Installation guide

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Dual Speed Functionality & Switching
The EDS-305-M12’s 10/100 Mbps switched M12 ports auto negotiate with the
connected device to use the fastest data transmission rate supported by both
devices. All of Moxa’s EtherDevice switches are plug-and-play devices, so that
software configuration is not required. The half/full duplex mode for the
switched M12 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 and Address Learning
The EDS-305-M12 has an address table that can hold up to 1000 node
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-305-M12 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.
Switching, Filtering, and Forwarding
Each time a packet arrives at one of the switched ports, a decision is made to
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 the other 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-305-M12 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.
LED Indicators
Several LED indicators are located on the EDS-305-M12’s front panel. The
function of each LED is described in the table below.
LED Color State Description
On
Power is being supplied to the power
input.
PWR
AMBER
Off
Power is not being supplied to the power
input.
On TP port’s 10 Mbps link is active.
Blinking Data is being transmitted at 10 Mbps
LNK/ACT
(10M)
AMBER
Off TP port’s 10 Mbps link is inactive.
On TP port’s 100 Mbps link is active
Blinking Data is being transmitted at 100 Mbps.
LNK/ACT
(100M)
GREEN
Off TP port’s 100 Mbps link is inactive.