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Catalyst 3650 Switch Hardware Installation Guide
OL-29734-01
Chapter2 Switch Installation
Connecting Devices to the Ethernet Ports
PoE+ Port Connections
The 10/100/1000 PoE+ ports have the same autonegotiation settings and cabling requirements that are
described in the “10/100/1000 Ethernet Port Connections” section on page 2-19. These ports can provide
PoE or PoE+ inline power.
PoE inline power supports devices compliant with the IEEE802.3af standard, as well as prestandard
Cisco IP Phones and Cisco Aironet Access Points. Each port can deliver up to 15.4 W of PoE.
PoE+ inline power supports devices compliant with the IEEE802.3at standard, by delivering up to 30 W
of PoE+ power per port to all switch ports.
See Table1-12 on page 1-18 for the power supply modules required to support PoE and PoE+ on 24- and
48-port switches.
For more information about the required power-supply module and the PoE specifications, see the
“Power Supply Modules” section on page1-17 and Appendix A, “Technical Specifications.”
Note Many legacy powered devices, including older Cisco IP phones and access points that do not fully
support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.
Caution PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Use
only standard-compliant cabling to connect Cisco prestandard IP Phones, wireless access points, or
IEEE 802.3af-compliant devices to PoE ports. A cable or device that causes a PoE fault must be removed
from the network.
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 361
Table2-1 Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Device Crossover Cable1
1. 100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5, Category 5e, or
Category 6 cable. 10BASE-T traffic can use Category 3 or Category 4 cable.
Straight-Through Cable1
Switch to switch Yes No
Switch to hub Yes No
Switch to computer or server No Yes
Switch to router No Yes
Switch to IP phone No Yes