The Cisco 1841 is a 100mbs router.
The building has a 400mbps line.
My question is can I connect the Cisco 1841 to a 400mps line directly without any configuration or hardware changes for 400mps? We only need a 100mps line output. Trying to avoid a new router when not needed.
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The 400Mbs circuit is likely to be delivered via a Gigabit port - and you are not likely to have a Gigaport on an 1841. Unless the provider has configured it as a auto-speed port so it will step down to 100Mb/s the answer would be no.
The Cisco 891F is a lower cost option with a Gigabit WAN port and will easily manage 100Mb/s of throughput. It would certainly beat an 1841 hands down performance wise.
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If you go by Cisco recommendations, they recommend 89x for 15 Mbps and a 1941 for 25 Mbps, but you might want to read their whitepaper, which I've attached, for yourself.