ADTRAN 1000R Series full-duplex

Command Reference Guide Ethernet Interface Configuration Command Set

full-duplex

Use the full-duplex command to configure the Ethernet interface for full-duplex operation. This allows the

interface to send and receive simultan eo us ly. Use the no form of this command to return to the default

half-duplex operation.

Syntax Description

No subcommands.

Default Values

By default, all Ethernet interfaces are configured for half- duplex operation.

Applicable Platforms

This command applies to the NetVanta 300, 1000, 1000R, 2000, 3000, 4000, and 5000

and Total Access 900 Series units.

Command History

Release 1.1 Command was introduced.

Functional Notes

Full-duplex Ethernet is a variety of Ethernet technology currently being standardized by the IEEE. Because

there is no official standard, vendors are free to implement their ind ependent versions of full-duplex

operation. Therefore, it is not safe to assume that one vendor’s equipment will work with another.

Devices at each end of a full-duplex link have the ability to send and receive data simultaneously over the

link. Theoretically, this simultaneous action can provide twice the bandwidth of normal (half-duplex)

Ethernet. To deploy full-duplex Ethernet, each end of the link must only connect to a single device (a

worksta tion or a switched hub port). With only two de vices on a full-d uplex lin k, there is n o need to use the

medium access control mechanism (to share the signal channel with multiple stations) and listen for other

transmissions or collisions before sending data.

The 10BaseT, 100BaseTX, and 100BaseFX signalling systems support full-duplex operation (because

they have transmit and receive signal paths that can be simultaneously active).

If the speed is manually set to 10 or 100, the duplex must be manually configured as

full-duplex or half-duplex. Refer to speed [10 | 100 | auto | nonegotiate] on page 645 for

more information.