User Manual

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Switching and Address Learning
EDS-208 has an address table that can hold up to 1,000 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, EDS-208
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 EDS-208’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 a “live” RJ45 cable is connected to
the switch, and then each time a LINK is enabled. EDS-208 advertises
its capability for using either 10 Mbps or 100 Mbps transmission
speeds, with the device at the other end of the cable expected to
similarly advertise. Depending on what type of device is connected, this
will result in agreement to operate at a speed of either 10 Mbps or 100
Mbps.
If an EDS-208 RJ45 Ethernet port is connected to a non-negotiating
device, it will default to 10 Mbps speed and half-duplex mode, as
required by the IEEE 802.3u standard.
Specifications
Technology
Standards
IEEE802.3, 802.3u, 802.3x
Processing Type
Store and Forward, with IEEE802.3x full
duplex, non-blocking flow control
Address Table Size
1,000 uni-cast addresses
Interface
RJ45 Ports 10/100BaseT(X) auto negotiation speed, F/H
duplex mode, and auto MDI/MDI-X
connection
Fiber Ports
100BaseFX ports (SC/ST connector)
LED Indicators
Power, 10/100 M (TP port), 100 M (FX port)
Power
Input Voltage
12 to 48 VDC
Input Current @ 24 VDC
0.07 A (EDS-208)
0.1 A (EDS-208-M-SC/EDS-208-M-ST)
Connection
Removable 3-contact Terminal Block
Overload Current
Protection
Present
Reverse Polarity
Protection
Present
Mechanical
Casing
IP30 protection, plastic case
Dimensions
40 x 109 x 95 mm (W x H x D)