Telebyte offers the only crosstalk emulator for testing VDSL2 Vectoring equipment. The global xDSL equipment supplier is a leading designer and manufacturer of local loop simulators (wireline simulators) and interference simulators (noise generators) for physical-layer  testing of xDSL equipment used for G.SHDSL, ADSL2+, VDSL, VDSL2, WT-249, TR-249, G.991.2, TR-114, TR-100, testing and more. Applications include testing for: interoperability, bonding, vectoring performance, rate/reach, production, R&D laboratory and more.

Highlights

• Suitable for VDSL2 Vectoring test cases
• 48 independent loops
• 3 selectable loop line lengths per channel
• FEXT emulation between all loops
• Symmetrical crosstalk matrix
• Micro-Interruptions
• Efficient automation
• Repeatable testing
• Ideal for parallel testing
• Remote control via Ethernet, RS-232, USB or User-friendly GUI

VDSL2 Vectoring technology promises to bring a wealth of new opportunities to Service Providers as well as manufacturers of DSLAMs, CPE Modems and Chipsets. This exciting new technology allows for a more efficient utilization of existing copper infrastructure by cancelling the crosstalk between neighboring pairs within a cable. This increases data rates far beyond current levels, making bandwidth-intensive applications such as IPTV and Triple Play available in areas where it was not possible before.  

Bringing products and services based on Vectoring technology to the marketplace requires repeatable testing of multiple loops. Until now, breakthroughs in this technology have not been matched by innovations in commercially available testing solutions. The only choices have been Cable Farms where correlating test results from site to site is problematic.

Telebyte’s xTalk Emulator is the world’s first commercially available solution for physical layer testing of equipment that utilizes VDSL2 Vectoring technology. The VxT-48 offers repeatable and configurable Vectoring performance testing of up to 48 independent loops in one complete unit. Multiple units are ideal for parallel testing to ensure consistent performance from site to site. Our groundbreaking design emulates FEXT between three loop lengths on up to 48 channels.

Emulation

The VxT-48-DC emulates the symmetric model of the ATIS Multiple-Input Multiple-Output (NIPP-NAI-2009-014R3) on 48 channels (using the upper-left 48 x 48 quadrant of the 100 x 100 random-drawn matrix). It also models crosstalk between xDSL multi-pairs within a cable binder and is sufficient for automatically running test cases for systems with Vectoring capabilities. The simulation accuracy is principally focused on the attenuation of the direct and crosstalk paths rather than the phase/delays.

The crosstalk channel transfer function accuracy is based on FEC coupling transfer function as defined in ATIS-PP-0600024_MIMO_Channel_Model_NIPP-NAI-2009-014R3 with the random drawn matrix for amplitude offset.

The coupling between the pairs is realized using fixed coupling elements between pair [i] and pair [j] for [i],[j] = 1,..,48. The VxT-48 provides independent control of 48 channels. The line section emulates the insertion loss of the following loops:

The Model VxT-N48 48-Channel AWGN Generator/Injector is designed to interface between CO or CPE equipment and the Telebyte VxT-48  xTalk Emulator for VDSL2 Vectoring Testing. Operating in three modes, it will generate 48 channels of built-in, uncorrelated AWGN as well as inject up to 48 correlated or uncorrelated complex noises received from the Model 4901 Multi-Output Noise Simulator. The VxT-N48 accepts two SMB inputs per channel from the Model 4901 for easy combining of RFI, alien crosstalk, impulse and other noises for complex test scenarios on each channel. Two additional SMB’s are provided for combining two 4901 outputs and then distributing them noise across all enabled channels. 

The front of the unit has two rows of twelve TERA connectors. Each of these connectors can connect to four line-pairs via a Category-7 cable. One row connects to the VxT-48 via short jumpers, while the other connects to the CO or CPE equipment. If the user wishes to add noise to both the CO and CPE sides of the test set up, two units should be purchased

Shown above is a rear view of the VxT-N48 revealing 98 SMB connectors (96 for independent noise, 2 for distributed noise). Also shown are the RS-232, Ethernet and IEEE-488 connectors. Control is available through the front panel, remote commands or the VxT-48 Control Center software

The VxT-N48 (top unit) is shown connected via 12 short Category-7 jumper cables to the VxT-48 xTalk Emulator for VDSL2 Vectoring Testing (bottom unit). Another VxT-N48 may be placed below the Emulator (in a rack) for injection on the other side of the loop. This product may also be used with Telebyte’s local loop simulators.

Offering the only fully-compliant TR-114 solution in the industry.

The 4901-PC-HD High-Density version provides 2 to 32 independent noise channels in a 4U-high industrial PC. The modular system holds up to 8 (2 or 4-port) AWG cards and can be expanded by adding more AWG cards, noise injectors and other components as needed. 

The 4901-PC-Compact version provides 2 to 8 independent noise channels in a small form factor. The modular system holds up to 2 (2 or 4-port) AWG cards.

The 4901-PC-Portable version provides 2 to 8 independent noise channels in a portable, handheld unit. The modular system includes a built-in display and holds up to 2 (2 or 4-port) AWG cards. 

A user-friendly configuration software allows the user to select and build impairment models common to DSL network implementations. A wide variety of custom crosstalks (including ADSL2+ and VDSL2) as well as impulse noises (such as REIN, SHINE and PEIN) can be created. In addition, user-defined files in several formats (such as MATLAB and Excel) may be imported. Optional noise modules automatically setup standards-based testing for TR-114, TR-100, G.SHDSL and more.

Highlights

• Bandwidth 20 kHz to 30 MHz

• Crest Factor greater than 5
• High degree of accuracy
• Noise Floor less than -145 dBm/Hz (as measured at the output of the noise injector)
• Expandable, modular design. High-density version holds up to 8 AWG cards (2-Port and/or 4-Port) for a maximum of 32 Ports. Compact version holds up to 2 AWG cards (2-Port and/or 4-Port).
• Split output from 1 AWGx port to 2 noise injectors, expanding ports to total of 64 Ports
• Patented technology produces totally random “real-life” noise
• Inject crosstalk and impulse combined
• Independent control of each port
• Select from common crosstalk types such as SHDSL, ADSL, and VDSL
• Impulse noises such as REIN, SHINE and PEIN
• Specify NEXT, FEXT and number of disturbers
• Add in RFI and AWGN (at variable levels)
• Specify impedance, sampling rate and DUT location
• Optional Noise Modules setup and run all tests in standard automatically
• Design custom loops with Loop Configuration Editor
• Integrate with Telebyte WLS to control loop simulator
• Save custom noise files or entire configurations to repeat tests with ease and accuracy
• Import MATLAB (.mat) or Excel (.xls) noise files
• Remote control via RS-232, multiple Telnet sessions over Ethernet
• Adjust Amplitude of Crosstalk and Impulse noise
• Micro-Interruptions
  
• Optional component of Telebyte‘s solution for VDSL2 Vectored physical-layer testing

• Loop Simulation up to 36 MHz
• Test automation (multiplexing/de-multiplexing)
• AWGN generation
• TR-127 Ring Trip/Splitter Testing
• Plug-In modularity
• Multiple configurations possible
• 1, 2 or 8 Channels
• Optional Noise Sources
• Low noise floor / low crosstalk

All of our reliable 458 Loop Simulators plug into our Model 458-3SLB (3-Slot Chassis) or Model 458-CC-16/458-CM (16-Slot Chassis & Control Module) to create a wide variety of test configurations. The use of high-precision inductors, resistors and capacitors facilitates full bi-directional operation at all specified frequencies. Bandwidths up to 36 MHz accommodate the latest technologies.

Also available in this format, the 458-SM-2-16 (2 x 16 Transparent Switching Module), a highly-accurate multiplexing/demultiplexing device used to automate testing of ADSL, ADSL2, ADSL2+ and VDSL2 chips, modems and DSLAMs. In addition, the Model 458-AWGN2 (Dual Output AWGN Generator Line Module) injects Additive White Gaussian Noise (AWGN) for ADSL, ADSL2, ADSL2+, and VDSL2 chip/modem/DSLAM testing applications. Finally, the 458-RT Ring Trip Interference/AWGN Generator is used to simulate Ring Trip interference for TR-127 splitter testing.

 

• Bandwidth 20 kHz to 30 MHz
  
• Inject AWGN onto real cable or local loop simulator
• Solution for injecting AWGN for ADSL, ADSL2, ADSL2+, and VDSL2 chip/modem/DSLAM testing
• Plugs into our 458Series(16-Slot) or 458-3SLB(3-Slot) chassis
• AWGN levels can be controlled manually via front panel of chassis, or remotely via RS-232, Ethernet or IEEE-488 (GPIB)
• White Noise (AWGN) Generator (-90 dBm/Hz to -145 dBm/Hz)

The Model 458-AWGN2 is the ideal solution for injecting Additive White Gaussian Noise (AWGN) for ADSL, ADSL2, ADSL2+, and VDSL2 chip/modem/DSLAM testing applications. The user may add AWGN on the CO and/or CPE side, depending on their application. The 458-AWGN2 allows for common or independent noise levels on both sides. This line module produces a flat Power Spectral Density (PSD) over bandwidths from 20 kHz to 30 MHz. 

This module is plugged into our Model 458-3SLA (3-Slot) or 458-CC-16 (16 Slot) chassis where settings are controlled by a convenient keypad located on the front, RS-232, Ethernet or IEEE-488(GPIB). The modular design of Telebyte’s products allows the 458-AWGN2 to be combined with other line modules for a wide variety of test configurations. This module can also be used to inject AWGN onto real cable.

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