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Connecting the Positron Access Solutions BRX-VDSL2 Bandwidth Amplifier
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 configurations:
- Profile: 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 find 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.
Doc#: 180-0162-001-R03
INSTALLATION & TEST
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Summary of Contents for Positron BRX-VDSL2
- Page 1 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 find a proper ground point at the location where the BRX-VDSL2 is to be installed.
- Page 2 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.
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