BRX-XLR User Guide
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3.5 BRX-XLR Calculator
To view the impact related to the installation of a BRX-XLR unit on a given loop whether it is a 26
AWG (0.40mm), 24 AWG (0.51mm) or a 22 AWG (0.64mm) copper pair, a PC tool is available. You
can request access to the Positron Customer Portal to download the BRX-XLR Calculator. Simply
sign up on the Portal at
http://www.positronaccess.com/Portal.php
You will then be sent a username
and password to access the Portal.
The BRX-XLR Calculator has three tabs at the bottom that can be used for the following objectives:
Calculate the achievable bandwidth based on the location of the BRX-XLR (from the DSLAM)
and the distance to the subscriber CPE;
Calculate the optimal bandwidth for a specific total loop length and gauge of wire and
recommend the location where the BRX-XLR should be installed (usually a range of distances
from the DSLAM) to achieve the target bandwidth;
Calculate the best placement of a BRX-XLR cabinet to achieve a target bandwidth to multiple
subscribers over a total loop length. This is useful to determine the Customer Serving Area
(CSA) for a given access speed tier.
Please feel free to request a copy of our BRX-XLR Calculator Quick Start Guide for any assistance
with using this tool.
3.6 Miscellaneous Other Placement Guidelines
3.6.1 Bonded Pairs
For convenience, the BRX-XLR Calculator does include an option (checkbox) for pair bonding. This
feature simply assumes that the two loops are essentially identical and therefore doubles the
resulting bandwidth for both downstream and upstream. In reality, bonded pairs are often not the
same length. It is recommended to enter the longest loop in the calculator in order to optimize
placement for this loop. Since the other loop is shorter, the resulting bandwidth resulting from the
bonded pairs should be slightly better than what the Calculator will predict.
