Library /sys$common/syshlp/helplib.hlb
PPPD, SHOW, Qualifiers, /ECHO
 *Conan The Librarian 

       /ECHO=(FAILURE=value, INTERVAL=value)

    Specifies the number of Link Control Protocol (LCP) echo requests
    and the interval (in milliseconds) between requests that must be
    sent without response before the line is considered down.
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