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Address Learning
The Misumi IESH-MB has an address table that can hold up to 4,000
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, IESH-MB
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
The IESH-MB’s RJ45 Ethernet ports independently support auto-
negotiation for transmission speeds of 10 Mbps, 100 Mbps, and 1000
Mbps, with operation according to the IEEE802.3 standard. This means
that some nodes could be operating at 10 Mbps, while at the same
time, other nodes are operating at 100 Mbps or 1000 Mbps.
When an RJ45 cable is connected, auto-negotiation takes place, and
then each time a LINK is enabled. The IESH-MB advertises its capability
for using 10 Mbps, 100 Mbps, or 1000 Mbps, transmission speeds, with
the device at the other end of the cable expected to advertise similarly.
Depending on what type of device is connected, this will result in
agreement to operate at a speed of 10 Mbps, 100 Mbps, or 1000 Mbps.
If an IESH-MB’s 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 IEEE802.3 standard.
Specifications
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