How to understand Lofs,Loss,Lols,Lprs,ES

hi all,
In the course of testing performance management of DSLAM, I need to simulate some events to
increase MIB counters, such as adslAtucPerfCurr15MinLofs,adslAtucPerfCurr15MinLols,etc, so
these counters can reach the threshold, trap info can be gotten. But I am confused with
definition of Lofs,Loss,Lols,Lprs,ES and other channel performance data.
1.The definition of adslAtucPerfCurr15MinLofs is "Count of seconds in the current 15-minute
interval when there was Loss of Framing.", it is same for Loss,Lols,Lprs. I don't understand
these definitions well, how can I control the happen of these events, the tools I have are
Line simulator,SmartBits (from spirent);
2.The definition of AtucChanPerfCurr15MinRxBlks is "Count of all encoded blocks received on
this
channel, within the current 15-minute interval.", what's the meaning of encoded blocks? The
definition of AtucChanPerfCurr15MinCorrectedBlks is "Count of all encoded blocks received
with corrected errors on this channel, within the current 15-minute interval.", how to judge
the encoded blocks have errors or not, checksum? or CRC?
Thanks in advance
Best Regards

The Cisco management framework is consistent with the Telecommunication Management Network (TMN). Like TMN, Cisco uses a five-layer model that defines both the logical division and the communication between areas of the service provider's business operations and management processes. Consistent with this architecture, Cisco has developed a suite of service, network, and element management solutions.
http://www.cisco.com/en/US/products/hw/switches/ps1925/products_technical_reference_chapter09186a00800e9791.html

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