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Magnum DS8016 Dual-Speed Stackable Hubs Installation and User Guide (07/06)
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2.2 Product Description - General
Magnum DS8016 Dual-Speed hubs have sixteen RJ-45 ports, each 10/100Mb auto-
sensing *. Each port can independently identify (via IEEE 802.3u auto-sensing) and accept
either 100Mb or 10Mb Ethernet signals, adapting to match the best speed of the connected
device. There are two internal traffic domains in Magnum DS8016 hubs, one for the 100Mb
traffic and one for the 10Mb traffic. The 100Mb users share the 100Mb domain’s bandwidth
and the 10Mb users share the 10Mb domain’s bandwidth.
* Note:
the “special 100Mb-only” model DS8016-E is not dual-speed. See Section 2.2.3 below.
Any DS8016 port can connect into either the 100 or the 10Mb 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 change speed at any
time without impairing the operation of the other ports and connected devices.
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DS8016A
Figure 2.2 a : Magnum DS8016s are functionally both a 10Mb and a 100Mb hub in one
As Magnum DS8016 Dual-Speed units are stacked, the two shared traffic domains
automatically expand to support all of the ports in the stack. Any combination of 10Mb and
100Mb ports, up to the maximum of 48 ports (3 units) in one stack, can be in use at any time.
Some DS8016 models, the Magnum DS8016-B and DS8016-R, include an internal
bridge or switch module which interconnects the 10 Mb and the 100Mb traffic domains. This
enables all users on a DS8016-B or -R hub or a DS8016 stack, whether 100Mb or 10Mb, to
talk to each other. The internal switch of the DS8016’s filters and selectively forwards
packets between the 10Mb and the 100Mb 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 8K node addresses. As networked nodes are
added or removed or move from one speed domain to the other, the DS8016-B’s (or DS8016-
R’s) internal switch automatically keeps track.
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