Ensure that the CPE at the subscriber site is powered up. Perform a continuity check to ensure that the cabling to the CPE is connected and intact. If the CPE is disconnected or turned off, or if there's a break in the local loop, expect to see a CO receiverGain value over 10 db, and values of 0 db for both CPE transmitPower and CPE receiverGain. Card cannot be fully inserted into its slot. Inspect connectors on both the card and the backplane, looking for bent pins or other damage.
Card experiences problems in one slot but operates normally in another.
There may be a fault in your backplane. Fans do not run. Make sure the fan tray is fully inserted into the chassis. Check input power connections. If connections are loose or their polarity is reversed, chassis does not receive power and fans do not run.