Hardware Description and Reference for Avaya ... - Avaya Support

SCC1 power systems
Each SCC1 has one AC power supply or one DC power supply. These power supplies distribute
DC power and AC ringing voltage to the circuit pack slots in the cabinet.
AC power supply (1217A)
In an AC-powered cabinet, the power supply slot contains a single, plug-in, multioutput AC
power supply. A power cord, with a three-prong plug on one end and an appliance connector on
the other end, connects the supply to a dedicated AC power source.
The 1217A power supply is a global power unit for SCC1s. The 1217A power supply has a wide
input voltage operating range of 90 VAC to 264 VAC and a 50 Hz or 60 Hz autoranging input. A
multioutput power supply also provides regulated DC output. The 1217A also has a selectable
20 or 25 Hz AC ringer.
The 1217A power supply uses one of the following inputs, depending on the version:
● 120-VAC, 60-Hz, 15-A to 20-A with three wires in the power cord: one hot wire, one neutral
wire, and one ground wire
● 220-VAC or 240-VAC, 50-Hz, 10-A with three wires in the power cord: one hot wire, one
neutral wire, and one ground wire
The AC power supply produces the following DC outputs: +5 VDC, –5 VDC, –48 VDC, +12
VDC, and a battery-charging voltage. The DC outputs distribute power in the cabinet backplane
to the circuit pack slots. Additionally, the -48 VDC output current is 0 A to 8.25 A.
A holdover circuit in the power supply allows a system to operate normally during AC power
interruptions. If AC input power fails, reserve batteries supply power to the memory and the
processor circuit packs and the fans for 2 minutes. All port circuit packs are inactive during this
time. The power supply contains a battery charger to charge the holdover batteries.
DC power supply (676C)
In a DC-powered SCC, the power slots contain a single, plug-in multioutput DC power supply.
The 676C DC power supply has a wide input voltage operating range of -42 VDC to -60 VDC at
up to 22 A. The 676C power supply produces the following outputs:
● +5.1 VDC at 0 to 55 A
● -5.1 VDC at 0 to 5.5A
● +12 VDC at 0 to 2 A (surge to 2.8 A for 350 ms)
● -48 VDC at 0 to 8.25 A.
The outputs distribute power on the cabinet backplane to the slots for the circuit packs. The
value and the frequency of the AC ringing voltage output value depend on the country of use.
The power supply has circuit breakers and EMI filtering.
Issue 6 February 2007 415