
Configuring Line Services
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Each 100Base-T port supports 100Base-TX or MII physical interfaces. The
integral 100Base-TX transceiver enables Category 5 twisted-pair wire to be
directly connected to its RJ-45 connector. The MII interface enables external
transceivers to be attached to the MII connector. This allows the use of a variety of
different transmission media, such as Category 3 unshielded twisted-pair wire
(100Base-T4) and fiber-optic (100Base-F) cable.
When using the 100Base-T Link Module, larger packet sizes yield better
performance than smaller packet sizes. In general, you should configure your
application to use the largest packet size possible.
Ethernet Topologies
Thick and thin Ethernet LANs use a bus topology, in which devices connect
directly to the backbone at both the physical and logical levels
(Figure 2-2).
Figure 2-2. Ethernet LAN, Bus Topology
Physically, an Ethernet LAN using twisted-pair cable comprises a string of star
topologies, in which devices connect to a central concentrator
(Figure 2-3).
Logically, however, the cabling still has a bus topology.
Note: To obtain the highest aggregate throughput, use only one of the two
ports on the 100Base-T Link Module. Demanding high throughput from both
ports simultaneously will result in some packet loss and this may decrease the
performance of sensitive applications.
LS0003A
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