Moxa EDS-305-M-SC [15/16] Auto negotiation and speed sensing
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Moxa EDS-305-M-SC [15/16] Auto negotiation and speed sensing

Moxa EDS-305-M-ST [15/16] Auto negotiation and speed sensing
- 15 -
Switching and Address Learning
The EDS has an address table that can hold up to 1K 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 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 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 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
Forward and Filtering
Rate
148810 pps
Packet Buffer Memory
256 KB
Processing Type
Store and Forward, with IEEE802.3x full duplex,
back pressure flow control
Address Table Size
1K uni-cast addresses
Latency
Less than 5 μs
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, Fault, 10/100
DIP Switch
Port break alarm mask
Alarm Contact One relay output with current carrying capacity
of 1A @ 24 VDC
Optical Fiber
Multi
mode
Single
mode, 15
Single
mode, 40
Single
mode, 80
Distance, km
5
15
40
80
Wavelength, nm
1300
1310
1310
1550
Min. TX Output, dBm
-20
-15
-5
-5
Max. TX Output, dBm
-14
-6
0
0
Sensitivity, dBm
-34 to -30
-36 to -32
-36 to -32
-36 to -32

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