RP/0/RP0/CPU0:N540# config terminal
Sat May  4 19:37:35.241 UTC
RP/0/RP0/CPU0:N540(config)#controller optics 0/0/1/0
RP/0/RP0/CPU0:N540(config-Optics)#no breakout 4x10
RP/0/RP0/CPU0:N540(config-Optics)#commit 
Sat May  4 19:38:12.874 UTC