
{    The purpose of this routine is to determine if previously downed
{ RHFAM/VE components are now available for service.
{
{    To optimally utilize the LCN, each local RHFAM/VE keeps track of
{ failing hardware components.  This allows the access method to avoid
{ assigning outgoing connections on LCN paths that may not give the
{ user a quality level of service.  As network anomilies are encountered
{ by the PP drivers these anomilies are analyzed and any failing components
{ are flagged as down.
{
{    If a DOWNed element is a local NAD that is maintained by this host then
{ the auto-dump and reload processes are invoked.  These procedures will
{ place the element back in service if the reload was successful.
{
{    When a path has been disabled then this routine is in charge of
{ determining if that path is now available.  The mechanism used is
{ to enable the path for access after it has been out of service
{ for a threshold time.  There a three threshold times.  Each one is
{ based on the length of time that the path has been out of service.  The
{ constants defined below show the threshold classes and corresponding
{ times.
{
{    NOTE - the failure count is used to determine the class.
{           Once a connection has been successfully established
{           across the connection the count is cleared.
{
{    current_time: (input) This parameter specifies the current time
{      in microseconds, which is used to determine if a threshold
{      time has completed.
