The OSC CHPID type is available on newer mainframes running an OSA-Express2 card or an OSA-Express card with the Gigabit Ethernet feature. The OSC is a special channel type that eliminates the need for an external console controller. The end effect is that access to the HMC and to the z/OS system console is made easier. The OSC CHPID can also be used to connect TN3270 sessions (with some limitations).

Because the OSC mode is not a general usage mode of operation, no further discussion of it is undertaken here.