When Should You Use Shielded vs. Unshielded Ethernet Cable?

The core job of DSP is to process signals. In some cases, it’s adding or subtracting from the amplitude. In other cases, it’s enhancing or suppressing parts of the frequency response, and many DSPs are excellent for reducing and/or eliminating noise from the source signal. Unfortunately, the “Garbage In-Garbage Out” theory applies to AV signals: there’s only so much that DSP can do to clean up a noisy waveform. The cleaner the incoming signal, the cleaner it will be going out. Ethernet cables, as well as many other types of cables used in AV, are in essence antennas (thin cross section + significant axial length = antenna). You don’t have…

When Do You Need An AVB Switch?

You can connect two Tesira server-class AVB devices (Tesira SERVER, SERVER-IO AVB, TesiraFORTÉ AVB) together without the use of an AVB switch. The devices must be directly connected from AVB port to AVB port. The Control ports on the server-class devices may be directly connected to one another, or connected through an Ethernet switch. If additional non-AVB Ethernet devices (EX-LOGIC, TEC-1, PC) are to be used, then an Ethernet switch is required. Any Ethernet switches used to connect non-AVB ports and devices do not need to be AVB-compatible, however it is OK to connect non-AVB devices to an AVB-compatible switch. Connecting any Tesira server-class AVB device to any non-server-class AVB…

Vocia and Tesira Are Closer Than Ever

A preoccupation for us since Tesira was released has been how to make it integrate better with Vocia. Some of our customers have crafted ways of doing it in their installs, but we wanted to create something more direct for you. With the Vocia 1.6 firmware update, Vocia amplifiers can now receive unicast CobraNet bundles from Tesira or Audia servers. That means your customers’ BGM audio channels can be sent from Tesira or Audia directly into existing Vocia amplifiers via CobraNet channels, and out through the existing speaker system. Complex, but cool. Before Vocia 1.6, the BGM signals took over entire CobraNet bundles in the Vocia world, which left fewer…

What a Vocia Nurse Call Integration System Looks Like

In this month’s sample system design guide, we’d like to show you what’s possible with the Vocia Nurse Call Integration (NCI) package in a small healthcare facility. The unique need of healthcare facilities for professional-grade networked public address, and voice evacuation systems requires a very specialized audio solution. With Vocia, the decentralized architecture distributes audio processing and page-routing across the network, which eliminates the potential for a single point of system failure. The NCI package enables a direct connection to supported Nurse Call systems such as Rauland-Borg. Because Vocia uses standard IP network protocols like Cobranet, it’s easy to scale your paging system from one floor of a hospital to…

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