SilentKnight VisorAlarm Plus 2U - Manual (Page 34)

VISOR ALARM – Configuration
III - 32
Doc.DM374-I
Ver.1.0
PRIMARY ARLY-1 Cfg> backup-alarm-receiver option value
The available options are as follows:
•
type: Defines the type of VisorALARM PLUS 2U. This can be main, secondary (backup) or
maintenance. The mIP/IPDACT will always try and send alarms to the VisorALARM PLUS
2U configured as main. If the alarms do not reach this device, the mIP/IPDACT will send
them to the backup device. Anyway, alarms are also sent to the maintenance receiver if it is
configured. Once the type of VisorALARM PLUS 2U has been defined, the S LED will light
up in green on the main and maintenance, and in yellow on the backup.
•
address-main: This is the main VisorALARM PLUS 2U public address. This parameter is
only used in the backup VisorALARM PLUS 2U.
•
sync-port: This is the TCP port that listens in the main VisorALARM PLUS 2U to which the
backup VisorALARM PLUS 2U connects each time the configurations need to be
synchronized. Synchronizations are always produced each time either of the two
VisorALARM PLUS 2U starts up and periodically once both are operating.
•
poll-time: This is the time where the backup VisorALARM PLUS 2U periodically polls the
main device to check its status.
•
poll-failure-time: This is the time period within which the backup VisorALARM PLUS 2U
considers that responses to the polls should have arrived. If during this period a response has
not arrived, then a problem has possibly occurred, either in the communication or in the main
VisorALARM PLUS 2U. The backup device will then begin a process of retries until the
main device is considered down. The backup subsequently activates. In cases where the main
device is considered down the backup device will signal the 399 event code (Primary
VisorALARM down).
•
retries-number: This is the number of necessary polling retries in order to consider that the
main device is down.
•
retry-time: Time between retries.
•
polling-sync-time: Time between configuration synchronizations. This value is fixed to 30
seconds for the main receiver. For the secondary receiver this value can be programmed to a
different value. Modifications in the configuration of either of the two devices, main and
backup, are saved with a time mark associated. When the timer reaches the programmed time,
a check is carried out to see if it is necessary to execute synchronization and if necessary this
is executed.
The right election of the previous values is fundamental for the correct operation of the
backup process. Specifically, these parameters affect the detection of service
interruption for both the main and the backup receivers.
However, a receiver could decide that its complementary receiver (main or backup) has
a failure as the polling between them has been interrupted, however that polling could
have failed because the receiver itself doesn’t have the Ethernet up or because it
doesn’t have Internet access.
So, it is very important that detection of poll failure is slower than detection of failure
in the Ethernet interface or the Internet.
As guide to choose an adequate set of parameters it is strongly recommended that the
values meet the following conditions:
Main VisorALARM PLUS 2U receiver:
2 x POLL-TIME > 15 1