M320 Fuses

The router uses fuses from the Cooper Bussman brand GMT series for the CB, SIBs, and FPCs. The fuses are located in the rear of the midplane behind the power supply in slot PEM0. When the fuse for a component blows, the component stops functioning even though it is installed correctly and the power supplies are providing power to the router. For more information, see Troubleshooting the M320 Fuses. For fuse replacement instructions, see Replacing an M320 Fuse.