Matrox 4Sight User Manual page 36

36 Chapter 2: Connecting and configuring external peripherals to the unit
Communication
modes
The communication mode for an Ethernet interface defines how
it adapts its settings when connected to another Ethernet
interface. Supported modes are:
Auto sense mode: In this mode, the local Ethernet interface
advertises its best communication mode, which is 100 Mbits
in full duplex, but is controlled by its link partner (Slave). If
its link partner is in auto sense mode Matrox 4Sight will
adapt its communication mode (both speed and duplex)
according to the link information it receives from the link
partner. The Ethernet interface will adapt to its partner such
that the maximum rate of communication is reached.
However, if the link partner is in forced mode, the Ethernet
interface will use a parallel detection algorithm that is only
capable of determining the speed of the link. The duplex mode
will be set to half, by default.
Advertised mode
controller is in control of the speed and duplex mode of
communication (Master). It will communicate its settings to
its link partner and alter the partner's communication mode
to maximize communication rate if the link partner is in auto
sense mode. If the link partner is in forced mode, the ethernet
controller will enter into a parallel detection algorithm that
is only capable of determining the speed of the link. The
duplex mode will be set to half, by default.
Forced mode: In this mode, you set the local Ethernet
interface options (speed and duplex mode) and these options
do not change regardless of environment.
To avoid problems when connecting two Ethernet interfaces,
the communication modes of the interfaces must match, that is
their speed and duplex modes must be the same. For successful
peer-to-peer communication both computers must have
matching duplex modes. Unmatched modes will result in a very
low bandwidth and poor communication. This means that the
interfaces must both be in full auto sense mode, or they must
both operate at the same speed and duplex mode.
1. The Advertised Mode is not currently supported on Matrox
4Sight units that have an Intel Ethernet controller.
1
: In this mode, the local Ethernet