Table of Contents
Advertisement
Magnum DS80 Dual-Speed Personal Hub
"learned" at the same time that the packet is forwarded. After learning, subsequent
packets from the same node address are routinely processed. The address tables are
flushed periodically to update the network status and to purge any inactive stations from
the tables of both domains.
3.
Throughput Increase
By selectively forwarding packets from each domain to the other domain
based on its switching (bridging) logic, the Magnum DS80 increases the available
bandwidth for the users on both sides of the network. As shown in Figure 4.1, it keeps
the local traffic on each side contained, preventing unnecessary packets and bad packets
from traveling to the other domain and using up bandwidth needlessly over there. This
results in more available network bandwidth on both sides and a throughput increase on
for all users on both domains.
4.
Software Transparency
The Magnum DS80 Personal Hubs need no software set-up and are
transparent to system and application software, including network management
software.
4.2
Auto-negotiation and speed-sensing
All eight RJ-45 ports independently support auto-negotiation for shared
10BASE-T and 100BASE-TX modes. Operation is according to the IEEE 802.3u
standard.
When an RJ-45 cable connection is made and each time when a LINK is
enabled, auto-negotiation takes place. The DS80 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 to be used. Depending upon the
device connected, this will result in agreement to operate at either 10 Mbps or 100Mbps
speed.
When the '10 M LINK/ACT' LED is ON, either steady or blinking (see
below), the port has auto-negotiated for 10 Mbps operation. (If a DS80 port is connected
to a non-negotiating device, it will default to 10 Mbps speed and half-duplex mode, per
the IEEE802.3 standard). Similarly, when the '100M LINK/ACT' LED is lit, it means
100Mbps operation Since Magnum DS80s are hubs, they always operate in the shared
or half-duplex mode on all ports.
GARRETT
Installation and User Guide (11/98)
17
Advertisement
Table of Contents
