100M/1G/2.5G/5G/10G Ethernet Port Connections; Poe+ Port And Cisco Upoe Connections - Cisco Catalyst 3650 Series Hardware Installation Manual
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Connecting a Device to an Ethernet Port
The autonegotiation feature is enabled by default on the switch. In this setting, the switch ports configure
themselves to operate at the speed of the attached device. If the attached device does not support
autonegotiation, you can explicitly set the switch port speed and duplex parameters. To maximize
performance, either let the ports autonegotiate both speed and duplex, or set the port speed and duplex
parameters on both ends of the connection.
For simplified cabling, the automatic medium-dependent interface crossover (auto-MDIX) feature is
enabled by default on the switch. With auto-MDIX enabled, the switch detects the required cable type
for copper Ethernet connections and configures the interface accordingly. Therefore, you can use either
a crossover or a straight-through cable for connections to a 10/100/1000 Ethernet port regardless of the
type of device at the other end of the connection.
See the switch's software configuration guide or the switch command reference document on Cisco.com
for more information about enabling or disabling autonegotiation and auto-MDIX.
If auto-MDIX is disabled, use the guidelines in
switch 10/100/1000 Ethernet ports to other devices.
Table 2-1
Device
Switch to switch
Switch to hub
Switch to computer or server
Switch to router
Switch to IP phone
1. 100BASE-TX and 1000BASE-T traffic requires a twisted four-pair, Category 5, Category 5e, or
100M/1G/2.5G/5G/10G Ethernet Port Connections
The 100M/1G/2.5G/5G/10G Ethernet ports use RJ45 connectors with Ethernet pinouts. These ports do
not support 10 Mbps speed. The 100 Mbps and 1 Gbps traffic require a Category 5/5e/6 unshielded
twisted pair (UTP) cable at a maximum cable length of 100 m. The 2.5 Gbps traffic requires a Category
5e/6/6a UTP cable at a maximum cable length of 100 m. The 5 Gbps traffic requires a Category 5e UTP
cable at a maximum cable length of 70 m and a Category 6/6a UTP cable at a maximum cable length of
100 m. The 10 Gbps traffic requires a Category 6 UTP cable at maximum cable length of 55 m and a
Category 6a UTP cable at maximum cable length of 100 m.
PoE+ Port and Cisco UPOE Connections
The 10/100/1000 PoE+ and Cisco UPOE ports have the same autonegotiation settings and cabling
requirements that are described in the
These ports can provide PoE or PoE+ inline power.
PoE inline power supports devices compliant with the IEEE 802.3af 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 that are compliant with the IEEE 802.3at standard, by delivering up
to 30 W of PoE+ power per port to all the switch ports.
Cisco UPOE ports provide up to 60 W power per port for connected devices.
Catalyst 3650 Switch Hardware Installation Guide
2-20
Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Category 6 cable. 10BASE-T traffic can use a Category 3 or Category 4 cable.
Table 2-1
to select the correct cable for connecting the
1
Crossover Cable
Straight-Through Cable
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
"10/100/1000 Ethernet Port Connections" section on page
Chapter 2
Switch Installation
1
2-19.
OL-29734-01
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