System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
2 Mbit/s card protection switching
Aastra Proprietary Information Page 2-77
2.7.2 2 Mbit/s card protection switching
In a card protection switching configuration, two port modules are used for
protection switching. In this case, an interface (priority) located on one port
is protected by a standby interface located on a second port. For both ports,
the same subaddress has to be used for both the preferred interface and
standby interface.
Up to 16 port interfaces can be doubled in a node.
Criteria for switchover to the protection path are
•AIS
•LOS
•LOF
• BER
-3
.
If one of the above criteria is detected in the preferred path, switchover to
the protection path takes place. A network management system is not
required for switchover. The automatic switchback function from the
standby path to the preferred path can be configured.
When entering the routing data, please ensure that time slot 0 of the 2 Mbit/s
signal is transmitted transparently between the terminal stations.
Figure 2.34: Card protection switching
XMP1
1
2
3
4
1
2
1
2
Port
2 Mbit/s
opt.
Code-transparent
transmission
Code-transparent
transmission
Port
2 Mbit/s
el.
Port
2 Mbit/s
opt.
1
2
3
4
Port
2 Mbit/s
el.


XMP1