DALLAS, Dec. 25 -- White Rock Networks, a provider of next-generation optical transport systems for the local metro transport market,announced it has received $42 million in fourth-round venture funding. The funding will be used to continue the development of White Rock's modular family of optical networking products and support the continued growth of its sales and support activities. This round brings the total funds raised by White Rock Networks to $144 million since its inception in 1999. In previous rounds, the company raised $12 million in February 2000, followed by $30 million in June 2000 and $60 million in November 2001. Led by Oak Investment Partners, all of White Rock's existing major investors have invested again: Oak Investment Partners, Mayfield Fund, Meritech Capital, Fremont Communications, Fremont Ventures, Investor AB (through its wholly owned subsidiary, Investor Growth Capital), Hook Partners, Gulf International Bank and Pacesetter Capital Group. A new investor, 3i, has joined the round. For more information, visit: www.whiterock.com