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Magnum P80F & P80C Personal Switches Installation and User Guide (07/03)
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removed or moved from one segment to another, the P80F and P80C 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 eight 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 P80F or P80C 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 ‘LINK/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 P80F or P80C 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).
4.3 FULL or HALF Duplex, manual selection for P80F Models
Port # 2 or 2SW (the fiber port) has a “F - H” manual switch mounted on the front-left
of the P80F personal Switch. While in the “F” position for fiber, it forces full-duplex mode at
100Mbps. In the “H” position, it forces half-duplex mode. (Note: While fiber port is used, the
copper port # 2 will be automatically disabled.)
4.4 FULL or HALF Duplex, manual selection for P80C Models
Ports # 2 have “FF - A” manual switch mounted on the front-left of the P80C Personal
Switch. While in the “FF” position, it causes 100Mbps fixed full duplex only, which can be
useful for using Fast Ethernet media converter (like Magnum 15E).
While in “A” position, both N-way switch port # 2 support auto-negotiation and full-
duplex mode is advertised for the standard 802.3u auto-negotiation session on RJ-45 switched
ports.