
Configuring Ethernet Services
117344-A Rev. A 2-3
100BASE-T Media
Each Bay Networks 100BASE-T router port provides two physical connectors for
LAN media:
• Media Dependent Interface (MDI): RJ-45 connector to integral transceiver
• Media Independent Interface (MII): DB-40 connector to an external
transceiver
Which connector you use determines the supported features of 100BASE-TX and
100BASE-FX operation (T
able 2-2).
100BASE-T Packet Size
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.
a. The current implementation of the Ethernet standard does not address full-duplex operation or congestion control; these
are proprietary features.
Table 2-2. 100BASE-T Features
Operation Cabling Physical Interface
Automatic Line
Negotation Full Duplex
a
Congestion
Control *
100BASE-TX
(MDI)
Category 5
unshielded
twisted pair (UTP)
copper
RJ-45 connector Supported Supported Supported
100BASE-FX
(MII)
Multimode
Fiber optic
DB-40 connector to
external transceiver
Not supported Supported Not supported
100BASE-TX
(MII)
UTP DB-40 connector to
external transceiver
Supported Not supported Not supported
Note: To obtain the highest aggregate throughput, use only one port on a
100BASE-T link module. Demanding high throughput from both ports
simultaneously will result in some packet loss, which may decrease the
performance of sensitive applications.
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