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4.2. Port Configuration
4.2.1.
Port Settings
Introduction
State
In port configuration you can enable or disable the port. If the port is
disabled the port remains off without any operation. To keep it operating, place the
port in enable state.
Speed
It defines in which speed the port should operate. The speeds that it can
operate are 10/100/1000Mbps. You can also specify whether the port should operate
in what mode. The operating modes are half duplex and full duplex.
Duplex Mode
A duplex communication system is a system composed of two connected parties or
devices that can communicate with one another in both directions.
Half Duplex:
A half-duplex system provides for communication in both directions, but only one
direction at a time (not simultaneously). Typically, once a party begins receiving a signal,
it must wait for the transmitter to stop transmitting, before replying.
Full Duplex:
A full-duplex, or sometimes double-duplex system, allows communication in both
directions, and, unlike half-duplex, allows this to happen simultaneously. Land-line
telephone networks are full-duplex, since they allow both callers to speak and be heard at
the same time.
Loopback Test
A loopback test is a test in which a signal in sent from a communications device and
returned (looped back) to it as a way to determine whether the device is working right or
as a way to pin down a failing node in a network. One type of loopback test is performed
using a special plug, called a wrap plug that is inserted in a port on a communications
device. The effect of a wrap plug is to cause transmitted (output) data to be returned as
received (input) data, simulating a complete communications circuit using a single
computer.
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