The RDCO-03 module includes the connectors for fiber optic DDCS channels CH0, CH1, CH2 and CH3. The usage of these channels is determined by the application but are normally assigned to the following: CH0 overriding system (e.g. fieldbus adapter) - 5 MBd. CH1 I/O extensions - 5MBd. CH2 Master/Follower link - 5 MBd. CH3 PC tools (such as DriveWare) - 5 MBd.