2022-05-09 定格消費電力 Procurement eikaiwa.dmm.com ja.wikipedia.org https://www.cisco.com/c/ja_jp/td/docs/sw/campuslanswt-access/cat2960-xrswt/ig/001/b_c2960xr_hig/b_c2960xr_hig_appendix_0101.pdf