Pittsburgh-based networking products and services marketer Black Box Corp. (Nasdaq: BBOX) posted a19% decrease in net revenue for the quarter ended Dec. 31, to $179 million from $221 million the previous year. Net income increased a bit, to $16.9 million, or 9.4% of revenues, compared with $16.8 million, or 7.6% of revenue, 12 months prior. Cash flow was a record $28.9 million, compared with $17.2 million last year.