Duplication (Aastra Xd) - Aastra AXD Installation And Maintenance Manual

information.
The cards located in an expansion cabinet communicate with the UCV card or the active
UCV-D card of the main cabinet through the RUCV card or RUCV-D card.
The RUCV/RUCV-D cards are installed instead of the UCV/UCV-D cards in the expansion
cabinet. Their main function is to distribute the line equipment bus and synchronous
junctions to the expansion card slots.
3.8.3

Duplication (Aastra XD)

Duplication of CPU cards
• Duplication of UCV-D cards: two UCV-D CPU cards (duplex configuration) can be
fitted in the Aastra XD main cabinet. A single card is enough to run the entire system.
In a duplex configuration, one UCV-D card is active and the other passive. Interfaces
with the system bus and the equipment bus of both UCV-D cards are connected
together to the back plane. Only the interface of the active card is validated. Using the
duplex logic, the system determines which of the two UCV-D cards is active and
ensures that only one of the two cards can be active at a given moment.
After a switchover the duration of which depends on the configuration (15 s. to 1 min.),
the passive CPU card takes over and becomes active in the following three cases :
• If the active card is removed
• If the active card remains idle for 2 minutes
• If a hardware failure is detected on the active UCV-D card (in this case, a
Nota : Since an anomaly causes software reset, it cannot trigger a switchover to the
passive card. The active card restarts.
A switchover can be triggered by MMC (upon the installer's request), with a view to
performing duplex function related tests.
• Duplication of RUCV-D cards: in an expansion cabinet, the equipment buses and
synchronous buses of the two RUCV-D cards are connected together to the back
plane, the RUCV-D card connected to the active UCV-D card takes control of the
buses.
A hardware fault detected on the RUCV-D card connected to the active UCV-D card
triggers a switchover of the UCV-D card. The passive UCV-D card then takes over. Of
course, this system performs this switchover only if it does not encounter serious
anomalies on the second UCV-D card.
After a switchover the duration of which depends on the configuration (15 s. to 1 min.),
the passive CPU card takes over and becomes active in the following three cases :
• If the active card is removed
• If the active card remains idle for 2 minutes
• If a hardware failure is detected on the active UCV-D card (in this case, a
Installation and Maintenance Manual - Aastra 5000
Description et caractéristiques d'un PBX
hardware fault detection is performed. The unavailability time on the cabinet
can, therefore, be up to 3 minutes. ).
AMT/PTD/PBX/0058/4/6/EN
01/2011 Page 97