The Canadian telecoms equipment manufacturer, which entered into administration in January, has already revealed large-scale job cuts in an effort to reduce costs.
But the reported US$5.8bn loss, representing US$11.64 per share, compared with a loss of US$957m or US$1.98 per share in 2007, will be a major blow to its plans to emerge from bankruptcy protection as a viable business.
Fourth-quarter revenue fell 15 per cent to US$2.72bn from US$3.2bn in the same quarter in 2007.
"As Nortel continues to work through a complex global restructuring of its business, our focus remains firmly on maintaining high customer service levels for on time delivery, network stability and responsiveness," said Nortel president and chief executive Mike Zafirovski.
"Work is taking place across Nortel to develop a comprehensive plan to restructure Nortel into a more focused, leaner and more competitive company."
