{"id":11170,"date":"2026-01-03T10:41:53","date_gmt":"2026-01-03T15:41:53","guid":{"rendered":"https:\/\/stevepedwards.today\/DebianAdmin\/?p=11170"},"modified":"2026-01-04T14:29:37","modified_gmt":"2026-01-04T19:29:37","slug":"11170-2","status":"publish","type":"post","link":"https:\/\/stevepedwards.today\/DebianAdmin\/11170-2\/","title":{"rendered":"How to remember RJ45 pin colours"},"content":{"rendered":"
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When viewing left to right pins 1-8, the pair legs \u2013 even if split colours, are legs AB AB AB AB AB
\nwhere B legs are SOLID colours.<\/p>\n

The blue pair legs on Pins 4+5 seem reversed (legs BA) because for voice, in an RJ11, the B legs (single colour \u2013 no white) are all on pins 1, 2 and 3 (when working for BT installing phone cables, I always remembered \u201cB legs 1,2,3\u201d), with the blue pair in the middle of the connector, so are on pins 3+4, which in an RJ45, the middle pins are pins 4+5, with the Blue pair B leg first (pin4 \u2013 blue: pin5 White\/Blue).<\/p>\n

You should not have to think about Power over Ethernet voltages on any cable pins because:
\n\u201cIn Power over Ethernet (PoE), the pins that supply voltage depend on the PoE Mode (also called Alternative) being used by your equipment. The IEEE 802.3af\/at standards require \"Powered Devices\" (like your IP camera or VOIP phone) to be able to handle both Mode A and Mode B automatically.\u201d<\/p>\n

The Blue and Brown pairs do not change between 568A and 568B positions.
\nThe 568A starts with the Green pair pins 1+2 as legs A+B so W\/Gr, Gr.
\nStart by drawing the connector pin:<\/p>\n

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This only leaves the Orange pair to add, and as the pins follow leg sequence ABABABAB, pin 3 must be W\/Or so pin 6 is Orange:<\/p>\n

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When viewing left to right pins 1-8, the pair legs \u2013 even if split colours, are legs AB AB AB AB AB where B legs are SOLID colours. The blue pair legs on Pins 4+5 seem reversed (legs BA) because for voice, in an RJ11, the B legs (single colour \u2013 no white) are all ...\u00a0 How to remember RJ45 pin colours<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-11170","post","type-post","status-publish","format-standard","hentry","category-post"],"a3_pvc":{"activated":true,"total_views":5,"today_views":0},"_links":{"self":[{"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/posts\/11170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/comments?post=11170"}],"version-history":[{"count":4,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/posts\/11170\/revisions"}],"predecessor-version":[{"id":11177,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/posts\/11170\/revisions\/11177"}],"wp:attachment":[{"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/media?parent=11170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/categories?post=11170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stevepedwards.today\/DebianAdmin\/wp-json\/wp\/v2\/tags?post=11170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}