We have ordered only 3 SW's - MS210-48FP connecting with 39 Cisco Phones.2 going to be stacking at Ground Floor & 1 SW goes to 1st Floor, Please advise the following Cabling part between Stack Switches and 3rd Switch ? Ground & First floor SW required separate WAN Link ? or we can connect WAN to Stack Switches from there we can connect to 3rd Switch?.
You don't need a separeted WAN Link, plug any one of the Ethernet or fiber ports into an upstream device on your LAN. The uplink port should have access to a DHCP server and it will also need to be able to communicate with the internet.