January 30, 2012
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Revision Date Comment 1.0 30-JAN-2012 Initial Public Release
Products Affected RFC38 - A93270.10240 RFC38 - A93270.10340 RFC38 - A93280.10240 RFC38 - A93280.10340
The Compact EGC Single and Dual Amplifier may occasionally produce an error in the measurement of the AC voltage (network power) which will only be noticeable when the amplifier is equipped with a transponder that communicates to a management system (for example, ROSA EM, ROSA NMS, etc.). The management system will generate a false alarm since it receives an AC voltage measurement that is out of range of the minor or major alarm limits. The faulty measurement will only occur for a few minutes, and restore automatically until it occurs again. The interval between two faulty measurements depends on different elements and goes from a couple of hours to several days/months. The overall performance of the amplifier as well as your experience will not be affected.
The measuring routing in the firmware has been modified in order to allow the amplifier's microprocessor to sample the AC voltage each 8 milliseconds instead of each 528 milliseconds. This improves the accuracy of the measurement and avoids the errors.
AC power voltage alarms that occasionally occur will be present for some minutes and then be cleared. In a typical deployment, this will occur in one unit at a time so there will be no correlation with other units in the network.
The problem most likely appears when the AC voltage is in the shape of a sine wave. Most AC power supplies deployed in HFC networks are quasi-square wave, and thus the problem will not be noticed.
The problem can also be influenced by changes in the environmental temperature. During long periods (months), the problem could go unnoticed, but a change in the environmental temperature can cause the problem to occur. Since this is caused by the tolerance on components, it is not possible to predict if it is at low or high temperatures. Each unit can be different.
This problem is resolved with a firmware upgrade using a firmware download kit which will be available to customers March of 2012 from the Cisco.com website.
In the meantime, units can be returned under the RMA process to be upgraded if the customer chooses. Please note that overall system and your experience are not impacted by this issue and you can choose to wait for the firmware upgrade available in March 2012.
The issue has been solved in these firmware versions:
- A93270 SW version: DEA_1.03.16 (SW file 7016991_D)
- A93280 SW version: SEA_1.00.10 (SW file 7018526_B)
For More Information
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