The number of connections sampled to determine
whether a modem should be taken out of service. If a
modem fails more times in this sampling period than
allowed, then it is taken out of service. For example,
if this number is set to 16, and the fail count is set
to 8, then a modem that fails more than 8 out of its
last 16 connection attempts will be taken out of
service. 0 indicates that the modem will never be
taken out of service for this reason.