NEC SP5008A - Manual (Page 40)

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The default setting is “Disable”, if you are not
using this particular special application
mentioned above, please do not enable this
function.
ping ip to keep alive network Specify the IP for pinging to make sure the
network keeps alive.
ping timer(sec) Specify the interval of ping timer(sec)
1. Press the “Apply” button (at the bottom) after you finish to save changes.
2. Press the “Reboot” button to apply the changes.