Features
| • | Multi-tasking executive |
| • | Preemptive scheduling |
| • | Modular software design |
| • | Multiple timer facility |
| • | HPC physical layer I/O interface |
| • | Layer 2 link access procedure for the D channel (LAPD) |
| • | Layer 2 link access procedure for the B channel (LAPB) |
| • | Layer 3 protocol control procedure for a terminal endpoint |
| • | Layer management entity support |
| • | Demonstration Call Control Task |
| • | Task[horbar]View task exerciser and debugger |
| • | Message trace capability |
| • | Split frame message formatting |
| • | Source code in C language |
Description The ISDN Basic Rate Interface Software Package implemented on the National Semiconductor HPC™ Microcontroller Family contains the software elements that are necessary to implement CCITT standards Q.921 and Q.931 as approved by ANSI committees for North America.
The software package is designed to be easily unbundled and used independently by a software developer. Each layer or function is written as a separate software task. This modular design and well defined task interface make it easy to interface application dependent software to the modules provided. The coding standards for software development have been designed to ensure development of consistent, structured code, which can be easily used and maintained over the life of the code.
This software is supplied as a disk set and is used in conjunction with HPC development tools and software.
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