3COM Switch 4800G PWR 48-Port console login via Roll over and getting IP

I am using “3COM Switch 4800G PWR 48-Port” and I want to get its IP to manage it via web.
My switch is connected on network and getting IP from DHCP windows server but when I scan IP or my network its not coming in scan.
Now I want to connect it with Console(RJ45-to-RJ45 roll over cable) but when I connect it with roll over cable link is not going up.
Please help me to get IP of this switch via console. I have only RJ45 port on my laptop to connect with console.
nainasipraAsked:
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jfradyCommented:
If you can't find the IP by scanning the network look in your DHCP server to find the lease IP info by the MAC address of the switch.

If you do not have a DB9 serial connection on your laptop you will need a USB/Serial convertor.  The RJ45 on your laptop is Ethernet and not a serial connection.
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