Connecting Devices to the Ethernet Ports
10/100/1000/Multigigabit Ethernet Port Connections
The switch 10/100/1000 and Multigigabit Ethernet port configuration changes to operate at the speed of the
attached device. If the attached ports do not support autonegotiation, you can manually set the speed and
duplex parameters. Connecting devices that do not autonegotiate or that have the speed and duplex parameters
manually set can reduce performance or result in no linkage.
To maximize performance, choose one of these methods for configuring the Ethernet ports:
• Let the ports autonegotiate both speed and duplex.
• Set the interface speed and duplex parameters on both ends of the connection.
Auto-MDIX Connections
The autonegotiation and the auto-MDIX features are enabled by default on the switch.
With autonegotiation, the switch port configurations change to operate at the speed of the attached device. If
the attached device does not support autonegotiation, you can manually set the switch interface speed and
duplex parameters.
With auto-MDIX, the switch detects the required cable type for copper Ethernet connections and configures
the interface accordingly.
If auto-MDIX is disabled, use the guidelines in this table to select the correct cable.
Table 9: Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Straight-Through CableCrossover CableDevice
NoYesSwitch to switch
NoYesSwitch to hub
YesNoSwitch to computer or server
YesNoSwitch to router
YesNoSwitch to IP phone
1
100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5 or higher. 10BASE-T
traffic can use Category 3 cable or higher.
PoE and POE+ Port Connections
The 10/100/1000 PoE and PoE+ ports have the same autonegotiation settings and cabling requirements that
are described in the 10/100/1000 Ports, on page 4. These ports can provide PoE and PoE+ inline power.
Cisco Catalyst 9200 Series Switches Hardware Installation Guide
31
Installing the Switch
Connecting Devices to the Ethernet Ports
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