© 2012 Harmonic Inc.
67
Electra 1000, Version 3.0, Rev M
Appendix H
A/B Power Input Switch
H.1 Introduction
This appendix contains specifications for the A/B Power Input Switch.
The A/B Power Input Switch receives two separate AC main input sources (to support
redundancy), monitors the voltage, and selects the good voltage to provide one AC output for
input into either the AC or DC power supply. The A/B Power Input Switch automatically
changes from the line A input to the Line B input (or the reverse) upon loss of power on the
active line. The A/B Power Input Switch uses and monitors the active line continuously and
switches to the backup port only when the active line has a fault. The unit switches back
automatically when the active port is detected as normal and stable (with an appropriate
delay).
NOTE:
The A/B Power Input Switch is a dual-height card and can only be installed in slots 1 and 3.
The A/B Power Input Switch can be managed by the SAG.
on page 67 shows a
illustration of the A/B Power Input Switch.
Figure H-1:
A/B Power Input Switch
Pigtail power output cable
(plugs into encoder)
