Avaya Configuring Ethernet, FDDI, and Token Ring Services Manual de usuario Pagina 27

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Configuring Ethernet Services
305259-A Rev 00
2-3
The following sections describe proprietary features of Bay Networks Fast
Ethernet router services, and provide hints and notes for operation.
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
The connector you use determines the supported features of 100BASE-TX and
100BASE-FX operation (Table 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.
Table 2-2. 100BASE-T Features
Operation Cabling Physical Interface
Automatic Line
Negotiation Full Duplex *
* The current implementation of the Ethernet standard does not address full-duplex operation or congestion control; these
are proprietary features.
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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