The channelized OC-12/STM-4 variant of the ASAP MDAs has features and channelization options similar to the 4-port channelized OC-3/STM-1 ASAP MDA.
DS-3 TDM channels can be further channelized to DS-1/E-1 channel groups. An E-3 TDM channel cannot be channelized and can only be configured in clear channel operation.