User Manual

- 14 -
Blinking
Data is being transmitted at 100 Mbps.
Off
100Base TP/FX Port’s link is inactive.
Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows users to connect the EDS’s
10/100BaseTX ports to any kind of Ethernet device, without needing to
pay 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 the EDS to Ethernet devices.
Dual Speed Functionality and Switching
The Moxa EtherDevice Switch’s 10/100 Mbps switched RJ45 port auto
negotiates with the connected device for the fastest data transmission
rate supported by both devices. All models of Moxa EtherDevice Switch
are plug-and-play devices, so that software configuration is not
required at installation, or during maintenance. The half/full duplex
mode for the switched RJ45 ports is user dependent and changes (by
auto-negotiation) to full or half duplex, depending on which
transmission speed is supported by the attached device.
Switching, Filtering, and Forwarding
Each time a packet arrives at one of the switched ports, a decision is
made to either filter or forward the packet. Packets with source and
destination addresses belonging to the same port segment will be
filtered, constraining those packets to one port, and relieving the rest of
the network from the need to process them. A packet with destination
address on another port segment will be forwarded to the appropriate
port, and will not be sent to ports where it is not needed. Packets that
are used in maintaining the operation of the network (such as the
occasional multi-cast packet) are forwarded to all ports. The EDS
operates in the store-and-forward switching mode, which eliminates
bad packets and enables peak performance to be achieved when there
is heavy traffic on the network.
Switching and Address Learning
The EDS has an address table that can hold up to 1024 addresses,
which makes it suitable for use with large networks. The address tables
are self-learning, so that as nodes are added or removed, or moved
from one segment to another, the EDS automatically keeps up with new
node locations. An address-aging algorithm causes the least-used
addresses to be deleted in favor of newer, more frequently used
addresses. To reset the address buffer, power down the unit and then
power it back up.
Auto-Negotiation and Speed Sensing
All of the EDS’s RJ45 Ethernet ports independently support auto-
negotiation for speeds in the 10BaseT and 100BaseTX modes, with
operation according to the IEEE 802.3u standard. This means that
some nodes could be operating at 10 Mbps, while at the same time,
other nodes are operating at 100 Mbps. Auto-negotiation takes place
when an RJ45 cable connection is made, and then each time a LINK is
enabled. The EDS advertises its capability for using either 10 Mbps or