Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (12/01)
addresses, and is 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 DS80F and DS80C 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.
4.2Auto-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 when a LINK is enabled, auto- negotiation takes place. The DS80F or DS80C advertises it 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 10Mbps 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 DS80F or DS80C RJ-45port is connected to a non-negotiating device, it will default to 10Mbps speed and half-duplex mode, per the IEEE 802.3u standard).
4.3Full or Half - Duplex, manual switch selection for DS80F Models
Ports 1SW and 2SW (the switched ports) have a common “F - H” manual switch mounted on the front-left of the DS80F personal hub. While in the “F” position, it causes full- duplex mode to be advertised for the standard 802.3u auto-negotiation session on RJ-45 ports 1SW. For fiber, it forces full-duplex mode at 100Mbps. In the “H” position, it causes half- duplex mode to be advertised for auto-negotiation on port 1SW, and for fiber it forces half- duplex mode.
4.4Full Fixed or Auto-Negotiation, manual switch selection for DS80C Models
Port 2SW have a “FF - A” manual switch mounted on the front-left of the DS80C Personal Hub. While in the “FF” position, it causes full-duplex mode to be advertised for the standard 802.3u auto-negotiation session on RJ-45 port 1SW, but for switch 2SW, it causes 100Mbps fixed full duplex, only which can be useful for using Fast Ethernet media converter (like Magnum 15E).
While in “A” position, the switched port 2SW is set at 10/100 auto-negotiation, that allow this switched port to connect at 100Mb Full-duplex with any other auto-negotiating Switches.
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