Media Dependent Adapters (MDAs)
The optional expansion slot can be used for a 10/100BASE-TX MDA that supports autonegotiation for either 10 Mb/s or 100 Mb/s operation, depending on the connecting device. For more information about autonegotiation, see “Connecting the 10/100BASE-TX Port” on page 2-9.
The MDA, shown in Figure B-2, provides one 10/100 Mb/s port and its associated LEDs. The LED indicators are described in Table B-2. Because this port is capable of operating at 100 Mb/s, Bay Networks recommends that only Category 5 UTP cabling be used for connections to the RJ-45 port connector (see Table 1-1 on page 1-5 for RJ-45 pin assignments).
The 10/100BASE-TX port also supports operation in full- and half-duplex mode. In full-duplex mode, the aggregate transfer can be either 20 Mb/s or
200 Mb/s (for simultaneous transmit and receive at 100 Mb/s each) depending on the speed of the connecting device. In half-duplex mode, the transfer speed is either 10 Mb/s or 100 Mb/s (transmit or receive).
1 = Status indicators
Link–valid communication link established 100–port operating as 100BASE-TX
F Dx–port operating in full-duplex mode (LED lit) or half-duplex mode (LED off)
2 = 10/100BASE-TX RJ-45 connector
Figure B-2. 10/100BASE-TX MDA
