you, but maybe you can try connecting a PC directly to the port your patch panel is connecting the the switch from, you can at least see if that port is working.
My next and only other suggestion is to invest in a "LAN cable tester". In my area, you can find cheap ones for U$20.
The tester will allow you to check connectivity between any two ports, and allows you to test both patch links and individual CAT5/6 cables.
Good luck!

Nov 22, 2017 | 3Com Computers & Internet

1 Answer

3Com Baseline Switch 2024 - Switch - 24 ports duplex light blink continusly


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 ?

Dec 05, 2010 | 3Com Baseline Switch 2024 - Switch - 24...

1 Answer

I have a 3com 4500 connected to 2 5500s (A & B), which are the the GWs for the 4500. I issued on the 4500: ip route-static 0.0.0.0 0 192.168.0.254 preference 60 (5500 A) ip route-static 0.0.0.0 0...


From your scenario what i guess is the two 5500's (A&B) are connected to each other also. Thats why the link between B&4500 is remaining down due to STP ( to avoid Network loop).
Please correct me if I am wrong.


What is the status of the link connecting 4500 to 5500 B when 500A is active and when 5500A is down .

If you are running STP i will suggest you to wait for 2 minutes after 5500A goes down and STP will be recalculated and the link connecting to 5500B will become active and then the route will also become active.

Best regards

Nov 02, 2010 | 3Com 4500 24-Port Ethernet Switch

1 Answer

Connecting a 3Com 2952 Plus switch to a Cisco 3750 switch


If you also have a standard copper cable (or a second fibre cable) connecting the two switches (for resilience perhaps?), this issue is probably being caused by something called Spanning Tree. This is implemented on switches as a 'loop avoidance' system, and can look like you have described with one end 'ip' and the other end no lights.

On the Cisco switch, get to a telnet/ssh/console session, log in and enter show spanning-tree and press enter.

have a look to see if the fibre interface has a status (sts column) of BLK. If it has, then this is called 'blocking' and will remain like that until you remove the second link to the other switch.

Hope that this has helped!

Mar 03, 2010 | 3Com 3CSFP91 Transceiver

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Uplinking Using Gig Copper


hello, use the plugin modules for the rj 45 connection port to uplink it.

Aug 04, 2009 | Computers & Internet

1 Answer

CONNECTIVITY PROBLEM WITH 8 PORT D-LINK SWITCH FOR MORE THAN 3 PC


First thanking to using d link switch


Tell me Your dns

and using pppoe ya proxy


KETAN PATEL

Mar 11, 2009 | D-Link DES-1008D 8-Port Ethernet Switch...

2 Answers

I cann't connect to my switch


The primary connection method for those switches would be serial connection. In the box there should have been a DB9 serial to RJ45 cable. Hyperterminal default settings would allow you to connect.

Jul 25, 2008 | 3Com 4500 24-Port Ethernet Switch

1 Answer

Enter the switch configuration


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

Jun 18, 2008 | 3Com Computers & Internet

2 Answers

D-Link Switch


well in your case, somethings wrong with your switch, because it doesnt work in a full scale operation, it will just work for 20 mins, well, theres no existing kind of performance like that.

you better replace that one with another brand. well, you try to use 3com or CISCO, well you could use linksys, its from CISCO but catering the small business side.

Mar 13, 2008 | Computers & Internet

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