Some corrected bytes is ok, but not too many. Your best bet would be to use a QAM analyzer to see how your system is performing, if you are having problems.
Common problems:
System sweep(Calan3010H) not set up correctly guard bands,dwell times ect...
Overdriving lasers or setup of lasers (total power into laser or having awsome CNR, but not great CSO/CTB)
Dirty fiber you would also see bad CNR.
These are just some common things. In our system we went for NO errors and we are running 550Mhz of analog and 200Mhz of 256QAM digital carriers. To do this I basically started at the head end and worked my way to the nodes optimizing each optical transport. I used a QAM analyzer and the in the end would check it with a digital box at the end of line of each leg of a node. I know this is very time consuming, but it worked. It took me and a crew of 10 guys about a year to complete it.
As far as what is too many errors before tiling, that is known as the CLIFF EFFECT. check this link out it should help explain:
http://www.ct-magazine.com/archives/ct/1203/1203_qam.html
Re: Digi box corrected bytes
Member #: 38954
Registered: 6/28/2005
Posted:
201
Name:
Scott
Company:
Private MSO
Occupation:
Head End Tech
Location:
NE
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