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Another condition that will make the output card switch is when the card looses communication with the MMI
Card. This could happen when the card cannot login to the MMI, when the switch is not working properly, or
when the MMI card has been removed.
Digital Output Switch alarms
The table below lists the alarms displayed as a result of the switch:
Switched, reason: logout
The output module is logged out from the input card that hosts the
MMI
–
for this module, it also refers to internal link failure.
Switched, reason: No bitrate
This alarm refers to input stream failure having caused the switch
Switched, reason: operator
This alarm refers to the operator having performed a manual switch
There is a delay of 15 seconds before the alarm appears.
12.2.6
FM
R
ADIO
I
NTERNAL
R
EDUNDANCY
FM radio internal redundancy will be triggered with the following alarms/events:
•
No Data Input
•
No contact with MMI module
If
all
the services configured for the FM radio module stop receiving data, the “No Data Input” alarm will be raised
and the internal redundancy module will switch backplane.
Another condition that will make the FM radio module switch is when the card looses communication with the
MMI Card. This could happen when the card cannot login to the MMI, when the switch is not working properly, or
when the MMI card has been removed.
Alarms displayed as a result of the switch:
Switched, reason: operator
This alarm refers to the operator having performed a manual switch
Switched, reason: no contact
with MMI board
This alarm refers to loss of contact with the MMI board having caused
the switch
Switched, reason: no input data
This alarm refers to the loss of input data having caused the switch
There is a delay of 60 seconds before the alarm appears.
12.2.7
C
LONED
L
INK
S
TATE
M
ODE FOR
D
UAL
IP
INPUT
MMI
MODULE
When in this mode, if there is a data port Link down/No signal on Port A, i.e. failure in the network/switch to input
port A or loss of all the input services to that port, then the system will also force a Link down on Port B. With
this, a failure in the inputs to port A will cause a total failure in all the inputs to the main MMI module (A and B)
down. This is typically used in Internal Redundancy setups, where the output cards will switch to the backup MMI
and backup backplane due to loss of all services, and will be then fed from data ports A and B from backup MMI.
This can be configured from the Maintenance Center as follows: