All records contain the following sections:
This section is present in all standard SMF records. NTS SMF records are recognizable by SMFNMRTY=X'27'(SMF Type 39). Following the standard header is the Type 39 extension providing the product identifier and record sub-type field SMFNSUBT.
This section is present in all NTS SMF records and provides a map giving the number and offsets for all other SMF data sections contained in the record.
One product section is always present. This section includes the product identifier (NETM), the product version information, and the record sub-type field. This sub-type field, SMFNPSUB, is set to the same value as SMFNSUBT (above) except where SMFNSUBT=X'FF' (Sub-type 255). Sub-type 255 records are NTS defined, and are further sub-divided by the SMFNPSUB field.