Specifications

Circuit packs, channel service units, and power supplies
214 Hardware Description and Reference for Avaya Communication Manager
631DB1 AC power unit
A 631DB1 power unit accepts 60-Hz, 120-VAC input power. The unit provides DC power for the
backplanes of an MCC1 Media Gateway’s carriers at the following voltages:
● –48 V at 8 A
● –5 V at 6 A
. The DC output of –48 V also drives the cabinet’s fans.
If AC input power fails, the power unit can convert 144 VDC from optional batteries in an
AC power-distribution unit to +5 VDC. A circuit in the optional battery charger detects the higher
equivalent (AC- or DC-input) voltage and switches in the correct input voltage.
649A DC power converter
Note:
Note: This power converter is no longer sold.
A 649A power converter converts a DC input of –48 V into DC outputs of:
● –48 V at 10 A
● ±5 V at 6 A
for an MCC1 Media Gateway. Within a carrier, these outputs are distributed to the circuit packs’
slots. Only one 649A converter is required per carrier except for switch node (SN) carriers. SN
carriers require two converters, one on each end. The use of the 649A power unit also allows an
increase in the number of telephones that each carrier can support.
650A AC power unit
This global power-factor-corrected supply accepts 47- to 63-Hz AC input, while auto-ranging
between 85-VAC and 264-VAC input. The 650A power unit provides 330 watts of total output
and provides multiple DC outputs as follows:
● +5.1 VDC at 28 A
● –5.1 VDC at 1.0 A
● –48 VDC at 4.5 A