Black Box 26592 3­ of, Power over Ethernet PoE, Typical Applications, Technically Speaking, Code

LPD100A

LPD101A

Technically Speaking

Power over Ethernet (PoE).

The seemingly universal network connection, twisted-pair Ethernet cable, has another role to play, providing electrical power to low-wattage electrical devices. Power over Ethernet (PoE) was ratified by the Institute of Electrical and Electronic Engineers (IEEE) in June 2000 as the 802.3af-2003 standard. It defines the specifications for low-level power delivery—roughly 13 watts at 48 VDC—over twisted-pair Ethernet cable to PoE-enabled devices

such as IP telephones, wireless access points, Web cameras, and Place silo photo here (on last page).

audio speakers.

Up to 3 photos - all on this page

The way it works is simple: Ethernet cable that meets CAT5

If 4 photos - 2 on this page, two on prior page. (or better) standards consists of four twisted pairs of cable,

and PoE sendsIf 5poweror more,over3theseon lastpairspageto PoEand-enabledthendeviceswork.back.In one method, two wire pairs are used to transmit data,

and the remaining two pairs are used for power. In the other method, power and data are sent over the same pair.

When the same pair is used for both power and data,

the power and data transmissions don’t interfere with each other. Because electricity and data function at opposite ends of the frequency spectrum, they can travel over the same cable.

Electricity has a low frequency of 60 Hz or less, and data transmis- sions have frequencies that can range from 10 million to 100 million Hz.

There are two types of devices involved in PoE configurations:­ Power Sourcing Equipment (PSE) and Powered Devices (PD).

PSEs, which include end-span and mid-span devices, provide power to PDs over the Ethernet cable. An end-span device is often a PoE-enabled network switch that’s designed to supply power directly to the cable from each port. The setup would look some- thing like this:

Amid-span device is inserted between a non-PoE device and the network, and it supplies power from that juncture. Here is a rough schematic of that setup:

Power injectors, a third type of PSE, supply power to a specific point on the network while the other network segments remain without power.

PDs are devices like switches, surveillance cameras, sensors, wireless access points, and any other devices that operate on PoE.

4/16/2010

#26592

Back view: LPD105A

724-746-5500

TYPICAL APPLICATIONS

•Use one set of twisted-pair wires for both data and power.

•Save money by eliminating the need to run electrical wiring.

•Quickly set up a temporary workgroup.

•If your LAN is protected from power failure by a UPS, the PoE PD Switches connected to your LAN are also protected from power failure.

•Use the switch increase the range of your copper network by enabling you to add up to another 100 meters of UTP cabling.

T e c h S P e c s

Standards — IEEE 802.3x, IEEE 802.3u, IEEE 802.3af CE Approval — Yes

Environmental — Operating temperature: +32 to +122° F (0 to +50° C); Storage temperature: -13 to +158° F (-25 to +70° C);

Humidity: 5% to 90% noncondensing Power — Inline PoE Power injector

Size — 1.6"H x 4.8"W x 7.3"D (4.1 x 12.2 x 18.5 cm) Weight — 1.8 lb. (0.8 kg)

blackbox.com

Item	Code
PoE PD Switches
(5) 10/100BASE-T	LPD100A
(4) 10/100BASE-T plus (1) SFP Slot	LPD101A

(3)10/100BASE-T plus

(1)100BASE-SX, Multimode, 850-nm

300 m, ST®	LPD102A
300 m, SC	LPD103A
(3) 10/100BASE-T plus (1) 100BASE-SX, Multimode, 1300-nm
2 km, ST	LPD104A
2 km, SC	LPD105A
(3) 10/100BASE-T plus (1) 100BASE-SX, Single-Mode 1310-nm
40 km, ST	LPD106A
40 km, SC	LPD107A
80 km, ST	LPD108A
80 km, SC	LPD109A
100 km, SC	LPD110A

(3)10/100BASE-T plus

(1)Single-Strand 100BASE-FX, Single-Mode 20 km, SC (Order one of each.)

1310-nm TX/1550-nm RX	LPD111A
1550-nm TX/1310-nm RX	LPD112A
40 km, SC (Order one of each.)	LPD113A
1310-nm TX/1550-nm RX
1550-nm TX/1310-nm RX	LPD114A
60 km, SC (Order one of each.)	LPD115A
1310-nm TX/1550-nm RX
1550-nm TX/1310-nm RX	LPD116A
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