During field installation, the 15454-32-DMX and 15454-40-DMX-C= have shown a power degrade on the channel TX (output) ports.
The problem was triggered when the optical power was counter-propagating into the card. The variable optical attenuator (VOA) control routine is confused by the unexpected counter-propagating light, triggering the VOA regulation.
The regulation ends only when the VOA attenuation reaches its maximum value.
Adding new channels in a node equipped with the 32-DMX, or 40-DMX can cause an automatic reduction of the in-service TX channels ports by the system, and result in optical power related alarms.
The affected vendor parts are cards with ID# 2049, and 2050 for the 32-DMX, and ID# 2304 and 2306 for the 40-DMX= only.
The in-service wavelengths were working properly until new services/wavelengths were added, and a transponder's patch-cord was connected incorrectly, which resulted in light being injected at the output (TX) of the 15454-32-DMX and the 15454-40-DMX-C= cards.
We found that the counter-propagating light was the problem causing power degrade on that port.
Condition: Wrong cabling of transponders or line-cards to fiber patch-panel, in particular, swapping the receive(RX) with the transmit (TX) patch-cords.
With the 32-DMC-C, 32-DMX-L, and the 40-DMX-C= cards condition above, the counter-propagating light resulting from the bad cabling can impact the internal variable optical attenuator (VOA) control loop, leading to an increased optical path attenuation.
To prevent traffic being affected at creation of a new circuit, the following procedure is suggested to quickly detect improper cabling of 32-DMX or 40-DMX cards:
Replace the affected hardware if you still have the problem.
As of approximately January 15, 2008, new products that were manufactured under an Engineering Change Order are guaranteed to be free of this problem.
Refer to How to Identify Hardware Levels below for instructions on how to view the version of in-service product.
Cisco recommends a fix-on-fail strategy for this problem.
Service Logistics has known-good inventory at this time. The standard RMA process and delivery times are in effect.
To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.
Note: Only the combination of the cards with the ID #2049, or ID #2050 and the Serial Numbers in the validation tool are affected.
Note: The 15454-40-DMX-C= cards are not included in the Serial validation tool.
To determine the Part Number of your ONS 15454-32-DMX or 15454-40-DMX-C= cards:
Open Cisco Transport Controller.
From the Shelf View, select Inventory
From the Inventory tab, locate the 15454-32-DMX or 15454-40-DMX-C= boards and compare the information from the Inventory tab against the Products Affected.
The Vendor ID# 2049, or 2050 for the 15454-32-DMX, or the Vendor ID# 2304, or 2306 for the 15454-40-DMX-C= is visible under the "Value section" of the inventory tab.
If you are using TL1 commands.
Compare the information from the TL1 inventory command against the Products Affected section above, and the Vendor ID#.
Note: Only the specified Vendor ID#'s in this field notice are affected.
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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