July 13 (Reuters) - Juniper Networks (JNPR.N) forecast third-quarter revenue below market estimates on Thursday on lower spending by cloud computing clients in a turbulent economy, sending the shares of the networking equipment maker down 6% after the bell. Cloud service providers have been cutting back on orders for infrastructure equipment such as routers and switches in a blow for companies like Juniper Networks due to an overall drop in tech spending. Juniper, which also provides network management software for companies like AT&T, Seagate and BlackBerry, said it expects revenue of about $1.38 billion, plus or minus $50 million, in the third quarter. It forecast adjusted earnings per share of 54 cents, plus or minus 5 cents, which was below expectations of 62 cents. On an adjusted basis, the company earned 58 cents per share, compared with estimates of 55 cents.

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Persons: Rami Rahim, Zaheer Kachwala, Pooja Desai, Arun Koyyur Organizations: Juniper Networks, Seagate, BlackBerry, Thomson