Instruction manual

FUNCTIONAL DESCRIPTION
● Operating System (OS)
Controls all message and data flow to/from memory, to the Arch Angel Driver
Interface, to the microprocessors on the port circuit packs, and to the RS-232 driver
interfaces. Messages destined for a particular task are queued until the associated
task can receive them. When a task has completed a particular process, the next
message is obtained from the message queue of the tasks. The OS provides an
interval timer that is used to time tasks.
Processes that exceed the set interval
(about 60 seconds) are terminated by the OS.
● Arch Angel Driver Interface
Provides an interface between the OS and Network Control.
● RS-232 Driver Interface
Handles the flow of information between the CPU/MEM CP and the peripheral
equipment of the system (i.e., System Administration Terminal or Advanced
Administration PC, Digital Tape Unit, and SMDR Output Device.)
TDM Bus
Provides an electronic link between the system port circuits (including System Resources)
and between the CPU/MEM and port circuits.
Port Circuit Packs
Each port circuit pack has on-board software that provides for the sending/receiving of
Network Control messages and data.
Circuit pack status messages are also sent to the
Network Control software.
Step-By-Step Call Description
The following is a description of a call originated between two multiline voice terminals.
1. A microprocessor on a station port circuit pack (port controller) continually monitors
associated port circuits for switchhook status/change and button presses.
2. When a user goes off-hook, the port controller detects the change.
3. The port controller sends an off-hook up-link message along with port identification
to the Call Processor Network Controller (CPNC) via the TDM bus.
4. The CPNC accepts the message and forwards it to the Operating System (OS) via
the Arch Angel Driver Interface.
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