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Cisco ONS 15454 Series Multiservice Provisioning Platforms

Field Notice: FN - 29146 - ONS 15454 and 15454E TCC2 Has Miscalibrated 48V Monitor Circuit


Revised May 2, 2006

March 2, 2004


NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected

Product

Top Assembly

Comments

Part Number

Rev.

15454-TCC2

800-20761-02

All

Only the boards with the serial number starting with "SAG" are affected.

15454-TCC2

800-20761-01

C0

Only the boards with the serial number starting with "SAG" are affected.

15454E-TCC2

800-20761-02

All

Only the boards with the serial number starting with "SAG" are affected.

                 

Problem Description

Troubleshooting of this issue has revealed that some of the cards have been incorrectly calibrated during the manufacturing flow.

Note: Not all cards within this part number, and revision are affected

A false voltage threshold alarm is generated because the calibration is 0.5 volts to 2.0 volts off. If the active TCC2 is a newer card and not affected by this field notice and the standby TCC2 is an older card and is affected by this field notice, then no alarms are raised on CTC. However, the affected standby card's PWR A or PWR B LEDs will be lit red. When the active newer TCC2 is switched to standby and the affected standby TCC2 is now the active card, then the High Volt (HIBATVG) alarms will be reported on PWR-A and PWR-B on CTC.

Background

The ability to monitor the -48V A and B voltage inputs was designed into the TCC2 card, which began shipping as part of the software version 4.0.

The power inputs are converted to digital values via analog to digital converters and are made available for software to read.

Software multiplies these values by a calibration factor to reflect the actual voltage seen at the Shelf's terminal block, then uses them to determine if the major battery high and low alarms should be raised.

Default thresholds for these two sets of alarms (A and B) are -44V and -54V respectively.

All values are being read and multiplied correctly according to the set thresholds from manufacturing.

Problem Symptoms

Incorrect reporting of voltage.

A false voltage threshold alarm is generated.

On a node, it was noticed that the A & B PWR lights on the standby TCC2 were red, without any corresponding alarms in CTC. The active TCC2 in slot 11 had green lights.

When the active TCC2 was switched to slot 7, the alarms were then declared.

The HIBATVG alarm is reported in the CTC only when the active TCC2 has the miscalabration issue.

The A & B lights on the faceplate will always be on, regardless of which card is active.

Workaround/Solution

In order to remove the alarms that might show up on the Cisco Transport Controller (CTC), you must go into the alarm filter screen and turn off the visibility of those HIBATVG alarms.

  1. Go to the "Alarms" tab within CTC, and click on the "Filters button".

  2. Once you are into the filter screen, click on the "conditions" tab, and scroll down to where the HIBATVG alarms are located. Move the HIBATVG alarms over with the arrow buttons to "Hide", hit the Apply button and you are finished.

    Turning off these alarms does not affect the loss of power alarms for the A and B power feeds, and is not service affecting.

How to Identify Hardware Levels

To determine the Part Number, Hardware Revision and Serial Number of your 15454 TCC2 boards:

Open CTC.

From the Shelf View, select Inventory

From the Inventory tab, locate the TCC2 boards and compare the information from the Inventory tab against the Products Affected section above.

fn29146_i2b4hw.gif

Click image to view larger version.

If the above process is not acceptable, please RMA the cards.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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