Magnum DS80 Dual-Speed Personal Hub Installation and User Guide (11/98)
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2.2
Product Description - General
Magnum DS80 Dual-Speed hubs have eight RJ-45 ports, each 10/100Mbps
auto-sensing. Each port can independently identify (via IEEE 802.3u auto-sensing) and
accept either 100Mbps or 10 Mbps Ethernet signals, adapting to match the best speed of
the connected device. There are two internal traffic domains in Magnum DS80 hubs,
one for the 100Mbps traffic and one for the 10 Mbps traffic. The 100Mbps users share
the 100Mbps domain’s bandwidth and the 10 Mbps users share the 10 Mbps domain’s
bandwidth.
Figure 2.2.1 : Magnum DS80 is functionally both a 10 Mbps and a 100Mbps hub
in one
The Magnum DS80 includes an internal bridge or switch I.C. (Integrated
Circuit) which interconnects the 10 Mbps and the 100Mbps traffic domains. This
enables all users on a DS80 hub, whether 100Mbps or 10Mbps, to talk to each other.
The internal switch of the DS80 filters and selectively forwards packets between the 10
Mbps and the 100Mbps domains, maintaining peak performance in each domain
unaffected by local traffic in the other domain. The internal bridge is self-learning, with
large address table capacity for up to 1.8K node addresses. As networked nodes are
added or removed or move from one speed domain to the other, the DS80’s internal
switch automatically keeps track.
Figure 2.2.2 : DS80 with a
switch chip built-in for 10 to
100 bridging
Any DS80 port can connect into either the 100 or the 10 Mbps traffic domain,
and can also change from one traffic domain to the other at any time without affecting
the speed of other ports. The automatic per-port speed-sensing is continuous (it takes
place at LINK enable, see Section 4.2 for details), allowing the connected devices to
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