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TELEPHONY SERVER SOFTWARE
Supervision of Voltage
The purpose of the supervision of voltage function is to check the voltage
of +5 V, -5 V, +12 V, -12 V, -48 V.
When a fault occurs, an alarm is raised containing information about the
relevant voltage and the location of the missing voltage.
This function is only applicable for a Media Gateway Classic configuration.
Device Boards
The purpose of the device board supervision function is to test the device
boards’ communication abilities by sending a periodical test signal to the
device processor. An immediate answer is expected.
The answer signal contains the identity and the number of individuals of
the device board. The data is compared with the current board table to
find any conflict in the device board configuration, that is, a newly
inserted board can hide the signaling from a previous board, which will
result in that the previous board is out of order.
This function is applicable for a Media Gateway Classic and MX-ONE
Lite configurations.
Program Execution
The purpose of the program execution supervision function is to supervise the following:
•
Execution times of a program unit
If a program unit is looping more than the allowed time due to
programming faults or incorrect data, it will be interrupted and the
job discarded.
•
Address control
Situations can arise when the linkage between data areas has
become faulty. To protect data areas from being accessed by other,
unauthorized applications, an address control value is added to the
pointer pointing out the data area. The address control value is a
random value unique for the current linkage. The value is only valid
as long as both areas agree in the linkage.
•
Signal routing control
All signals exchanged between and within program units are
checked in the following way before they are allowed to start execution in a program unit:
–
–
Receiving server number corresponds to the server number
address in the signal
Addressed program unit exists
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