NSN sells wireline business to Adtran. Here is why.

NSN's headquarters

Nokia Siemens Networks (s nok)(s si) said it will sell its wireline broadband assets to ADTRAN for an undisclosed amount. The deal is the second in as many months for NSN, which had previously been hoping for a buyer for its entire business. The company, which is a joint venture between Siemens and Nokia, says it is planning to exit lines of business that fall outside the bustling mobile broadband industry, but it may also be an effort to slim down to find a buyer.

Nokia said it expected to close the sale of its fixed line broadband access business and associated professional services to ADTRAN, a wireline gear provider, in April 2012. NSN in November had sold its microwave packet business to DragonWave in a cash and stock deal.

NSN has had a rocky time along with the rest of the telecommunications gear industry as consolidation among customers and competition from Huawei and ZTE have put the squeeze on vendors such as Nortel (it filed for bankruptcy), Motorola (it split its businesses), (s mmi)(s msi) Ericsson (it has decided to focus on mobile broadband as well) (s eric) and Alcatel-Lucent (s alu) (it is trying to worm into the cloud market). The company has attempted to find a private equity buyer, but gave up and announced a restructuring in November.

Image of NSN’s HQ courtesy of NSN.