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Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows connecting devices to an Ethernet
Switch's 10/100BaseT(X) port without paying attention to the type of
Ethernet cable being used for the connection. This means that you can
use either a straight-through cable or cross-over cable to connect
devices to the Ethernet Switch.
Auto-Negotiation and Speed Sensing
Each RJ45 Ethernet port independently supports auto-negotiation for
recognizing the transmission speed 10 Mbps or 100 Mbps according to
the IEEE802.3 standard. This means that some of connected Ethernet
devices could operate at 10 Mbps, while at the same time other nodes
are operating at 100 Mbps. Auto-negotiation takes place each time when
a RJ45 cable connection is made and a link will be established. The
Ethernet Switch advertises its capability for using 10 or 100 Mbps
transmission speed to the connected device and expects this also from
the connected device. This procedure results in an agreement to operate
at a speed of either 10 or 100 Mbps.
Auto-Negotiation and Transmission Mode
Besides the transmission speed, each RJ45 port auto-negotiates the
transmission mode (half duplex or full duplex). Typically, if both devices
are set to "auto-negotiation", the full duplex transmission will be set.
Note about possible loss of data packages in case of "Duplex
mismatching"
If the switch's auto-negotiation port is connected to a non-negotiating
device, then the Switch will set its port transmission speed same as the
connected device but is unable to correctly detect the duplex mode. As
result the port is set to the correct speed but is using always the half
duplex mode as required by the IEEE 802.3u standard in such cases. For
correct transmission, the non-negotiating port must be set to half-duplex
mode (speed either 10 Mbps or 100 Mbps).
Specifications
Technology
Standards
Flow Control
Processing Type
Interface
RJ45 Ports
Fiber Ports
LED Indicators
DIP Switches
IEEE 802.3 for 10BaseT,
IEEE 802.3u for 100BaseT(X) and 100Base FX,
IEEE 802.3x for Flow Control
IEEE 802.3x flow control, back pressure flow
control
Store and Forward
10/100BaseT(X) auto negotiation speed, F/H
duplex mode and auto MDI/MDI-X connection
100BaseFX ports (SC/ST connector,
multi/single-mode)
PWR1, PWR2 (Power), 10/100M (TP-Port) and
100M (Fiber port)
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