Guralp Systems CMG-DCM build <10,000 - Manual (Page 73)

Operator's Guide
If you are configuring a number of watchdogs, you can use the User
description field to give each of them memorable names.
The Enable check-box should normally be ticked but can be left clear
if you only want to use the associated PPP connection occasionally.
An existing watchdog service can be stopped and its configuration
deleted by selected the Delete check-box and then clicking the
“Submit” button.
If the PPP connection relies on a modem link for its transport, there
may be a significant delay between instructing the PPP link to start
and the connection being established. So that the watchdog does not
falsely detect a failed link during this period, it can be instructed to sit
idle for a number of seconds before it begins to test the link. The
length of the required delay should be entered into the Daemon
startup delay field.
Once the start-up delay time has elapsed, the watchdog periodically
tests the connection. To ensure that there is a valid end-to-end
connection where, for example, a multi-hop link is in use, the exact
method of testing is user-configurable: any valid command can be
entered into the Test command field and its exit status is taken to
represent the link status (zero for link up, non-zero for down). The
most common method used is to use the ping command to verify
ICMP connectivity to the ultimate remote host, but you are free to use
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