Wi-Fi network provider Xirrus Inc. has raised $10 million in a funding round, according to documents filed with the Securities and Exchange Commission this week. The Thousand Oaks company makes network devices that boost wireless directional signals for schools, convention centers and hotels. It has operations in the U.S., Europe and Australia. The funding is part of an on-going $11 million round, according to the filing. The company will use the money for working capital. A privately held startup, the firm is backed by venture capital investors including August Capital Management LLC, Canaan Partners, InterWest Partners LLC, QuestMark Partners LP, and US Venture Partners.