Recommendation R.11

Add the following sentences to the note:

"Pending further study and more specific advice, arithmetic addition of distortion can be safely assumed for simplicity in all cases. Although pessimistic this will not lead to unnecessarily restrictive planning decisions in those cases where there is a regenerative link in the chain, e.g., Recommendation R.101 TDM or a regenerative SPC exchange. However, where another law is known to apply then the appropriate law of addition can be used.

e.g.:

mcvft	-	see text of Recommendation above

code-independent tdm	-	see note above for non-synchronized tandemed systems

-	for synchronized tandemed systems the distortion due to the multiplexing process will be that of a single system

code-dependent tdm	-	regenerative"