How can I silence my modem?

At the time, there was much debate as to the favorability of DV and DO. Traditional operators with an existing voice network preferred deploying DV, since it does not require an overlay. Other design engineers, and newer operators without a 1x voice network felt that EV-DO was a superior choice to 1xEV-DV because it did not have to be backward compatible, and thus was free to explore different pilot structures, reverse link silence periods, improved control channels, etc. In addition, since 1xEV-DO uses an IP network and does not require a SS7 network and complex network switches such as an MSC (mobile switching center), the network cost is less than that of 1xEV-DV. Another factor that affected operators' decision to use 1xEV-DO was equipment was not available for 1xEV-DV in time to meet market demands whereas the 1xEV-DO equipment and mobile ASICs were available and tested by the time the 1xEV-DV standard was completed. As a result, the 1xEV-DV standard was less attractive to operators, and has not been implemented. With the announcement by Verizon Wireless and later Sprint Nextel in 2004 of plans for deployment of 1xEV-DO, and similar announcements by smaller operators in 2005, Qualcomm in March 2005 suspended development of 1xEV-DV chipsets, and focused its efforts toward improving the 1xEV-DO product line.