ICP DAS USA TDRS4050601 - Manual (Page 27)

Industrial Redundant Ring Switch – RS Series User Manual
TDRS4050601 19
Connecting Ethernet Ports
RS Series includes all RJ-45 ports with automatic MDI/MDI-X crossover, and automatic
10/100Mbps data rate sensing for 10Base-T or 100Base-TX connections. Automatic
MDI/MDI-X crossover allows you to connect to other switches, hubs, or workstations,
without regard to using straight-through or crossover cabling. The following figures depict
the schematic diagram of straight-through and crossover cabling. Note that crossover
cables simply cross-connect the transmit lines at each end to the receive lines at the
opposite end.
Straight-through Cabling Schematic Crossover Cabling Schematic
Note that Ethernet cables use pins 1, 2, 3, and 6 of an 8-pin RJ45 connector. The signals
of these pins are converted by the automatic MDI-X function, as shown in the table
below:
Connect one side of an Ethernet cable into any switch port and connect the other side to
your attached device. The green LNK LED will light up when the cable is correctly
connected. Always make sure that the cables between the switches and attached devices
(e.g. switch, hub, or workstation) are less than 100 meters (328 feet).
Two switches are now up-linked together. If we change the up-link port manually at this
time, the MAC address table will change as well. After the MAC address table changes,
then the data can be transmitted between these two switches. This period of time is
called the MAC address table aging time. The switch‟s default aging time is 5 minutes,
which means that if you manually change the up-link port, you will need to wait up to 5
minutes before the data can be sent. If the aging time is too short, the MAC address table
will constantly refresh, resulting in excess consumption of switch computing resources.
For this reason, a longer aging time is recommended.