Seller:iksound-9✉️(20)100%,
Location:Barking, GB,
Ships to: GB,
Item:404670028812Cisco HWIC-4ESW Cisco 4-Port Fast Ethernet Network Module HWIC-4ESW. 4 port switch expansion card for cisco routers Check compatibility with your particular device, it does fit in the 1921 routers If your device supports HWIC then it should work