Typically a PoP could be defined as either an individual provider being brought into a facility or the location of a group of providers entering the facility (m

Typically a PoP could be defined as either an individual provider being brought into a facility or the location of a group of providers entering the facility (meet me room). In this instance I think they mean an individual provider (for example Level3) bringing in a feed into a data center. You would then get multiple feeds from distinct providers. Each feed would require a router for termination, and this router is typically using BGP. Since you keep multiple providers having redundant routers on each feed isn't always necessary. But there are cases where I've seen a single feed being served by redundant routers using something like VRRP. After that you would take feeds from the boarder router into our inner/core switch fabric to be distributed throughout your network. It just depends on the level of redundancy you want at each layer.