NEC Univerge SV9100, Manual

Page: 632 / 766

Issue 2.0
SV9100 Networking Manual 13-37
Keep Alive Operation
3.19 Keep Alive Operation
The Keep Alive operation will check that the distant end is available. A dummy message is sent that the
distant end must respond to, if no response is received the line will be taken out of service.
Keep alive operation is effective on ISDN BRI/PRI and IP AspireNet connections.
Operation
The response to the keep alive message is automatic.
The generation of the keep alive message is set by Program 10-31-01, when the timer is set. If the timer is
set to 0 the keep alive generation is turned off.
The retry count for a keep alive message that is not responded to is also set at the originating system.
The line will be placed back in service when the line is active and a keep alive message is responded to a
keep alive message.
The keep alive operation will only take place if the message is sent and not responded to by the distant
end, if the message is not sent (for example if ISDN layer 1 is not active) then the keep alive operation will
not take place.
When the keep alive operation occurs the link will be taken out of service:
• Any calls that are in progress will be released.
• Park Hold orbits will be released.
• No further Park Hold information will be sent until the link is active.
Related Programs
Program Number Title
10-31-01
The interval of the keep alive time. The interval can be set from 0 to 65535
Seconds. When set to 0 the keep alive is disabled.
10-31-02
Retry Count. The system will retry the keep alive message, after the distant
end does not respond after this count the line will be taken out of service.