36 — APC UPS cable assembly with beeper unit data sheet
36-4 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
Table 36-4 Alarm descriptions
36.6 Interface details
The PowerShield status signals are isolated from its internal circuitry using
opto-couplers; see Figure 36-3. The connection labeled SIGNAL RETURN is a
common return point for all status signals.
Figure 36-3 Schematic for typical PowerShield alarm signal
In the typical application, the digital ground on attached equipment attaches to the
signal return, and pull-up resistors are used to turn the open collector signals into
TTL levels.
The 10 Ω resistor and capacitor on each output signal provide ESD protection.
Signal name Description
On-Battery Alarm indicates that the load is receiving power from battery.
Replace Battery Alarm indicates that the battery has failed its periodic test. The battery
should be replaced as system availability has been compromised.
Battery Missing Alarm indicates that the battery is disconnected. Backup power will not be
available if the commercial power fails.
Low Battery Alarm indicates that the battery has been reduced to roughly 20% of the total
runtime available.
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