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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.163 HITEMP
Note When you upgrade a node to Software Release 6.0 or later, this enables received optical power PMs for
the OC3-8, OC192-SR, OC192-IR, OC192-ITU, OC-192-XFP, MRC-12, and MRC25G-4 cards. The
newly enabled HI-RXPOWER and LO-RXPOWER alarms require that you initialize a site-accepted
optical power (OPR0) nominal value after the upgrade. (To do this, refer to the procedure in the “Turn
Up a Node” chapter in the Cisco ONS 15454 Procedure Guide.) When you apply the value change, CTC
uses the new OPR0 value to calculate PM percentage values. If you do not change the nominal value, the
HI-RXPOWER or LO-RXPOWER may be raised in response to the unmodified setting.
Clear the HI-RXPOWER Alarm
Step 1 Find out whether gain (the amplification power) of any amplifiers has been changed. This change also
causes channel power to need adjustment.
Step 2 Find out whether channels have been dropped from the fiber. Increasing or decreasing channels can
affect power. If channels have been dropped, the power levels of all channels have to be adjusted.
Note If the card is part of an amplified DWDM system, dropping channels on the fiber affects the
transmission power of each channel more than it would in an unamplified system.
Step 3 At the transmit end of the errored circuit, decrease the transmit power level within safe limits.
Step 4 If neither of these problems cause the HI-RXPOWER alarm, there is a slight possibility that another
wavelength is drifting on top of the alarmed signal. In this case, the receiver gets signals from two
transmitters at the same time and data alarms would be present. If wavelengths are drifting, the data is
garbled and receive power increases by about +3 dBm.
Step 5 If the alarm does not clear, add fiber attenuators to the receive ports. Start with low-resistance attenuators
and use stronger ones as needed, depending on factors such as the transmission distance, according to
standard practice.
Step 6 If the alarm does not clear and no faults are present on the other port(s) of the transmit or receive card,
use a known-good loopback cable to complete the “1.6.1 Perform a Facility Loopback on a
Source-Node FC_MR Port” procedure on page 1-94 and test the loopback.
Step 7 If a port is bad and you need to use all the port bandwidth, complete the “Physically Replace a Traffic
Card” procedure on page 2-273. If the port is bad but you can move the traffic to another port, replace
the card at the next available maintenance window.
Step 8 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC 1 800 553-2447.
2.7.163 HITEMP
Default Severity: Critical (CR), Service-Affecting (SA) for NE; Default Severity: Minor (MN),
Non-Service-Affecting (NSA) for EQPT
SONET Logical Objects: EQPT, NE
The High Temperature alarm occurs when the temperature of the ONS 15454 is above 122 degrees F
(50 degrees C).
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