Cisco 7937G Administration Guide - Page 29

Chapter 2 Preparing to Install the Conference Station on Your Network Providing Power to the Conference Station These sections provide more information about powering a conference station: • Power Guidelines, page 2-3 • Conference Station Power Consumption and Display Brightness, page 2-3 • Power Outage, page 2-4 • Obtaining Additional Information about Power, page 2-4 Power Guidelines Table 2-1 provides guidelines that apply to external power and to PoE power for conference stations. Table 2-1 Guidelines for Powering the Conference Station Power Type Guidelines External power-Provided by an external power supply • The conference station is rated 48 V DC, 0.375 A. When you use the conference station with an optional external power supply, the power supply must be a listed power supply with a Limited Power Source (LPS) output that is rated 48 V, min 0.375 A. PoE power-Provided by a switch through the Ethernet cable attached to the conference station • The inline power patch panel WS-PWR-PANEL is not compatible with the conference station. • To ensure uninterrupted operation of the conference station, make sure that the switch has a backup power supply. • Make sure that the CatOS or IOS version running on your switch supports your intended conference station deployment. Refer to the documentation for your switch for operating system version information. Conference Station Power Consumption and Display Brightness The power consumed by a conference station depends on its power configuration. See Table 2-1 for a power configuration overview. See Table 2-2 for the maximum power consumed by a conference station for each configuration option and the correlating conference station screen brightness level. Note Power consumption values shown in the table include power losses in the cable that connects the conference station to the switch. Table 2-2 Power Consumption and Display Brightness for Power Configurations Power Configuration IEEE 802.3af Class 3 power from a Cisco switch, without bidirectional power negotiation IEEE 802.3af Class 3 power from a third-party switch IEEE 802.3af Class 3 power from a Cisco switch, with bidirectional power negotiation enabled Max. Power Consumed from a Switch 6.3 W 6.3 W 10.25 W Conference Station Screen Brightness Approx. 1/2 Approx. 1/2 Full1 OL-11560-01 Rev. B0 Cisco Unified IP Conference Station 7937 Administration Guide for Cisco Unified Communications Manager 6.0 2-3