Alcatel OS6850-48 Guide de l'utilisateur télécharger pdf (Page 119)

OmniSwitch 6850 Series Hardware Users Guide April 2010 page 3-1

3 Installing and Managing

Power over Ethernet (PoE)

Power over Ethernet (PoE) is supported on OmniSwitch 6850 Series switches and provides inline power

directly from the switch’s Ethernet. Powered Devices (PDs) such as IP phones, wireless LAN stations,

Ethernet hubs, and other access points can be plugged directly into the Ethernet. From these RJ-45 the

devices receive both electrical power and data flow.

As the feature reduces devices’ dependence on conventional power sources, PoE eliminates many restric-

tions that traditional electrical considerations have imposed on networks.

In a PoE configuration, Power Source Equipment (PSE) detects the presence of a PD and provides an elec-

trical current that is conducted along the data cable. The PD operates using the power received via the

Ethernet data cable; no connection to an additional power source (e.g., an AC wall socket) is required.

Note on Terminology. There are several general terms used to describe the feature, PoE. The terms Power

over Ethernet (PoE), Power over LAN (PoL), Power on LAN (PoL), and Inline Power are synonymous

terms used to describe the powering of attached devices via Ethernet. For consistency, this chapter and the

CLI Command Reference Guide refer to the feature as Power over Ethernet (PoE).

Additional terms, such as Powered Device (PD) and Power Source Equipment (PSE) are not synonymous

with PoE, but are directly related to the feature:

• PD refers to any attached device that uses a PoE data cable as its only source of power. Examples

include access points, such as IP telephones, Ethernet hubs, wireless LAN stations, etc.

• PSE refers to power sourcing equipment, which provides power to a single link section. PSE main

functions include searching the PD, optionally classifying the PD, supplying power to the link section

only if the PD is detected, monitoring the power on the link section, and scaling power back to detect

level when power is no longer requested or required.

As the OmniSwitch 6850 Series switches fully support 10/100/1000 Ethernet connectivity, you may also

attach non-PD equipment, such as computer workstations, printers, servers, etc. to the PoE. See Chapter 2,

“OmniSwitch 6850 Series Chassis and Hardware Components,” for more information on the OmniSwitch

6850 Series chassis.

Important. Alcatel-Lucent recommends that PoE-enabled switches with attached IP telephones should

have operational power supply redundancy at all times for 911 emergency requirements. In addition, both

the switch and the power supply should be plugged into an Uninterruptible Power Source (UPS).

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Alcatel OS6850-48 Guide de l'utilisateur Page 119