Planning a Switched Network
2-10
893-878-B
Link Speeds
Use the 10Mb/s ports and the 100 Mb/s MDA ports to connect to 10 Mb/s and
100 Mb/s devices. Using the 100BASE-T MDA ports in full-duplex mode
achieves the greatest aggregate throughput of the Model 58000 switch, and
provides for greater distances between hubs.
Avoid using 10 Mb/s links between connected Model 58000 switches because
10BASE-T operates at 10 Mb/s half-duplex or full-duplex mode and does not
provide sufficient bandwidth for high-speed switched connections. When used,
10 Mb/s trunk link connections result in greatly diminished throughput along
the link.
Full-duplex Operation
Model 58000 switches support full-duplex mode for MDA ports operating at
100 Mb/s. For full-duplex mode, the CSMA/CD protocol is turned off and
frame transmissions occur in both directions along the link at the same time,
which increases the total bandwidth of the trunk link to 200 Mb/s and allows
link distances to be greater between switches. Full-duplex mode can be used on
links between the following devices:
•
Two Model 58000 switches that are connected using 100 Mb/s MDA ports
•
A Model 58000 switch and an end station (if the Ethernet end station
supports full-duplex operation)
The 16 10BASE-T ports on the front of the Model 58000 switch module also
support full-duplex mode when they are connected to external devices from the
front of the switch. The first 12 of these 10BASE-T ports can connect to the
backplane at half-duplex mode only.
NOTE:
Unless specifically configured for full-duplex operation, the
100BASE-T MDA ports and the 10BASE-T front panel connected ports default
to half-duplex mode. You can configure each port for either half- or full-duplex
operation using the service port screens. For instructions on how to configure
ports, refer to
, “Configuring the Model 58000 Switch.”
893-878-B Book Page 10 Monday, May 12, 1997 2:06 PM
Summary of Contents for 58000
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