Specifications

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S1145R Power Unit Operation Manual
The S1145R Power Unit is a direct replacement for the Lucent/ATT 1145A, B1, and B2
ISDN power units. Features include 200 watts of output power, a low voltage battery
disconnect and compatibility with the existing wall mounting plate and connection
wiring.
The S1145R Power Unit provides a nominal 48 volt DC output voltage at up to 4.2 amps
with the ability to power up to 96 ISDN phones. Connectors are provided for power to an
1146 block and a backup battery pack. Backup batteries are connected in parallel to the
load so there is no delay in switching to backup power when AC power is lost.
Technical Specifications
Electrical Environmental
Input Voltage: 120/240 Vac +10%/-15%
Jumper selectable
Frequency: 45-66 Hz
Input Current: 2 Amps AC maximum
Output Voltage: 48 Vdc nominal
42.5 Vdc min-55.2Vdc max
Output Current: 4.2 Amps DC maximum
Operating Temperature: -20°C to +40°C
Humidity: 95% non-condensing
LED Indicator Standards
Green – On AC Power
Red – On Battery Power
UL1950
Connectors
Two Pin Battery Pack Connector
Pin 1 – (+V)
Pin 2 – (-V)
Eight Pin Power Connector
Pin 1 – Unused Pin 2 - Unused
Pin 3 – (+V) Pin 4 – (-V)
Pin 5 – Unused Pin 6 – Unused
Pin 7 – Unused Pin 8 – (-V)