continuation of message (ATM) (CoM)
With the Continuation of Message(CoM), a data field in a protocol data unit( PDU) of the AAL 3/4, the ATM adaptation layer, an identification is performed with respect to a PDU. The occupancy of the segment type identification field from the ATM Adaption Layer (AAL) type 3/4 of the SAR PDU indicates that a center part of a SAR PDU is located in the corresponding SAR PDU.