Entity and instance IDs

Each application must have a unique entity and instance ID for routing messages among the processes in the system. Entity IDs are single byte values in the range of 0x00 - 0xFF, assigned by the application developer. Entity IDs are allocated as follows:

Range

Usage

0x00 - 0x1F
0x80 - 0xFF

Reserved for use by system utilities, configuration utilities, and management utilities.

0x20 - 0x7F

Available for use by applications.


Instance IDs identify the processor on which the entity executes. The host is always processor 0 (zero). Therefore, all host-resident ISUP applications must be coded to 0 (zero). All tasks on TX board number 1 receive an instance ID of 1. All tasks on TX board number 2 receive an instance ID of 2, and so on.