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Dual-Speed Stackable Hubs User’s Guide
Introduction 3
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LED indicators for power, collisions, link, network activity, switch
capability (DFE-908x only), partitioning status, operating speed (10
or 100 Mbps) and network utilization.
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Auto-partition protection.
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Data collision detection and handling.
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Preamble regeneration, signal retiming.
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Two proprietary daisy-chain ports for cascading up to five hubs to
form one logical hub.
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Uplink port allows easy linking of two Fast Ethernet or four Ethernet
hub stacks to further expand your network.
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Built-in power supply. Automatic voltage selection (100V to 240V,
50 or 60Hz) without fuses to change or a voltage switch to set.
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Stackable to five units, or total 40-port capability.
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Scaleable expansion up to two stacks, or a total of 78 ports.
Dual-speed Fast Ethernet/Ethernet
Hub Technology Overview
Dual-speed Ethernet hubs have been developed to make it simpler to plan
networks containing both 10Mbps Ethernet and 100Mbps Fast Ethernet
technologies, especially when network hosts are being gradually migrated
to new Fast Ethernet connections.
A dual-speed hub is actually two repeaters in one enclosure. The 10Mbps
repeater receives Ethernet transmissions from any of its ports, and retrans-
mits them to all other ports operating at 10Mbps. Similarly, the 100Mbps