This Integer32 (1 to 65535) sets the maximum AAL5 CPCS SDU size in octets supported in the transmit direction of this VCC, applicable only when the local VCL endpoint is also the VCC endpoint and AAL5 is in use, with the description noting a current maximum of 1744 is supported. An admin sets it to match the largest frame size the far end can accept in this direction, avoiding fragmentation or rejected oversized SDUs. For example, an admin needing to carry Ethernet-sized frames over AAL5 would set csAtmConnAal5CpcsTransmitSduSize up to the supported 1744-byte ceiling rather than assuming the default is sufficient.