3Com 3CBLSG48 User Guide - Page 193

182 CHAPTER 16: mANAGING DEVICE DIAGNOSTICS The Cable Diagnostics Summary Page contains the following fields: Ports - Specifies the port to which the cable is connected. Test Result - Displays the cable test results. Possible values are: Open - Indicates a cable is not connected, or the cable is connected on only one side, or the cable is shorter than 1 meter. Short - Indicates that a short has occurred in the cable. OK - Indicates that the cable passed the test. Cable Fault Distance - Indicates the distance from the port where the cable error occurred, in meters. Last Update - Indicates the last time the port was tested. Configuring Cable Diagnostics The Diagnostics Page contains fields for performing tests on copper cables. Cable testing provides information about where errors occurred in the cable, the last time a cable test was performed, and the type of cable error, which occurred. The tests use Time Domain Reflectometry (TDR) technology to test the quality and characteristics of a copper cable attached to a port. When performing cable tests consider the following: During the tests, ports are in the down state. The minimum cable length resolution is one meter, so if the cable is shorter than 1 meter the test will display "no cable". An open cable or a 2-pair copper cable will display a cable fault distance of 0. The maximum cable length is 120 meters.