Cisco Cisco ONS 15454 SDH Multiservice Provisioning Platform (MSPP)

STM64LH

STM16LH

XC10G

The alarms could potentially occur on any of these boards, as well: OC48AS, GigE, OC192 or 
OC192LR. This issue will be resolved in a future release.

E1-14 boards with second source components can incur bit errors under extreme environmental 
conditions. When these boards operate under voltage and temperature stress conditions and a 
temperature ramp rate of 1 degree per minute, the boards could exhibit dribbling bit errors at high 
temperatures: BER = 5.5e-6. To avoid this, you must apply the temperature ramp rate at 0.5 degree per 
minute. This ramp rate complies with the NEBS standard; however, this issue will be revisited in a future 
release.

Before you upgrade to Release 4.6.1 from Release 4.0, 4.0.1, or 4.1, you must read this caveat and run 
the SDH Circuit Repair Utility (VcCheck) provided on the software CD (also available on CCO).

The XCVXL card on the ONS 15454 SDH allows the intermixing of VC12 and VC3 payloads within a 
single VC4. When a VC4 contains only one VC12 tributary and at least one VC3 tributary and the VC12 
is deleted, the database becomes corrupt. 

The database load process on the ONS 15454 SDH occurs during a TCC2 reboot, TCC2 protection 
switch, software activation, or database restore. When the database is loaded containing this corruption 
the load process fails, causing the corrupt database to be deleted from the TCC2 flash memory. The 
previous saved database is then loaded instead. When all saved databases on a TCC2 contain the 
corruption, the TCC2 will load with the default provisioning, and all existing provisioning will be lost. 

If this issue occurs you will see a loss of either some or all provisioning after a TCC2 switch or reset. 

To ensure that your network is not vulnerable to this issue, you must first determine if the issue already 
exists within your network, and if so, correct it.  You can detect the issue  by using the SDH Circuit 
Repair Utility (VcCheck) provided on the ONS 15454 SDH Release 4.1.3 and 4.6.1 software CDs. The 
VcCheck tool is also available for download from CCO. Once you have alleviated immediate risk from 
the issue, you must upgrade to Release 4.6.1, or maintenance Release 4.1.3 (or any later release) to avoid 
further risk. 

The VcCheck utility and its associated README file (in the same directory with the tool) provide 
details on how to temporarily alleviate this issue before upgrading to a release in which the issue is 
resolved. 

This issue is resolved in Release 4.6 and maintenance Release 4.1.3 (caveated herein because of the 
upgrade issue).