User guide

VMS Network Configuration
3-10 VMS User Guide
is how long the VMS will wait before determining communications failure
commanding a device redundancy switchover. The Debounce is a message
count on how long the VMS will receive messages sent from the modem
with alarm information set. This value is important to reduce the possible
spurious alarm redundancy triggers.
12. The Communications timer values set timeouts for command messages.
The Retry Timeout is the wait between messages which works in conjunc-
tion with Retry Count. The default setting with a count of 3 and a timeout of
5 seconds would set the message failure at a total timeout of 15 seconds with
3 attempts to command the modem.
If communication latencies are greater than default settings (command
communication failures), increase the Retry Timeout value.
13. The Announcement Period is a the interval at which VMS will multicast
its management IP address to all listening modems within the network. This
ensures, for example, that remotes that are not online during a redundancy
switch will pick up the new managing address when they come back online.
The default value (15 sec) enables the VMS to send the update message on a
15 second interval to establish the current managing address in all modems
set to receive the message.
14. The Failure Threshold parameter specifies the number of consecutive
attempts that the VMS will make for a single remote unit to switch using an
available demodulator before that demodulator is made unavailable.
15. Select the Registration tab shown in figure 3-9 and click the Add button to
add the Network ID number (any number between 1 – 255) that will iden-
tify this network. This number must match the Network ID established in the
modems for this network.