ZCOM Tables and Data Structures
Physical Terminal Tables
Physical Terminal Tables
The physical terminal table (zptt_type) contains information used by the LDM and DAM to initialize and control a physical terminal (or other device). The PTT consists of a system area, which is reserved for use by the ZCOM subsystem, and a user area which may be manipulated by application programs. The user modifiable portion of the PTT immediately follows the reserved area. The layout of the PTT is shown in Table
Table | Physical Terminal Tables (System Area) |
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Field Name |
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PTZLU |
| Owning terminal ZLU number | uns.short | 2 |
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PTZCS |
| Owning terminal ZLU checksum | uns.short | 2 |
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PTMUX |
| MUX number for this terminal | uns.short | 2 |
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PTPORT |
| Port number within interface | uns.char | 1 |
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PTTERM |
| Terminal number within port | uns.char | 1 |
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PTMX_TERM |
| Terminal number in card | uns.short | 2 |
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SUBCH |
| Subchannel number on port | uns.short | 2 |
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PTZPRCVR |
| ZCOM address of primary receiver | struct | 6 |
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PTZPCTL_RCVR |
| ZCOM address of primary control receiver | struct | 6 |
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PTZSHRCVRS |
| Pointer to list of shared receivers | pointer | 8 |
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PTZSHCTLRCVRS |
| Pointer to list of shared control receivers | pointer | 8 |
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PTLIST |
| Pointer to next PTT of same port | pointer | 8 |
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PTTXLX |
| Pointer to next PTT on express list | pointer | 8 |
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PTTXQX |
| Express transmit buffer queue | struct | 56 |
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PTTXLA |
| Pointer to next PTT on high priority list | pointer | 8 |
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PTTXQA |
| High priority transmit buffer queue | struct | 56 |
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PTTXLB |
| Pointer to next PTT on low priority list | pointer | 8 |
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PTTXQB |
| Low priority transmit buffer queue | struct | 56 |
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PTTXQC |
| Unacknowledged transmit buffer queue | struct | 56 |
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PENDG_TXREQ |
| Next request for $DATA | struct | 56 |
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PTPZLK |
| ZLU of next PTT on this port | uns.short | 2 |
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66 | Chapter 3 |