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Dual Speed Functionality & Switching
The TN-5308’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 ToughNet 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 TN-5308 has a MAC 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 TN-5308 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 TN-5308 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 TN-5308’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
TP
(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.
TP
(100M)
GREEN
Off TP port’s 100 Mbps link is inactive.