A router with PoE switch ports is only as useful as the power behind it. The Cradlepoint 170751-000 is the supply that makes the AER2200's PoE capability real: 54 V DC output at 3.3 A, supporting a 120 W PoE budget across the router's powered ports. That budget is the number deployment planning revolves around. Access points, IP phones and cameras each draw their PoE class allocation, and the supply must cover the router plus everything it powers. With 120 W available, an AER2200 site can run a realistic complement of powered devices — several access points and phones — without a separate PoE switch, which is precisely the consolidated-branch design the AER series targets. As a replacement part, the 170751-000 matters in a different way: when a PSU fails, the branch loses not only routing but every PoE device the router feeds. Sites built on AER-class hardware should treat this supply as critical spares stock, because a generic 54 V brick of uncertain capacity risks brown-outs exactly when powered devices negotiate their loads. Order by part number and match to your platform documentation: MPN 170751-000, UPC 804879607700, cataloged for the Cradlepoint AER2200 advanced edge router, made in Taiwan, approximately 0.85 lb shipping weight. If your deployment powers many high-draw devices, audit PoE class allocations against the 120 W budget during design rather than after installation.