Verilink IDCSU -- LOS Lead --
If desired the IDCSU may be configured to monitor either one of two leads
(RTS or DTR) which typically are asserted by the DTE. When this lead is not asserted
an alarm is then reported. In this way the IDCSU can be relied upon to report if one of
these conditions occurs:
DTE is powered down
DTE cable is disconnected
DTE goes offline
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