The Avaya 1151B2 power supply is a desktop, single output 48-volt DC, 20-watt power supply with battery holdover. The power supply can operate within a wide range of AC input voltages: 90 - 264 VAC, 47-63 Hz. When AC power fails the battery will provide 15 minutes of holdover at full load (20 watts) or 8 hours at light load (2 watts). The 1151B2 power unit has two LED's: a green LED that shows the unit has power on the PHONE jack, pins 7&8 when AC power is applied. A YELLOW LED that shows the unit is charging the battery when illuminated. The yellow LED is off when the battery is fully charged. The GREEN LED blinking indicates the unit is running on battery power.
WITH BATTERY BACKUP