Zacks lowers Tellabs (TLAB) to Underperform, seeing more disappointing financial results for the...

|By:, SA News Editor

Zacks lowers Tellabs (TLAB) to Underperform, seeing more disappointing financial results for the firm. AT&T's (T) decision to upgrade its network with 4G-ready pure Ethernet solutions from competitors Cisco (CSCO) and Alcatel-Lucent (ALU) hurts the firm's ability to maintain steady revenue.