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VxT-48-DC2 xTalk Emulator for TR-249 Testing
Automated Performance
& Stability Testing Solution
Simulating Crosstalk on 48 Line Pairs
Main Features
product overview
Introducing Telebyte’s intermediate Crosstalk Emulator, designed to simulate the three test loops in TR-249 Issue 1. 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.
Millions of Vectored VDSL2 lines have now been deployed . . .
. . .Telebyte is ready with the intermediate version of their crosstalk emulation series. Building on the original design, Telebyte’s VxT-8-DC2 Crosstalk Emulator simulates the three test loops defined in the Broadband Forum’s TR-249 Issue 1 test plan and provides micro-interruptions on both sides of the loop. The VxT-48-DC2 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.
Emulation
The VxT-48-DC2 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 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 line section emulates the insertion loss of the following loops:
|
Test Loop |
Attenuation at 1 MHz |
Type |
Examples |
|
WT-249 Issue 2 |
3.49 dB |
Collocated |
150 m / 0.4 mm PE |
|
TR-249 Issue 1 |
7.50 dB |
Collocated or |
300 m / 0.4 mm PE |
|
TR-249 Issue 1 |
10.25 dB |
Collocated or |
450 m / 0.4 mm PE |
|
TR-249 Issue 1 |
13.25 dB |
Collocated or |
600 m / 0.4 mm PE |
Compliant with all loops defined in Table 17 of the TR-249 Issue
1.
Custom CAT7 TERA Cables Quoted Upon Request
Ordering Options
| Model | Description |
| VxT-48-DC2 | TR-249 Crosstalk Emulator with Basic Micro-Interruptions |
Product Specifications
| Simulation | • 48 Independent Loops • 3 selectable loop lengths per channel (non-collocated testing) • 4 selectable loop lengths for all channels (collocated testing) • 1128 crosstalk channels emulate a 48 x 48 coupling matrix |
| Maximum Modem Output Power Allowed |
20 dBm |
| Average Noise Floor | < -143 dBm/Hz |
| Accuracy Insertion Loss (at 1 MHz) | Short Loop (30 MHz profile): 3.49 dB Short Loop (17 MHz profile): 7.75 dB Medium Loop (17 MHz profile): 11.625 dB Long Loop (17 MHz profile): 15.5 dB |
| Crosstalk Accuracy | Meets all the crosstalk accuracy requirements stated in section 6.3.5 of TR-249 Issue 1 dated March 2014 |
| Remote Control | IEEE 802.3 Ethernet, including high-level command set for remote control |
| Micro Interruption (Basic) | 2.5 ms minimum Delay and repeat options Micro-interruptions are not compliant with TR-249 Issue 1 |
| Power Supply | DC power 48 V (100 W maximum) +/- 10% |
| DC Rating | 50 V maximum |
| xDSL Connection | 12 CAT7 TERA Connectors at CO side of loop 12 CAT7 TERA Connectors at CPE side of loop |
| Dimensions | 355 mm x 465 mm x 278 mm (H x W x D) |
| Mounting options | Mountable in 19" rack |
Specifications are subject to change without notice. Made in USA