Twisted-pair Copper Gigabit Server Card
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Gigabit Over Twisted-pair
The DGE-550T offers an inexpensive alternative solution to fiber-optic Gigabit.  Using your existing low-cost Cat. 5 copper twisted-pair wires as the transmission media, this card allows you to instantly upgrade your departmental servers to Gigabit capability without having to install new, expensive fiber cables.

High Performance
Using the bus master mode with direct DMA paths, the DGE-550T provides high throughput between the server host and the card, bypass the host's memory buffer.  The card operates in 32-bit 33MHz PCI bus as well as in the upcoming 64-bit 66MHz PCI bus, auto-configuring according to the different data path widths to guarantee compatibility with various server configurations.  To enhance performance, the card provides large,independent receive/transmit FIFO, jumbo frame support and adaptive Inter-Frame Spacing (IFS) capacity.

Flow Control for Secure Transmission
With IEEE 802.3x flow control support, your server is protected against possible data loss during transmission on the network.  Connected to a Gigabit switch that supports flow control, the card receives signals from the switch regarding buffer overrun during peak usage periods.  When the switch signals a buffer run situation, the card delays transmission until the switch is ready again to accept new data.

Priority Queues
This function allows your server to run Voice over IP (VoIP) telephony, video-conference and other multimedia applications where traffice is queued as critical and non-critical, and network packets are delivered at best-effort speeds.

VLAN to Improve Performance and Security
The card supports IEEE 802.1Q multiple Virtual LAN, allowing you to segment the network to smaller domains to improve performance and security.  Dissemination of broadcast and unnecessary computer-to-computer packets can be restricted to reduce extraneous traffic.  The card provides a VLAN table for the following functions: filtering packets by recognizing VLAN Tags, stripping VLAN Tags on receive, and inserting VLAN Tags on transmit.

Easy Migration Through 10/100/1000Mbps Support
The card supports three network speeds, 10Mbps, 100Mbps and 1000Mbps, allowing you to run in Fast Ethernet now, and migrate to Gigabit anytime later without having to change neither network adapters nor network cables.  The card auto-senses and auto-negotiates to use the best network speed.  Full/half duplex is supported for 10Mbps and 100Mbps, while full duplex is supported for the Gigabit speed.

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