UDS-2128 New UDS−2113 Series
PC−Communication Analyzers

Product Description

The UDS-2128 and UDS-2123, the world Faster PC-Communication Analyzers are a powerful instruments designed specifically to give you the highest accuracy, measurement speed, and ease-of-use for characterizing both optical and electrical telecommunications and data communications waveforms.
Both instruments are PC-Communication Analyzers, or analyzers for Personal Computer. They require just USB 2.0 (FS) or IEEE1284 (ECP mode) connector in your PC to give you the computing power of a stand-alone instrument within your PC.

Test engineers, production engineers, and systems integrators find that this type of analyzer enables them to quickly create high-throughput test systems (e.g. ATE systems) that are capable of measuring a wide variety of waveforms. For research and design or production test, the analyzers provide right and fast answers on complete characterization of waveforms with automated measurement, and mask testing.

The analyzers use sequential equivalent-time sampling technology to achieve electrical bandwidth up to 20 GHz (12 GHz), while unfiltered optical bandwidth of up to 8 GHz (3 GHz). Data acquisition and measurement analysis are performed in parallel, enabling the instrument to achieve outstanding measurement throughput. The instruments provide fast acquisition, repeatable waveform performance analysis with automated direct or statistical measurements, Markers and Histograms, Math or FFT analysis, high-resolution TDR/TDT, Color-Graded Display, Parametric Limit Testing, and Mask Template Testing. These measurements can be used independently or in concert.

Digital Communications Analysis

The UDS-2128 is designed for communications applications. They provide solutions for design and evaluation of datacomm/telecomm components, transceiver subassemblies, and transmission systems. The UDS-2128 generates measurement results, not just raw data, with time and voltage histograms, mask testing, and statistical pulse parameter measurements. It provides a communications-tailored measurement set that includes jitter, noise, duty cycle, overshoot, undershoot, extinction ratio and amplitude measurements.

The UDS-2128 provides the ideal measurement system for testing low powered SDH/SONET, Fibre Channel and Gigabit Ethernet signals as well as other high-speed telecommunications signals. The calibrated integrated optical receiver, with 8-GHz unfiltered optical bandwidth, allows for easy, precise measurements of optical signals. An average power meter is built-in.

For compliance testing up to three different hardware Bessel-Thomson filters can automatically be switched in to create a calibrated reference receiver. The switchable filter minimizes setup time while maximizing measurement repeatability. Filters have the following data rates – standard: 155.52 Mbps (OC-3/STM-1), 1.25 Gbps (GBE) and 2.488 Gbps (OC-48/STM-16); optional: 622.08 Mbps (OC-12/STM-4), 1063 Mbps (Fc1603), 2.125 Gbps (Fc2125), 2.500 Gbps (Infiniband2.5G), 3.125 Gbps (XAUI).

The diagram below is a block diagram of an optical receiver for the UDS-2128 and UDS2123.

The Block Diagram of Optical Reference Receiver

With the addition of 50 Mbps to 2.7 Gbps internal or external continuous clock recovery trigger, or with the UDX-R01 (622 Mbps, OC12/STM4) and UDX-R02 (2.488 Gbps OC48/STM16) Clock Recovery Heads, reliable parametric testing becomes easy even when you do not have access to a clock signal trigger.

UDS-2128 and UDS-2123 Clock/Data Recovery Trigger System

Same 2.5 Gbps (OC-48/STM-16) signal triggered on a data signal with 20-ps RMS jitter (left), and the more accurate recovered clock signal with less than 11-ps RMS jitter (right)

Eye Diagram Measurements

Accurate eye-diagram analysis for NRZ and RZ signal types is essential for characterizing the quality of electrical and optical transmitters to beyond 10 Gb/s. The UDS-2128 was designed specifically for the complex task of analyzing digital communications waveforms. It quickly measures 38 fundamental parameters used to characterize NRZ signals, also 40 fundamental parameters used to characterize RZ signals. Up to four parameters can be measured simultaneously. Standard measurements include such parameters as Extinction Ratio, Mean rise and fall time, Jitter: p-p and RMS, Crossing %, Eye-width, Eye-height, Overshoot, Duty-cycle-distortion and many others. Very important extinction-ratio measurements are automated with a histogram-based algorithm.

Two examples of 9.7-Gbit (left) and 2.5 Gbps (right) eye diagram measurements

Compliance mask test

The UDS-2128 and UDS-2123 offer a full range of industry standard masks for automated compliance testing. The waveform instantly can be scaled and aligned to the mask. Exceptional measurement speed results in rapid compliance testing. This results in a significantly lower cost per test and gives you a big advantage in overall cost of ownership. Test conditions can be set according to the number of waveforms, number of samples, number of failed waveforms, or number of failed samples. For guard-band testing, margin masks are easily created.

Standard masks available:

SONET/SDH: STM-0, 1, 3, 4, 16, 64/OC-1, 3, 9, 12, 24, 48; and 192.
Fibre Channel: 133, 266, 531, 1063, 2125, 4250, 10518
GB Ethernet: 1250 Mbps, 2.500 Gbps, 9.953 Gbps, 10.3125 Gbps, 12.5 Gbps.

Mask Test and 20-% Margin Test performed for a standard 9.95 Gbps STM64/OC192 eye-diagram

Waveform analysis

In addition to extensive communications waveform analysis, the UDS-2128 and UDS-2123 also perform as a conventional high-speed sampling oscilloscopes, performing accurate Automatic Measurements. They make the measurement process fast and easy, while reducing human errors, particularly essential for repetitive test. All measurements conform to the IEEE standards. Measurements cover Voltage, Timing and FFT.
19 Amplitude Measurements are made on vertical parameters. They typically mean voltage. 15 Timing Measurements are made on horizontal parameters. They typically mean seconds or hertz. 5 FFT Measurements are made on both vertical and horizontal parameters. They typically mean volts and hertz. Such parameters as Maximum, Amplitude, RMS, Overshoot, Period, Frequency, Width, Rise Time, FFT Magnitude, FFT Frequency and many others can be provided.

Limit testing

Signals can be tested by up to four automatic parametric measurements and compared to user-defined test boundaries. Failure tolerances can be selected independently for each of the parametric tests.
Alternatively you can built a limit template from acquired waveforms or download a template from disk. Using a reference waveform method (Automask), masks are constructed by adding a DELTA X and DELTA Y tolerance around a reference waveform. Then the analyzers offer fully automatic pass-fail limit testing. This method is simple to use, though not as flexible as the polygon method.
Limit test can be set to run continuously for a user-selected number of waveforms, or a defined number of failures..


Time and voltage/power histograms may be taken with a user-specified number of samples or waveforms. Time or amplitude histograms are taken within a user-specified vertical and horizontal window. Automatic-histogram measurements include 12 parameters such as Pk – Pk, Median, Mean, Standard Deviation, Mean ± 1 std dev.

The pictures demonstrates of how quickly the UDS-2128 measures all parameters
of vertical histogram (left) and horizontal histogram
for 12-Gbit Eye Diagram

Grey-scaling and Color-grading display

When you select Grey Scaling mode, is assigned a single color. As a persistence data map develops, different intensities of that color are assigned to the range between a minimum and a maximum population.
With Color Grading display style the accumulated points are color graded (shaded with different colors) to indicate the density of the points, and a color-graded database is built. You can use the color-graded database with histograms, mask testing, statistical measurements, and eye diagrams. You can also use color grading to provide more visual information about the waveforms.
Automatic-parametric measurements may be made on both displays allowing evaluation of multi-valued (i.e., eye-diagram) waveforms.

Grey-scaling (left) and Color-grading (right) displays

Waveform math functions

The analyzers support up to four simultaneous mathematical combinations and functional transformation of waveforms that is acquires. You can select any of the math functions as a math operator to act on the operand or operands. A waveform math operator is a math function that requires either one or two sources.
A variety of functions can also be performed on signals: Add, Subtract, Multiply, Divide, Invert, Absolute, Exponent (e), Exponent (10), Logarithm (e), Logarithm (10), Differentiate, Integrate, Inverse FFT, Linear Interpolation, Smoothing, Trend and Sin(x)/x Interpolation.


Up to two fast Fourier transforms can be run simultaneously. To compensates some of the limitations of FFT analysis you can use windowing. The window type defines the bandwidth and shape of the equivalent filter associated with the FFT processing.The analyzers support six types of windows: Rectangular FFT window, which does not taper the time domain data;five tapering FFT windows of different shapes –Hamming, Hanning, Flattop, Blackman-Harris and Kaiser-Bessel windows. Automatic measurements can be made on frequency, delta frequency, magnitude, delta magnitude and THD.

UDS-2128 and UDS-2113
PC-Communication Analyzers

Key specifications

• 20 GHz or 12 GHz Electrical Bandwidth

• 8 GHz or 3 GHz Unfiltered Optical Bandwidth

• Two electrical /One optical channel

• Three Bessel-Thomson filters

• 750 nm to 1650 nm Wavelength range

• DC to 1 GHz Full-function Trigger

• 12-GHz Optional Prescaled Trigger

• Optional Clock Recovery Trigger