Biamp Tesira Manual

Specifying PoE switches for Biamp Tesira devices
Many Biamp products are powered using PoE (Power over Ethernet) from a network switch. When powering many
devices from one switch, it's important to ensure that the switch has enough power to supply all connected devices. This
article is designed to aid AV network designers in PoE budget calculations for Tesira systems.

Initial considerations

In addition to ensuring network switches can handle the traffic that is intended to be transmitted through them, it is
important to make sure the switches can power all the connected PoE devices.
PoE (Power Over Ethernet) is a set of standards developed by the IEEE under the 802.3 publication that
describes power provision over Ethernet.
PoE Budget is a specification of network switches and multi-port PoE injectors. This power budget is a shared
resource available as needed to all ports. Each PoE device negotiates power needs with the switch or PoE
injector based on the class of the device. The device is then provided with power from the PoE budget
accordingly.
PoE budget may be exceeded during system operation if a network switch is not properly specified. This will cause the
switch to turn off PoE on one and possibly all the ports. The communication with endpoint devices will be interrupted and
Tesira performance could be temporarily or even permanently compromised.
The terms PoE and PoE+ have some overlap in meaning. For this reason, PoE and PoE+ equipment will be generically
referred to as "PoE equipment" throughout this article.

Calculating PoE device counts

Calculating how many devices a single network switch can power will help identify how many switches are required to
power all the PoE devices in the system.
Please follow these steps:
1. Check the total PoE budget of the switch in the manufacturer's specification.
2. Check the Biamp endpoint device's PoE class using the provided technical documentation or this
devices reference chart.
3. Make note of the "Max Power From Switch" value for the PoE class of your selected endpoint devices. *
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Tesira PoE
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