Nortel Expects Lower 3rd-Quarter Revenue  TORONTO (Reuters) - Nortel Networks Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NT.TO target=/stocks/quickinfo/fullquote"&gt;NT.TO&lt;/A&gt; said it  expects to report lower third-quarter revenues compared to the  second quarter, North America's largest maker of telecom  equipment said in a regulator required market update on  Thursday.