1-2
Introduction
Overview
Introduction
Power Over Ethernet connections to embedded computers will allow much
cheaper installation (no AC cabling, lower labor costs), facilitate updating the
installation and repositioning of sensors without electricians, while main-
taining full control over every node through the Internet, with VoIP and
webcam telephony. Functionality can be changed by downloading new soft-
ware through the network.
Figure 1 shows a typical system implemented to power telephones. The PoE
Ethernet switches are installed to supply power over the twisted pair LAN
cables to run phones or other appliances as required.
Figure 1-1. Example of a Typical Implementation
Here are some reasons why you might want to do this:
■ Only one set of wires to bring to your appliance - simplifies installation
and saves space.
■ There is no need to pay for additional electrical power runs or to delay
your installation schedule to make them- saves time and money.
hp procurve
PoE
xl module
J8161A
xl
module
PoE
Link
Mode
1
2
3
4
56
PoE-Ready 10/100-TX Ports (1-24) all ports are HP Auto-MDIX
13
14
20
19121110
9
8
7
15
21
16
22 23 24
17 18
Std
PoE
PoE
EPS
Status
LED Mode
Mode
Link
hp procurve
PoE
xl module
J8161A
xl
module
PoE
Link
Mode
1
2
3
4
56
PoE-Ready 10/100-TX Ports (1-24) all ports are HP Auto-MDIX
13
14
20
19121110
9
8
7
15
21
16
22 23 24
17 18
Std
PoE
PoE
EPS
Status
LED Mode
Mode
Link
hp procurve
PoE
xl module
J8161A
xl
module
PoE
Link
Mode
1
2
3
4
56
PoE-Ready 10/100-TX Ports (1-24) all ports are HP Auto-MDIX
13
14
20
19121110
9
8
7
15
21
16
22 23 24
17 18
Std
PoE
PoE
EPS
Status
LED Mode
Mode
Link
hp procurve
PoE
xl module
J8161A
xl
module
PoE
Link
Mode
1
2
3
4
56
PoE-Ready 10/100-TX Ports (1-24) all ports are HP Auto-MDIX
13
14
20
19121110
9
8
7
15
21
16
22 23 24
17 18
Std
PoE
PoE
EPS
Status
LED Mode
Mode
Link
HP 610
HP 5300xl
Mitel 3300
IP PBX
HP PoE Switch
HP PoE Switch
HP 600
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