GarrettCom P62 User Manual
Page 36
Magnum P62-Series Hardened Switches Installation and User Guide (05/05)
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Each time a packet arrives on one of the switched ports, the decision is taken to either
filter or to forward the packet. Packets whose source and destination addresses on the same port
segment will be filtered, constraining them to one port and relieving the rest of the network from
processing them. A packet whose destination address is 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 needed for maintaining the operation of the network (such as occasional multi-cast
packets) are forwarded to all ports.
The Magnum P62-Series Hardened Switch operate 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.
Switching, Address Learning
The Magnum P62-Series units have an address table capacity of 4K node addresses, and
are suitable for use in large networks. They are self-learning, so that as nodes are added or
removed or moved from one segment to another, the P62-Series automatically keeps up with node
locations.
An address-aging algorithm causes least-used addresses to fall out in favor of new
frequently-used addresses. To reset the address buffer, cycle power down-and-up.
4.2
Auto-negotiation and Speed-sensing
All six RJ-45 ports independently support auto-negotiation for speed in 10BASE-T and
100BASE-TX modes. Operation is according to the IEEE 802.3u standard.
When a RJ-45 cable connection is made, and each time a LINK is enabled, auto-
negotiation takes place. The P62-Series advertises its capability for 10 or 100 Mbps speed, and
the device at the other end of the cable should similarly advertise / respond and both sides will
agree to the speed being used. Depending upon the device connected, this will result in
agreement to operate at either 10 Mbps or 100Mbps speed.
When the ‘LK/ACT’ LED is ON, steady ON indicates LINK with no traffic, blinking
ON indicates the port is transmitting / receiving. The port has auto-negotiated for operation. (If a
P62s RJ-45port is connected to a non-negotiating device, it will default to 10 Mbps speed and
half-duplex mode, per the IEEE 802.3u standard).