Testing The Cable Connection Of An Ethernet Interface - H3C S10500 Series Interface Configuration Manual

A physical Ethernet interface has eight pins, each of which plays a dedicated role. For example, pins
1 and 2 transmit signals, and pins 3 and 6 receive signals. You can use both crossover and
straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these
types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent
Interface-Crossover (MDIX) modes:
•
MDIX mode—Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.
•
MDI mode—Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.
•
AutoMDIX mode—The interface negotiates pin roles with its peer.
NOTE:
This feature does not take effect on pins 4, 5, 7, and 8 of physical Ethernet interfaces. Pins 4, 5, 7,
and 8 of interfaces operating at 1000 Mbps or higher rates receive and transmit signals.
To enable a copper Ethernet interface to communicate with its peer, set the MDIX mode of the
interface by following these guidelines:
•
Typically, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface
to MDI or MDIX only when the device cannot determine the cable type.
•
When a straight-through cable is used, configure the interface to operate in an MDIX mode
different than its peer.
•
When a crossover cable is used, perform one of the following tasks:
Configure the interface to operate in the same MDIX mode as its peer.
Configure either end to operate in AutoMDIX mode.
To set the MDIX mode of an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface
view.
3. Set the MDIX mode of the
Ethernet interface.

Testing the cable connection of an Ethernet interface

IMPORTANT:
• If the link of an Ethernet interface is up, testing its cable connection will cause the link to go down
and then come up.
• Fiber ports do not support this feature.
This feature tests the cable connection of an Ethernet interface and displays cable test result within 5
seconds. The test result includes the cable's status and some physical parameters. If any fault is
detected, the test result shows the length from the local port to the faulty point.
To test the cable connection of an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface view.
Command
system-view
interface interface-type
interface-number
mdix-mode { automdix | mdi |
mdix }
Command
system-view
interface interface-type interface-number
19
Remarks
N/A
N/A
By default, a copper Ethernet
interface operates in auto mode to
negotiate pin roles with its peer.