Positron BRX-VDSL2 User manual

www.positronaccess.com
Connecting the Positron Access Solutions BRX-VDSL2 Bandwidth Amplier
The following procedure will take you through the basic steps to qualify a copper loop BEFORE and AFTER the installation
of the BRX-VDSL2 in order to assess the performance gain resulting from the insertion of the BRX-VDSL2 on the
subscriber pair.
Step 1: BRX-VDSL2 Placement Determination
To start you must have the actual cable makeup (cable gauges and lengths) for the loop to the customer. Drop distance
and gauge should also be included.
Find a likely location along the route that is near the midpoint of the loop and where it will be relatively easy to install the
BRX-VDSL2. For example, load points, splices, and gauge-change locations where pairs are relatively available (so to
speak) are likely spots to install the BRX-VDSL2.
Step 2: Ensure that the DSLAM has the following congurations:
- Prole: 17a or 8d
- Path Setting Mode: Interleave
- INP Recommended Settings: 2 symbols for DS and 1 symbol for US
Step 3: Before inserting the BRX-VDSL2 on the copper pair, you should access the DSLAM / MSAN Performance
Statistics page and record the following performance information between the DSLAM / MSAN and the subscriber CPE:
Downstream Training Rate
Upstream Training Rate
Downstream Maximum Attainable Bit Rate
Upstream Maximum Attainable Bit Rate
Downstream Maximum Transmit Rate
Downstream Minimum Transmit Rate
Upstream Maximum Transmit Rate
Upstream Minimum Transmit Rate
Downstream SNR Margin
Upstream SNR Margin
Step 4: Insert the BRX-VDSL2 at the desired location, making sure to connect the grounding lug of the unit to a proper
ground (less than 25 ohms). You will usually nd a proper ground point at the location where the BRX-VDSL2 is to be
installed.
Important Note: The BRX-VDSL2 unit is powered from the sealing current found on a standard POTS pair. The
BRX-VDSL2 will not work on a dry pair (line with no sealing current). Each pair of the BRX-VDSL2 is powered
independently with each pair requiring the presence of the sealing DC Voltage for proper operation.
INSTALLATION & TEST
Doc#: 180-0162-001-R03

Positron Access Solutions Corp. © 2018 All rights reserved. Some trademarks may belong to 3rd party entities.
Corporate Headquarters: 5101 Buchan Street, Suite 220, Montreal, QC H4P 2R9 Canada www.positronaccess.com
Step 5: Connect one of the BRX-VDSL2 DSLAM-side pairs to the corresponding pair from the DSLAM / MSAN. If you are
using the BRX-VDSL2 to serve two (2) different subscribers or if you use two (2) bonded pairs to serve a single customer,
you will have to connect each pair. The DSLAM-side pairs are color-coded as follows:
• DSLAMLine1Blue/White
• DSLAMLine2Orange/White
Once connected, the corresponding LEDs should turn GREEN to signify the presence of -48 VDC sealing current.
Step 6: Connect the corresponding BRX-VDLS2 CPE-side pair(s) to the pair(s) going to the subscriber home.
• CPELine1Blue/White
• CPELine2Orange/White
Important Note: Please make sure to match the corresponding DSLAM-side pair number to the corresponding
CPE-side pair number.
Once this step is completed, the DSLAM and the CPE will retrain the circuit and bring up the VDSL2 link with the higher
bandwidth. During this process, LEDs will blink for a very short period of time until the optimal amplication gain is
determined, at which point they will both turn solid GREEN. At this point, the DSLAM and CPE are synchronized and are
in the training process which may take another minute or two.
Step 7: Access the DSLAM/ MSAN Performance Statistics and record the improved results:
Downstream Training Rate
Upstream Training Rate
Downstream Maximum Attainable Bit Rate
Upstream Maximum Attainable Bit Rate
Downstream Maximum Transmit Rate
Downstream Minimum Transmit Rate
Upstream Maximum Transmit Rate
Upstream Minimum Transmit Rate
Downstream SNR Margin
Upstream SNR Margin
If the DSLAM / MSAN is set to a specic Maximum Transmit rate for the Downstream and Upstream direction that is
lower than the Maximum Attainable Downstream and Upstream rate, you should increase the DSLAM / MSAN settings
to the Maximum Attainable Downstream and Upstream rates in order to fully benet from the additional bandwidth
resulting from the insertion of the BRX-VDSL2 on the subscriber pair.
End of BRX-VDLS2 installation procedure
Additional Deployment Considerations
Bonded Pairs
Bonded pairs are often not the same length. In that case, it is recommended to identify a location that is near the midpoint
of the longest loop.
Minimum and Maximum Loop Length Values for the BRX-VDSL2
The BRX-VDSL2 is designed to operate on copper loops of 4,000 to 8,000 feet (24 AWG equivalent)/ 1.2 to 2.4 km
(0.51 mm equivalent).