{"id":2042,"date":"2009-11-03T19:16:29","date_gmt":"2009-11-03T23:16:29","guid":{"rendered":"http:\/\/nuxx.net\/blog\/?p=2042"},"modified":"2009-11-03T19:16:29","modified_gmt":"2009-11-03T23:16:29","slug":"cascaded-usb-hubs","status":"publish","type":"post","link":"https:\/\/nuxx.net\/blog\/2009\/11\/03\/cascaded-usb-hubs\/","title":{"rendered":"Cascaded USB Hubs"},"content":{"rendered":"<p><center><\/p>\n<table cellpadding=1>\n<tr>\n<td bgcolor=\"black\"><a href=\"https:\/\/nuxx.net\/gallery\/v\/acquired_stuff\/IMG_4221.jpg.html?g2_imageViewsIndex=2\"><img decoding=\"async\" src=\"https:\/\/nuxx.net\/gallery\/d\/87443-2\/IMG_4221.jpg\" height=427 width=640 border=0 title=\"USB hub PCB UH-BSC1-GL10-090121 with two cascaded Genesys Logic GL852G 4-port hub chips found in UH-217C-US, purchased from Firefold for $22.99. The hub for the four ports on the right are cascaded off of the hub controlling the three on the left.\"><\/a><\/td>\n<\/tr>\n<\/table>\n<p><\/center><\/p>\n<p>As part of rewiring my office I purchased <a href=\"http:\/\/www.firefold.com\/7-Port-USB-20-Hub-Self-Powered-With-Power-Supply-P1089C44.aspx\">this seven-port USB hub from Firefold for $22.99, part number  \t USB-7P-HUBSP<\/a>. It turns out that this hub is actually two <a href=\"http:\/\/www.genesyslogic.com\/_en\/product_01_1.php?id=43\">Genesys Logic GL852G<\/a> hub chips, with one cascaded off of the other. The three ports shown above on the left are connected to the first hub, then the other four are connected to the second hub chip. Thus when the case is closed up (<a href=\"https:\/\/nuxx.net\/gallery\/v\/acquired_stuff\/IMG_4224.jpg.html\">as seen here<\/a>) ports 1-4 are on one hub which is connected to the hub that ports 5-7 are on. This shouldn&#8217;t cause a problem, but it&#8217;s a much cheaper design than using a seven port hub chip and having everything at the same level.<\/p>\n<p>The hub also ships with a 5V 2.5A switching power supply. Having seven ports which can supply a maximum of 500mA each, this power supply cannot fully power the hub. That said, most devices never pull anywhere near 500mA, so this shouldn&#8217;t be a problem either.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As part of rewiring my office I purchased this seven-port USB hub from Firefold for $22.99, part number USB-7P-HUBSP. It turns out that this hub&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/nuxx.net\/blog\/2009\/11\/03\/cascaded-usb-hubs\/\">Continue reading<span class=\"screen-reader-text\">Cascaded USB Hubs<\/span><\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,13,6],"tags":[],"class_list":["post-2042","post","type-post","status-publish","format-standard","hentry","category-acquired-things","category-computers","category-electronics","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/2042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/comments?post=2042"}],"version-history":[{"count":2,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/2042\/revisions"}],"predecessor-version":[{"id":2044,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/2042\/revisions\/2044"}],"wp:attachment":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/media?parent=2042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/categories?post=2042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/tags?post=2042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}