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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Power and LED Tests
1.9 Power and LED Tests
This section provides symptoms and solutions for power supply problems, power consumption, and LED
indicators.
1.9.1 Power Supply Problems
Symptom Loss of power or low voltage, resulting in a loss of traffic and causing the LCD clock to reset
to the default date and time.
Table 1-41 describes the potential cause(s) of the symptom and the solution(s).
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 15327. Plug the wristband cable into the ESD jack located on the lower-right outside edge of the
shelf assembly.
Caution Operations that interrupt power supply or short the power connections to the ONS 15327 are
service-affecting.
Table 1-41 Power Supply Problems
Possible Problem Solution
Loss of power or low
voltage
The ONS 15327 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 15327 that is not properly connected to its power
supply does not operate. Power problems can be confined to a specific
ONS 15327 or can affect several pieces of equipment on the site.
Note A loss of power or low voltage can result in a loss of traffic and
causes the LCD clock on the ONS 15327 to default to January 1,
1970, 00:04:15. To reset the clock, in node view click the
Provisioning > General tabs and change the Date and Time fields.
See the “Isolate the Cause of Power Supply Problems” procedure on
page 1-79.
Improperly connected
power supply