User manual

MX-ONE SYSTEM DESCRIPTION
90 21/1551-ASP 113 01 Uen N2 2014-01-28
A distributed system solution implies that if a server fails, no traffic
except traffic through this server will be disturbed. To avoid distur-
bances, no data lock up in other server should occur due to the faulty
server.
If a software connection between two servers is released only at one
end, data areas will remain locked as long as the linkage to the area is
lost. This can lead to a congestion situation. To handle this lock up
problem, each application program creating a mutual connection with
data areas in other program units are instructed periodically to check the
validity of assumed connections.
The check is administrated by the service system and is spread in time
to avoid congestion.
Program Configuration
The purpose of the program configuration supervision function is to
check that a common function unit only exists in two servers in the
system.
Any conflict in the configuration causes an alarm.
System Backup
The purpose of the system backup supervision function is to check that
a valid system backup is always accessible.
6.4.7.2 Supervisory Functions on Media Gateway Level
Test of Hardware before Loading
The purpose of the test of hardware before loading function is to validate
that the hardware is functional.
All tests are done by the running operating system and BIOS functions.
LIM Switch Supervision
The LIM switch supervision function has the following purposes:
• Periodical testing of the switch board circuits using a supervision
signal to LSU-E. The circuits are tested by internal firmware on the
boards.
• Supervise connection setups
• Analyze device board supervision results
The LIM switch supervision is only applicable for a Media Gateway
Classic configuration.
For more information about the LIM Switch, see section LSU-E.