Product Overview
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.
Please note the VxT-N48 is compatible with Telebyte brand products only
| Built-In AWGN Generator Specifications: | |
| Simulation | Additive White Gaussian Noise (AWGN) |
| Bandwidth | Flat Power Spectral Density (PSD) over bandwidths from 20 kHz to 30 MHz |
| AWGN Crest Factor | => 5 |
| Output Impedance | 4k ohm Minimum (20 kHz to 30 MHz) |
| White Noise (AWGN) Generator | -90 dBm/Hz to -143 dBm/Hz in 1 dBm increments |
| Maximum Voltage Tip-Ring | 200 V |
| Output Mode | Differential, balanced 48 individually controllable, uncorrelated outputs |
| Differential Mode Noise Injection Specifications: | |
| Bandwidth | 20 kHz to 30 MHz |
| Output Impedance | 4k ohm Minimum at point of injection (20 kHz to 30 MHz) |
| Input Impedance | 50O unbalanced |
| Output Mode | Differential, balanced |
| Noise Floor | Below -143 dBm/Hz as measured at the output of the noise injector |
| Insertion Loss | 13.0 dB |