Hewlett-Packard Co and L M Ericsson Telefon AB duly announced formation of their network management systems joint venture yesterday. The new Ericsson Hewlett-Packard Telecommunications AB will be 60% owned by Ericsson; 40% by Hewlett. No financial details were given; the deal is subject to European Commission approval. The venture, headquartered in Stockholm with Gothenburg and Grenoble bases, is expected to employ 350 people, and will begin operations in first quarter of 1993. As expected, Ericsson tosses in major parts of its Telecommunications Management and Operations Support family, of which it has sold 65 systems. The products go through Ericsson channels.