Guralp Systems CMG-DCM build <10,000 - Manual (Page 74)

CMG-EAM (Platinum Firmware)
the command or script of your choice here, so long as it returns a non-
zero exit status on link failure.
The contents of the Time between tests field determines how often the
configured test is applied. It can be set high to conserve bandwidth or
set low to improve failure response times. It can also be used to keep a
sparsely-used link alive where a “disconnect-on-inactivity” feature
would otherwise interrupt it.
If the link test fails repeatedly, the CMG-EAM is rebooted. The
number of failed tests before this happens is controlled by the “Reboot
fail count” field.
The ppp watchdog service can be started, stopped and restarted using
the “Services” page under the “Control” menu. See section 13.2.4 on
page 181.
6.7 Configuring TCP to serial converters
The CMG-EAM can act as a TCP to serial converter, effectively
transporting data between one (or more) of its serial ports and a TCP
connection. There are two different modes of operation, as detailed
below. Any number of serial ports can be configured as TCP
converters, as long as the TCP port numbers do not clash.
74 Issue C
Note: When using ping, you should always use the ­c count
option or the command will never return.