To find out which fibre cabinet you are connected to you can use the FTTC checker. for example WS-X6724-SFP Is there no command to check fiber link?? Thank you 04-01-2009 10:48 PM It's got. Cable identification stands as a critical practice in fiber optic networks. Misidentification can cause downtime, disrupt essential services, and create safety hazards in data centers. It usually begins with the letter A or B (or in rare cases with an O or WP), followed by a ten-digit number. This is how it. Per TIA/EIA standards, the following color coding applies for non-military fiber optic installations: Multimode OM1 = Orange or Slate (Watch for this! OM1 is not compatible with connectors for OM2/OM3/OM4) However: Per TIA 598-C, it is permissible to use different jacket colors as long as the cable.