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C2626M (2/07) 11
Using the TX Mode switch for a particular port, you can do the following:
• Enable autonegotiation or select (force) a specific data rate and duplex mode:
– Enabling autonegotiation allows the SX8205R module to automatically negotiate with
the device to which the port is connected for data rate and duplex modes of operation:
10 Mbps or 100 Mbps data rate and half-duplex or full-duplex mode. The highest
common denominator of operational modes is automatically selected.
Autonegotiation is enabled by default.
– If autonegotiation is not desired, you can select a specific data rate and duplex mode:
• Data rate configuration allows you to select 10 Mbps or 100 Mbps.
• Duplex mode configuration allows you to select half-duplex mode or full-duplex
mode.
• Enable or disable flow control. Flow control controls data transmission at the sending device
to avoid overfilling buffers and losing data at the receiving device. When the buffers on the
receiving device are full, a message is sent to the sending device to suspend the transmission
until the data in the buffers has been processed.
NOTE: For time-sensitive data applications (for example, video and audio applications), it is
recommended that flow control be disabled.
Flow control is disabled by default.
With the SX8205R module powered off, set each TX Mode switch to the desired modes of operation.
Refer to Table A for TX Mode switch settings and corresponding 10BASE-T/100BASE-TX port modes
of operation. Note that each 10BASE-T/100BASE-TX port operates independently of one another;
therefore, each port can be set to different modes of operation as appropriate.
Table A. TX Mode Switch Settings
TX Mode
Switch Position 10BASE-T/100BASE-TX Modes of Operation
0 Auto Neg/Dis FC: Enables autonegotiation between 10 Mbps and
100 Mbps and between half-duplex and full-duplex modes, disables
flow control (default setting)
1 100 FD/Dis FC: Selects 100 Mbps full-duplex, disables flow control
2 100 HD/DIS FC: Selects 100 Mbps half-duplex, disables flow control
3 10 FD/Dis FC: Selects 10 Mbps full-duplex, disables flow control
4 10 HD/Dis FC: Selects 10 Mbps half-duplex, disables flow control
5 Auto Neg/En FC: Enables autonegotiation between 10 and 100 Mbps
and between half-duplex and full-duplex modes, enables flow control
6 100 FD/En FC: Selects 100 Mbps full-duplex, enables flow control
7 100 HD/En FC: Selects 100 Mbps half-duplex, enables flow control
8 10 FD/En FC: Selects 10 Mbps full-duplex, enables flow control
9 10 HD/En FC: Selects 10 Mbps half-duplex, enables flow control
NOTE: Switch positions 0-4 disable flow control. Positions 5-9 enable flow control.