NCPBUFSZ start option

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   .-NCPBUFSZ--=--512------.   
>>-+-----------------------+-----------------------------------><
   '-NCPBUFSZ--=--+-512--+-'   
                  +-1024-+     
                  '-2048-'     

Specifies the request unit size in bytes (I/O buffer size minus the size of the SNA header) used by VTAM® when loading or performing a static dump of a remote NCP.
Note:
  1. This value does not apply to a MODIFY LOAD command. The length of the IPLTEXT RU is always 2048 plus the length of the SNA header.
  2. This value applies only to static dumps or loads of 3720, 3725, and 3745 communication controllers. VTAM ignores this value when loading or dumping a 3705, and uses a data size of 512 bytes.