Specifications
2-36
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
2.6 Power and LED Tests
This section provides the “Power Supply Problems” section on page 2-36, the “Power Consumption for
Node and Cards” section on page 2-37, and the “Lamp Test for Card LEDs” section on page 2-37.
2.6.1 Power Supply Problems
The ONS 15454 requires a constant source of DC power to properly function. Input power is -48 VDC.
Power requirements range from -42 VDC to -57 VDC.
A newly installed ONS 15454 that is not properly connected to its power supply will not operate. Power
problems can be confined to a specific ONS 15454 or affect several pieces of equipment on the site.
A loss of power or low voltage can result in a loss of traffic and causes the LCD clock on the ONS 15454
to default to January 1, 1970, 00:04:15. For clock reset instructions, refer to the Cisco ONS 15454
Installation and Operations Guide.
Caution Operations that interrupt power supply or short the power connections to the ONS 15454 are service
affecting.
Warning
When working with live power, always use proper tools and eye protection.
Warning
Always use the supplied electrostatic discharge (ESD) wristband when working with a powered
ONS 15454. Plug the wristband cable into the ESD jack located on the lower-right outside edge of
the shelf assembly.
Procedure: Isolate the Cause of Power Supply Problems
Step 1 If a single ONS 15454 show signs of fluctuating power or power loss:
a. Check that the -48 VDC #8 power terminals are properly connected to a fuse panel. These power
terminals are located on the lower section of the backplane EIA under the clear plastic cover.
b. Check that the power cable is #12 or #14 AWG and in good condition.
c. Check for properly crimped power cable connections. Stranded #12 or #14 AWG does not always
crimp properly with Staycon type connectors.
d. Check that 20A fuses are used in the fuse panel.
e. Check that the fuses are not blown.
f. Check that a rack ground cable attaches to the frame ground terminal (FGND) on the right side of
the ONS 15454 EIA. Connect this cable to the ground terminal according to local site practice.
g. Check that the DC power source has enough capacity to carry the power load.
h. If the DC power source is battery based:
–
Check that the output power is high enough. Power requirements range from -42 VDC to -57
VDC.