{"id":1333,"date":"2020-06-05T19:14:09","date_gmt":"2020-06-05T19:14:09","guid":{"rendered":"http:\/\/eltonoverip.com\/blog\/?p=1333"},"modified":"2020-10-22T17:50:07","modified_gmt":"2020-10-22T17:50:07","slug":"cisco-44xx-isr-show-light-levels","status":"publish","type":"post","link":"https:\/\/eltonoverip.com\/blog\/2020\/06\/cisco-44xx-isr-show-light-levels\/","title":{"rendered":"Cisco 44XX ISR Show Light Levels"},"content":{"rendered":"<p>If the command <code>show interface [INTERFACE] transceiver status<\/code> is not available, try using <code>show hw-module subslot 0\/0 transceiver [SFP SLOT] status<\/code>. Here&#8217;s an example.<\/p>\n<pre><code>\r\nCisco4451#show hw-module subslot 0\/0 transceiver 3 status\r\nThe Transceiver in slot 0 subslot 0 port 3 is enabled.\r\n  Module temperature                        = +24.316 C\r\n  Transceiver Tx supply voltage             = 3357.2 mVolts\r\n  Transceiver Tx bias current               = 13182 uAmps\r\n  Transceiver Tx power                      = -7.1 dBm\r\n  Transceiver Rx optical power              = -32.2 dBm\r\nCisco4451#\r\n<\/code><\/pre>\n<p>If it is still not working for you, check the output of <code>show logging<\/code>. Verify if the SFP that you are using is compatible with your equipment. It should not say <code>%TRANSCEIVER-3-NOT_SUPPORTED<\/code><br \/>\nExample:<\/p>\n<pre><code>\r\n000046: *Jun  5 2020 09:59:28.694 CDT: %TRANSCEIVER-6-INSERTED:iomd:  transceiver module inserted in Gigabitethernet0\/0\/3\r\n<\/code><\/pre>\n<p>The output of <code>show interface [INTERFACE]<\/code> should not say <code>media type is unknown media type<\/code>. It should state the media-type if detected and compatible. In the example above, I am using GLC-LH-SMD= 1000BASE-LX\/LH SFP transceiver module, MMF\/SMF, 1310nm, DOM<\/p>\n<p>The Transceiver Rx optical power should be between -3 to -8 dBm if interfacing within the same building or short-range optics.\u00a0 Long range optics can go a lot lower depending on distance.\u00a0 Anything less than -30 dBm is essentially no light received.\u00a0 The sample above shows no light.<\/p>\n<p>Check them here: https:\/\/www.cisco.com\/c\/en\/us\/products\/routers\/4000-series-integrated-services-routers-isr\/relevant-interfaces-and-modules.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If the command show interface [INTERFACE] transceiver status is not available, try using show hw-module subslot 0\/0 transceiver [SFP SLOT] status. Here&#8217;s an example. Cisco4451#show hw-module subslot 0\/0 transceiver 3 status The Transceiver in slot 0 subslot 0 port 3 is enabled. Module temperature = +24.316 C Transceiver Tx supply voltage = 3357.2 mVolts Transceiver [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1333","post","type-post","status-publish","format-standard","hentry","category-cisco"],"_links":{"self":[{"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/posts\/1333","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/comments?post=1333"}],"version-history":[{"count":7,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/posts\/1333\/revisions"}],"predecessor-version":[{"id":1360,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/posts\/1333\/revisions\/1360"}],"wp:attachment":[{"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/media?parent=1333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/categories?post=1333"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eltonoverip.com\/blog\/wp-json\/wp\/v2\/tags?post=1333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}