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is planning to acquire Test-Um, a provider of test instruments for the fiber-networking and digital-cable markets.

Financial terms of the deal weren't disclosed. The acquisition should be completed in the current quarter, JDSU said Thursday.

Test-Um, based in Camarillo, Calif., makes "three-wire" test instruments that ensure the ability of home wiring to handle high-bandwidth voice, data and video services.

The company's instruments include test sets for verifying line conditions and power-signal levels, wireless testers that facilitate communications on the job, and tone tracing and identification to locate and track cable runs.

Shares of JDSU, based in San Jose, Calif., were up 9 cents, or 2.5%, to $3.71.