That's actually the point of the Dying Gasp feature in OAM.  It tells you as the device is dying.  Hence dying gasp.  If the device detects that the PSU(s) have lost input power, it can send a syslog, SNMP trap, or EOAM message before the device's control-plane fails, alerting an NMS or in the case of EOAM or OAM, the upstream device. ... View more

I think this is a rather critical feature, especially for MSPs.  With some form of OAM Dying Gasp coupled with the TDR test from the MSs, I can tell if a customer unplugged a MR from my MS or if it lost power (AC adapter).  I can tell if my a MS in a remote closet lost power or if someone unplugged/cut the uplink cable.  I can tell if my MX lost power or if the upstream is down again.  Dying Gasp is the difference between an unnecessary truck roll or answering a phone call from the customer with knowledge in-hand that a given device lost power, not failed. ... View more