Xenon Software Architecture
This section describes the basic software architecture in the Xenon Switching System. The software has been partitioned into the software modules shown below.
|Path Switching and Routing||
Basic voice path switching and call routing framework is implemented by this layer. V5.2 and ISUP Call Processing use the services provided by this module. This module also interfaces with the operator interface software for definition of routing tables and path resources.
This software module resides on XEN (tone switching, time switching) and CAS (space switching and call routing).
|V5.2 Call Processing||
This software module handles complete V5.2 call processing and interface management. It also interfaces with the System Maintenance module for digital trunk fault handling. This module gets the subscriber database information from the operator interface module.
This module resides mainly on the XEN card.
|ISUP Call Processing||
This software module interacts with other switches to establish the SS7 protocol. ISUP call state machine is implemented by this layer.SS7 link and linkset definitions are obtained from the Operator Interface module.
ISUP processing is carried out mostly on the XEN processor.
System Maintenance software is responsible for maintaining the health of the system. This module detects and recovers from hardware and software failures. Hardware diagnostics are also run to pin-point the exact fault. Operator Interface module provides a front end for all the maintenance related actions.
System Maintenance software is controlled mainly from the CAS card. XEN switchover logic and fault detection logic is implemented on the XEN card. Digital trunk fault handling is also implemented on the XEN.
This software module maintains the configuration database of the system. It manages operator commands, alarms and events. Almost all software modules use the services of this module to interact with the operator.
This functionality is controlled from the OMC. Database and configuration change interfaces are implemented on the CAS and XEN cards.