This section contains the common SMF record headers fields and the triplet fields (offset/length/number), if applicable, that locate the other sections on the record.
| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | 0 | TTI31LEN | 2 | binary | Record length. This field and the next field (total of four bytes) form the RDW (record descriptor word). See Standard SMF record header for a detailed description. |
| 2 | 2 | TTI31SEG | 2 | binary | Segment descriptor (see record length field). |
| 4 | 4 | TTIRFLG | 1 | binary | System indicator:
*See Standard SMF record header for a detailed description. |
| 5 | 5 | TTIRCDTY | 1 | binary | Record type 31 (X'1F'). |
| 6 | 6 | TTIRCDTS | 4 | binary | Time since midnight, in hundredths of a second, that the record was moved into the SMF buffer. |
| 10 | A | TTIRCDTE | 4 | packed | Date when the record was moved into the SMF buffer, in the form 0cyydddF. See Standard SMF record header for a detailed description. |
| 14 | E | TTICPUID | 4 | EBCDIC | System identification (from the SID parameter). |
| 18 | 12 | TTINBF | 2 | binary | Number of time-sharing buffers. |
| 20 | 14 | TTIBUFSE | 2 | binary | Time-sharing buffer size, in bytes. |
| 22 | 16 | TTIRSVRD | 2 | Reserved. | |
| 24 | 18 | TTIOMAX | 2 | binary | Maximum number of output buffers allowed per terminal before OWAIT. |
| 26 | 1A | TTIIMAX | 2 | binary | Maximum number of input buffers allowed per terminal before LWAIT. |
| 28 | 1C | TTIOWTH | 2 | binary | OWAIT threshold. The number of buffers that must be freed in order to be freed from OWAIT. |
| 30 | 1E | TTIRSTH | 2 | binary | RESTART threshold. The number of buffers that must be freed in order to be freed from LWAIT. |
| 32 | 20 | TTIUSLW | 2 | binary | Number of buffers reserved on the free queue (less than this number results in a system-wide LWAIT). |
| 34 | 22 | TTIUSSL | 2 | Reserved. | |
| 36 | 24 | TTITSBS | 1 | binary | Size of one terminal status block (TSB). |
| 37 | 25 | TTIUSCH | 21 | Reserved. | |