Specifies the subarea number of the host to which this PCCU definition statement applies. suba_num is a decimal integer in the range 1–65535.
The subarea value should match the value assigned to the HOSTSA start option when VTAM® is started. VTAM uses the subarea value to determine which PCCU definition statement it should process in the NCP major node. See z/OS Communications Server: SNA Network Implementation Guide for a discussion about how VTAM selects a particular PCCU definition statement.