Definition

1000BASE-T (also known as IEEE 802.3ab) is a standard for Gigabit Ethernet over copper wiring. Each 1000BASE-T network segment can be a maximum length of 100 meters (330 feet), and must use Category 5 cable or better. Auto negotiation is a requirement for using 1000BASE-T.

The device performs all physical-layer functions for 1000BASE-T, 100BASE-TX and 10BASE-T Ethernet on standard Category 5 unshielded twisted-pair (UTP) cable. 1000 BASE-T can also run on standard Category 3, 4 and 5 UTP. The BCM54612E is based on the proven digital signal processor (DSP) technology from Broadcom, combining digital adaptive equalizers, ADCs, phase locked loops, line drivers, encoders, decoders, echo cancellers, crosstalk cancellers and all other required support circuitry integrated into a single chip.

Features 

• Single-chip integrated triple-speed Energy Efficient Ethernet Gigabit transceiver. Support for the following copper line interfaces: 1000BASE-T IEEE 802.3ab, 100BASE-TX IEEE 802.3u and 10BASE-T IEEE 802.3
• Supports RGMII MAC interface
• IEEE 802.3az-compliant support — Support for native EEE MACS — support for legacy non-EEE MACs using Autogr EEEn® mode

Application

The third part of an Ethernet network type refers to the cabling used to carry the signals. The earliest forms of Ethernet used coaxial cable, but thin twisted-pair cabling became popular in the mid-1990s. Faster versions of Ethernet also often use fiber optics rather than electrical signals.

1000BASE-TX 

The Telecommunications Industry Association (TIA) created and promoted a standard similar to 1000BASE-T that was simpler to implement, calling it 1000BASE-TX (TIA/EIA-854. The simplified design would have, in theory, reduced the cost of the required electronics by only using two unidirectional pairs in each direction instead of four bidirectional pairs. However, this solution has been a commercial failure, likely due to the required Category 6 cabling and the rapidly falling cost of 1000BASE-T products.

1000BASE-T speed

1000BASE-T is Gigabit Ethernet (1 gigabit is 1000 megabits per second) on copper cables, using four pairs of Category 5 unshielded twisted pair to achieve the gigabit data rate. 1000BASE-T can be used in data centers for server switching, for uplinks from desktop computer switches, or directly to the desktop for broadband applications. A big advantage of 1000BASE-T is that existing copper cabling can be used instead of having to rewire with optical fiber..

Conclusion

All Ethernet twisted-pair technologies are subject to signal impairment. But in the case of 1000BASE-T, these disturbances are cancelled. For example, 1000BASE-T echo cancellation uses established, proven technologies leveraged from telecommunications. In addition, 1000BASE-T cross talk cancellation uses digital signal processing (DSP) technology that has been used by many advanced modems and digital subscriber line (DSL) devices.