• 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 5: Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Straight-Through Cable
Crossover Cable
Device
No
Yes
Switch to switch
No
Yes
Switch to hub
Yes
No
Switch to computer or server
Yes
No
Switch to router
Yes
No
Switch to IP phone
2
100BASE-TX and 1000BASE-T traffic requires twisted four-pair, Category 5 or higher. 10BASE-T
traffic can use Category 3 cable or higher.
Cisco Catalyst 9200CX Compact Series Switches Hardware Installation Guide
48
Installing a Compact Switch
Auto-MDIX Connections
