Relevant Documents


The testing of Ethernet-based devices – supporting the 10Base-T, 100Base-TX, and 1000Base-T standards – is defined in the IEEE 802.3-2005 and ANSI X3.263-1995 standards.

Support for four test modes is required in the physical layer of the device-under-test (DUT). A disturbing sine wave is required for modes 1 and 4. The frequency and amplitude of the sine wave specified for each mode are listed in the following table:


Figure 1: Gigabit Ethernet Tests and Modes

An important prerequisite for testing is disturber calibration, in which we measure the amplitude of a disturbing sine wave being applied to the DUT. The calibration is required to adjust the amplitude of the disturbing sine wave, which is generated by a dual-channel arbitrary waveform generator (AWG).



The testing modes requiring use of a disturbing signal are detailed below. Note that the two output signals generated by the AWG must have the same amplitude, but are generated with a 180-degree phase shift.

Mode 1 Disturbing Signal


Mode 4 Disturbing Signal



Tabor Electronics’ Wave Standard family of Arbitrary Function Generators (AFGs) serves as an excellent platform for Ethernet Disturber Calibration, with dual-channel waveform generation capability, and a sampling rate of 250 MS/second.

Wave Standard incorporates both a built in waveform gallery and modulation schemes for easy and fast generation of standard waveforms, as well as a memory-based true AWG architecture that allows you to quickly create and edit complex waveforms.

Wave Standard is supplied with ArbConnection – Tabor’s comprehensive software tool that controls AWG operation, and supports the creation of unique, arbitrary waveforms using its powerful Waveform Composer.


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