Power
Issue 8.0 July 2002
4-7
LEDs 4
The green PWR ON LED (located on the user panel and filter panel) and the
circuit pack red FAULT LED (located on the circuit pack faceplates) are associated
with shelf and circuit pack power. The green PWR ON LED shows that the shelf is
receiving fused −48 volt power. The green PWR ON LED will remain lighted as
long as either −48 volt power feeder is supplying power to the shelf.
The red FAULT LED shows circuit pack failures. If the fuse or DC-to-DC converter
fails on a transmission circuit pack at an FT-2000 OC-48 Repeater Bay, the red
FAULT LED will be operated via a separate power path from the System Controller
(SYSCTL) circuit pack.
If the fuse or DC-to-DC converter fails on a transmission or synchronization circuit
pack at an FT-2000 OC-48 Add/Drop-Rings Terminal, the red FAULT LED will be
operated via a separate power path from the Line Controller (LNCTL) circuit pack.
If the fuse or DC-to-DC converter fails on the LNCTL, Overhead Controller —
Terminal (OHCTL [TERM]), or System Memory (SYSMEM) circuit pack, the red
FAULT LED will be operated via a separate power path from the SYSCTL circuit
pack. If the fuse or DC-to-DC converter fails on the SYSCTL circuit pack, the red
FAULT LED will be operated via a separate power path from the SYSMEM circuit
pack.
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