recognized by the DFE-528TX auto-negotiation facility, which will switch to those
settings of its own capabilities, which match that of the hub.
Auto-negotiation reoccurs any time the linkage is restored, making the line ready
again for optimal data communications.
About PCI Bus
Your DFE-528TX Adapter delivers outstanding performance by fully exploiting the
advance features of your computer’s PCI bus. DFE-528TX Adapters utilize the Bus
Master Mode of the PCI bus, allowing direct transfers of Ethernet packet content
between computer memory and the adapter’s controller, thus minimizing network
demands on the CPU. The adapter’s controller function provides the additional
benefit of reduced command processing overhead.
The working relationship between a DFE-528TX adapter and main memory,
working in Bus Master mode, is powered by the Bridge/Memory Controller of the
PCI bus. This reduces the CPU role in network operations, thus freeing the CPU to
service other tasks, with resulting improvement in overall computing (multitasking)
performance. At the same time, it produces superior network throughput by
reducing latency (waiting for CPU service) during transmissions and receptions.
Feature
Flow Control
The DFE-528TX implements IEEE 802.3x compliant flow control for full duplex,
which provides traffic management functions for full-duplex operation. Flow
control allows for enhanced full duplex operation with switches. When operating at
full duplex (requiring a direct connection to a switch) and the switch’s data buffer is
about to overflow, a Pause frame will be transmitted to the DFE-528TX. The
ensuing idle time keeps the buffer from overflowing and prevents data from being
lost. This enhancement can improve network throughput, avoid collisions and
prevent lost data, helping the network achieve optimal performance.
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