| Field | Type | Description |
|---|---|---|
| hdreptr–>elteptr–>elteptr | PTRBFELT | Pointer to next buffer element: NULL |
| hdreptr–>elteptr–>startd | INTEGER | Index to start of data in this buffer element's data array: 1 |
| hdreptr–>elteptr–>endd | INTEGER | Index to last byte of data in this buffer element's data array |
| hdreptr–>elteptr–>dataru | CHAR[SNANBEDA] | Defined as follows, where s = startd–1 |
| dataru[s] | Length of facilities data field (= c) inclusive of this length byte 0x01 no facilities data |
|
| dataru[s+1..s+c–1] | CHAR[c–1] Facilities data | |
| dataru[s+c] | CHAR Length of user data field (= d) inclusive of this length byte 0x01 no user data |
|
| dataru[s+c+1..s+c+d] | User data | |