Cisco Catalyst 9300 Series Hardware Installation Manual page 61

Installing a Switch
Cisco UPOE+/UPOE uses the same cabling standard as PoE. However, instead of transmitting power over
two of the twisted pairs, it provides the capability to source up to 90 W of power by using all four twisted
pairs of standard Ethernet cabling (Category 5e or higher). To achieve this, it uses two Power Sourcing
Equipment (PSE) controllers to power both the signal pairs and the spare pairs. Cisco UPOE+ guarantees
71.3 W of power to a class 8 Powered Device (PD). The following figure shows the architectural difference
between PoE/PoE+ and Cisco UPOE/UPOE+.
Table 18: PoE/PoE+ and Cisco UPOE/UPOE+ Differences
1
See Power Supply Modules, on page 20
Cisco UPOE/UPOE+ on 24- and 48-port switches.
Warning Voltages that present a shock hazard may exist on Power over Ethernet (PoE) circuits if interconnections are
made using uninsulated exposed metal contacts, conductors, or terminals. Avoid using such interconnection
methods, unless the exposed metal parts are located within a restricted access location and users and service
people who are authorized within the restricted access location are made aware of the hazard. A restricted
access area can be accessed only through the use of a special tool, lock and key or other means of security.
Statement 1072
Warning Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted.
After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the
emergency calling service. In the USA, this emergency number is 911. You need to be aware of the emergency
number in your country. Statement 371
Caution Ethernet twisted pair cables can store high levels of static electricity. Always ground the cables to a suitable
and safe earth ground before connecting them to the switch or other devices.
Signal pair 2
for the power supply modules required to support PoE, PoE+, and
Cisco Catalyst 9300 Series Switches Hardware Installation Guide
PoE+ and Cisco UPOE/UPOE+ Port Connections
Spare pair
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