10/100/1000 Ethernet Port Connections; 100M/1G/2.5G/5G/10G Ethernet Port Connections; Poe+ Port And Cisco Upoe™ Connections - Cisco Catalyst 3650 Hardware Installation Manual

Connecting Devices to the Ethernet Ports

10/100/1000 Ethernet Port Connections

The 10/100/1000 Ethernet ports use RJ-45 connectors with Ethernet pinouts. The maximum cable length
is 328 feet (100 meters). The 100BASE-TX and 1000BASE-T traffic requires Category 5, Category 5e,
or Category 6 UTP cable. The 10BASE-T traffic can use Category 3 or Category 4 cable.
The autonegotiation feature is enabled by default on the switch. At this setting, the switch ports
configure themselves to operate at the speed of 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 switch 10/100/1000 Ethernet port regardless
of the type of device on the other end of the connection.
See the switch software configuration guide or the switch command reference 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 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 10Mbps speed. The 100M and 1G traffic requires Category 5/5e/6 unshielded twisted pair
(UTP) cable at maximum cable length of 100 meters. The 2.5G traffic requires Category 5e/6/6a UTP
cable at maximum cable length of 100 meters. The 5G traffic requires Category 5e UTP cable at
maximum cable length of 70 meters and Category 6/6a UTP cable at maximum cable length of 100
meters. The 10G traffic requires Category 6 UTP cable at maximum cable length of 55 meters and
Category 6a UTP cable at maximum cable length of 100 meters.
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.
Catalyst 3650 Switch Hardware Installation Guide
2-20
Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Category 6 cable. 10BASE-T traffic can use 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
2-20.
OL-29734-01