Verizon still cagey about cause of LTE outage

SAN JOSE, Calif.--Verizon Wireless (NYSE:VZ) continues to evade questions about the cause of a 24-hour outage of its LTE network that occurred late last month.

At an Ericsson-hosted Business Innovation event here, Brian Higgins, executive director of LTE ecosystem development at Verizon Wireless, said the company learned some lessons from its outage and is making sure it won't happen again. "Adjustments have been made," he said. However, he did not provide any more details about the exact cause of the outage.

In late April, Verizon Wireless' nationwide LTE network was down for more than 24 hours. The outage was the first major hiccup for Verizon's vaunted next-generation network that it launched in December. Alcatel-Lucent (NYSE:ALU) and Ericsson (NASDAQ:ERIC) are Verizon's main infrastructure vendors for its LTE network.  

At the Ericsson event, Arun Bhikshesvaran, vice president of strategy and market development for Ericsson North America, also refused to further elaborate on the cause of the outage. However, he did say that he was in close contact with Verizon during the outage.

Phil Marshall, an analyst at Tolaga Research, told FierceWireless at the time of the outage he believed the cause was most likely a software glitch. "It sounds like it would be further up the chain, more within the core network," he said. "When you get a catastrophic fault like that, it tends to be more of a software issue. Perhaps someone made some changes in the network or changed some settings."

Cisco Systems provides the common packet data network (PDN) gateways for Verizon's LTE network, while Alcatel-Lucent and Nokia Siemens Networks both supply elements of the IP Multimedia Subsystem (IMS) architecture.

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