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2910al and older POS systems

Marco Koch
Occasional Contributor

2910al and older POS systems

Hello,

we have implemented some 2910al-48 PoE - switches at a customer. We replaced Cisco 2940 (10/100) switches with them.

Now we have the problem that some (older) POS systems (NICs: RTL8100C, RTL8139C and AMD PCNet AM79C970AKC) are loosing connectivity. Sometimes they work sometimes they don't. When I connect the to an old unmanaged 5-port 10/100 desktop-switch and connect this switch to the 2910al everything works fine. I have tested all different speed and duplex settings without success. When I ping the IP address of one POS-system and reboot it, I can see that about 5-6 pings are working after the POS-system has booted up and after that the pings are timing out.

The NICs are 10Mbit/s or 10/100Mbit/s but as I said, autonegotiation does not work and also manually defineing the speed does not solve the problem.

The POS-systems are booting a (old) MSDOS with TCPIP-stack.

Does anyone have these problems or better a solution?

Marco
3 REPLIES
cenk sasmaztin
Honored Contributor

Re: 2910al and older POS systems

connect straing true cable with pos device on switch interface 1 and write this command


switch(eth-1)# mdix-mode mdix

and make retest
cenk

cenk sasmaztin
Honored Contributor

Re: 2910al and older POS systems

Marco Koch
Occasional Contributor

Re: 2910al and older POS systems

Hi,

thanks for the reply, but I'm sorry it doesn'T solve our problem.

It's still the same ... I boot up the POS and I can ping it for 3-5 times than I can't ping it any more ..

Connecting it back to an old FastEthernet Miniswitch and everything works fine ...

Marco