JDSU ( JDSU) adds a wireless piece to its phone network testing business.

The San Jose, Calif.-based networking-parts maker says it is in a deal to acquire Renton, Wash.-based Casabyte, a developer of wireless network monitoring systems. No terms were disclosed. JDSU expects to close the deal by the end of March.

In 2005, still reeling from the collapse of the telecom industry, JDSU realigned its operations by acquiring Acterna, a network test and measurement specialist.

Though network monitoring was a bit outside JDSU's expertise, the move helped the company weather the slump in optical-component demand by adding another revenue source.

"With the addition of Casabyte's product portfolio, JDSU offers the industry's broadest set of service assurance solutions for the deployment of 'quad-play' broadband services for consumers and businesses," JDSU testing chief John Peeler said in a press release.

JDSU shares rose 9 cents to $17.29 in early trading Thursday.

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