From the Manufacturer
The Network Optimizer for Gaming and VoIP from Linksys streamlines your home network for next-generation Internet applications. By applying various Quality of Service (QoS) techniques to your network

The Linksys Network Optimizer streamlines your network traffic. See how it works. |
traffic, the Network Optimizer makes sure time-sensitive applications like online gaming and VoIP calls run smoothly.
The Network Optimizer sits between your home router and broadband cable or DSL modem, and monitors the data going through. It automatically determines what data is time-sensitive and what isn't, and prioritizes delivery of that data to its destination, ensuring the best-possible performance for the various types of data that go through your network.
Traffic prioritization helps make sure that your online games don't lag when someone else on the network is surfing the web or sending email. Voice over IP phone calls sound cleaner. Outgoing streamed video from your Internet Video Camera runs smoother. And the best part is that the Network Optimizer takes care of prioritizing the data automatically, with no user setup of QoS policies required. After a simple installation it gets right to work, enhancing your network's performance and helping you get the most out of your high-speed Internet connection.
The Network Optimizer features two standard ethernet ports and four LED status lights that indicate power, activity, and connectivity with the modem and router.
What's in the Box
Network Optimizer, power adapter, ethernet cable, quick installation guide, and user guide on CD-ROM.
Product Description
The SPA400 features the ability to connect up to four (4) standard analog telephones lines to a Linksys Voice System (LVS) VoIP network and includes the additional benefit of an integrated voicemail application. The SPA400 utilizes multiple analog phone lines and automatically routes calls to and from your existing PSTN telephone service. Designed to be implemented with the LVS IP Telephony System, the SPA400 enables cost-conscience business users to leverage the high value features generally found only on more expensive PBX equipment. The SPA400 also includes an integrated voicemail application supporting up to 32 voicemail accounts or boxes with customized greetings, providing LVS users the ability to receive and playback voicemail messages from their Linksys IP Phones. The SPA400 supports four (4) RJ-11 FXO ports to connect to the PSTN and also includes one 10/100 BaseT RJ-45 Ethernet interface that is used to connect to the local IP network. Compact in design, the SPA400 is perfectly suited for a small business in providing reliable operation for both VoIP and PSTN voice communication service.