Software
The System software consists of switched services, administrative, and maintenance software. This software runs on top of the
Switched Services Software
The switched services software provides voice and data call processing. This software resides in the Call Processor and Memory Circuit Packs (that are collectively referred to as the Common Control circuitry), and in the
The switched services software uses the operating system to provide a process based, message passing, execution environment. The operating system scheduler provides scheduling for the software according to process priority.
Administrative Software
The administrative software provides the control for system rearrangement and change via the System Administration Terminal (SAT). This software resides in the Memory Circuit Pack and does the following functions:
● Organizes | the translation | data for | administrable | entities in the system in a form |
that can | be viewed and | changed at | the System | Administration Terminal. |
●Tests entered data for consistency with data previously entered in order to avoid
such errors as the assignment of the same extension number to two voice terminals. An erroneous or inconsistent data entry is disallowed and an error message is provided.
●Causes the translation data to be downloaded, on command, to an optional Digital Tape Unit (DTU).
Maintenance Software
The maintenance software provides automatic periodic testing of maintenance objects within the system as well as consistency tests among the call status tables within the system. In addition, demand testing is initiated when the system detects a condition requiring a need for testing. Software tables are provided for storing error records. The records can be accessed by maintenance personnel via the SAT. A Permanent System Alarm (a serious error) causes an alarm indicator on the attendant console to light and an error record to be stored in the error table.
Memory Allocation
The system software, like the hardware, is identified by release and version number. Each version identifies a particular memory configuration for the release number. Main memory is located in the Common Control circuitry. The operating system and error log software resides on the Call Processor circuit pack and the remaining administration and call processing software is on the Memory circuit pack.
