SANTA CLARA, Calif. -- National Semiconductor Corp. here today claimed that its new Gigabit Ethernet transceiver is the first triple-speed single-chip solution that is backward compatible with all existing Ethernet infrastructures.
National's DP83891 Gig Phyter combines 10/100/1,000 megabits per second of Ethernet operation on a single chip, making it suitable for switches, workgroups, uplinks, workstations and node cards. Since the Gig Phyter operates over the Category 5 unshielded twisted-pair (UTP) copper wiring that already exists in most office buildings, network administrators can upgrade their Ethernets easily and inexpensively, the company said.
The Gig Phyter chip uses a standard single Quad TX-Transformer interface and performs error-free operations at over 140 meters -- 40 meters greater than IEEE specifications. This ensures the Gigabit technology can be used successfully within an existing 10/100-Mbit/s environment using CAT5 cabling, the company said.
"Today's corporate Ethernets need more bandwidth to satisfy the increasing needs of growing companies," said Gobi R. Padmanabhan, senior vice president and general manager for National's Network Products Group. "Gigabit Ethernets are becoming the solution of choice for LAN backbones, providing the necessary bandwidth as well as easy implementation over existing copper cables. This technology will provide a tenfold increase in performance over the existing Fast Ethernet infrastructure."
The DP83891 is a full-feature physical layer (PHY) transceiver with integrated polarization mode dispersion (PMD) sublayers to support 10BASE-TX, 100BASE-TX and 1000BASE-T Ethernet protocols, and is compliant with IEEE 802.3 specifications. Other features of the Gig Phyter include fully IEEE 802.3u --compliant auto-negotiation at all three speeds. In addition, Gig Phyter possesses an auto-MDIX that automatically detects and corrects wiring problems such as MDI crossover, swapped pairs and reverse polarity. These features give intelligence to correct most common wiring problems.
Gig Phyter combines National's analog and digital signal processing (DSP) technology, and a variety of on-chip circuits to minimize the total cost of the system while increasing the performance. The on-chip circuitry includes adaptive equalization, echo cancellation, cross-talkcancellation, precision analog-to-digital converters, forward error correction and others that allow robust and error-free operation.
The DP83891 Gig Phyter Ethernet transceiver is now available and priced at $95 for quantities of 1,000.