Positron BRX-VDSL2 User manual

BRX-VDSL2 User Guide 180-0153-001-R02
BRX-VDSL2
Broadband Reach eXtender –VDSL2
User Guide
March 2018

BRX-VDSL2 User Guide 1 180-0153-001-R02
Publication Information
©2018 Positron Access Solutions Corporation. All rights reserved.
BRX-VDSL2
User Guide
Publication date: March 2018
Printed in Canada
Published By
Positron Access Solutions Corporation
5101 Buchan Street, Suite 220
Montreal, Quebec, Canada
H4P 2R9
Telephone US and Canada: 1-888-577-5254
International: [phone]
Product names, other than Positron's, mentioned herein may be trademarks and/or registered
trademarks their respective owners.
Disclaimer Notice
Although Positron Access Solutions Corp. has made every effort to ensure the accuracy of the
information contained herein, this document is subject to change.

BRX-VDSL2 User Guide 2 180-0153-001-R02
Regulatory Compliance and Safety
FCC Declaration of Conformance
All of the BRX-VDSL2 models (includes BRX-VDSL2-X models) comply with part 15 class A of the
FCC Rules. Operation is subject to the following two conditions (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
Part 15 Class A Information
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates; uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Industry Canada
All of the BRX-VDSL2 models (including BRX-VDSL2-X models) comply with ICES-003 of the
Industry Canada Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
Tous les produits BRX-VDSL2 (incluant les produits BRX-VDSL2-X) sont conformes à la norme NMB-
003 d'Industrie Canada. Leur fonctionnement est sujet aux deux conditions suivantes: (1) le dispositif
ne doit pas produire de brouillage préjudiciable, et (2) ce dispositif doit accepter tout brouillage reçu, y
compris un brouillage susceptible de provoquer un fonctionnement indésirable.
Safety
The following BRX-VDSL2 models conforms to IEC 60950-1/UL 60950-1/CSA C22.2 #60950-1
and IEC 60950-22/UL 60950-22/CSA C22.2 #60950-22 standards:
BRX-VDSL2-2, BRX-VDSL2-8, BRX-VDSL2-24 sealed units along with the following factory
installation of a BRX-24S chassis in a UL approved pedestal: BRX-VDSL2-24-1SF, BRX-
VDSL2-24-1-SPF, BRX-VDSL2-24-1-SXPF, BRX-VDSL2-48-1SF, BRX-VDSL2-48-1-SPF,
BRX-VDSL2-48-1-SXPF.
BRX-VDSL2-X-2, BRX-VDSL2-X-8, BRX-VDSL2-X-24 sealed units along with the following
factory installation of a BRX-24S chassis in a UL approved pedestal: BRX-VDSL2-X-24-1SF,
BRX-VDSL2-X-24-1-SPF, BRX-VDSL2-X-24-1-SXPF, BRX-VDSL2-X-48-1SF, BRX-VDSL2-
X-48-1-SPF, BRX-VDSL2-X-48-1-SXPF.

BRX-VDSL2 User Guide 3 180-0153-001-R02
BRX-24S factory installed in UL approved pedestal and ready to accept BRX modules: BRX-
24-CS, BRX-24-1S, BRX-24-1SX, BRX-48-1S and BRX-48-1SX.
The BRX-24S conforms to IEC 60950-1/UL 60950-1/CSA C22.2 #60950-1.
Les modèles BRX-VDSL2 suivants sont conformes aux normes IEC 60950-1/UL 60950-1/CAN
C22.2 #60950-1 et IEC 60950-22/UL 60950-22/CAN C22.2 #60950-22.
BRX-VDSL2-2, BRX-VDSL2-8, BRX-VDSL2-24 dans leur boitier scellés ainsi que les
configurations incorporant un châssis BRX-24S assemblées en usine dans un piédestal
certifié UL: BRX-VDSL2-24-1SF, BRX-VDSL2-24-1-SPF, BRX-VDSL2-24-1-SXPF, BRX-
VDSL2-48-1SF, BRX-VDSL2-48-1-SPF, BRX-VDSL2-48-1-SXPF.
BRX-VDSL2-X-2, BRX-VDSL2-X-8, BRX-VDSL2-X-24 dans leur boitier scellés ainsi que les
configurations incorporant un châssis BRX-24S assemblées en usine dans un piédestal
certifié UL: BRX-VDSL2-X-24-1SF, BRX-VDSL2-X-24-1-SPF, BRX-VDSL2-X-24-1-SXPF,
BRX-VDSL2-X-48-1SF, BRX-VDSL2-X-48-1-SPF, BRX-VDSL2-X-48-1-SXPF.
BRX-24S installé en usine dans un piédestal certifié UL et prêts à recevoir des modules BRX:
BRX-24-CS, BRX-24-1S, BRX-24-1SX, BRX-48-1S and BRX-48-1SX.
Le BRX-24S est conforme aux normes IEC 60950-1/UL 60950-1/CSA C22.2 #60950-1.
Precautions and warnings
Always use a circuit that provides POTS sealing current to the copper pair to power a BRX-VDSL2
unit. When deploying a BRX-VDSL2 on a copper pair without sealing current, always make sure to
use power injector devices approved by Positron Access Solutions for that use. Using power injectors
with voltage higher than 48V nominal may create risk of damaging the unit and void its warranty.
There are no user-serviceable parts in BRX-VDSL2 devices. Do not attempt to open the unit. Doing
so may damage the seals and prevent the unit from meeting its IP rating. Damaged seals may lead to
rain water leaking into the unit and damage to its electronics resulting into its malfunction or its total
failure. The BRX-VDSL2 devices should only be opened by a technician trained and certified to
service the product.
All wiring external to the product should follow the local wiring codes.
Be careful when splicing the BRX-VDSL2 pairs to the twisted telephone cable pairs. Dangerous
voltage can be present on the pairs. Splicing should be done by a qualified person. Never splice pairs
during a lightning storm.

BRX-VDSL2 User Guide 4 180-0153-001-R02
The equipment must be connected to a protective ground in accordance with the instructions provided
in this manual. Always ensure that BRX-VDSL2 units are connected to a chassis ground path of 25
ohms or less to avoid damage to the equipment from lightning strikes and other electrical surges.
Use of this product in a manner other than defined in this installation guide may cause damage to
equipment or injury to personnel.
All fuses on the unit are located in non-accessible areas and are not field serviceable. Please return
the unit to Positron Access Solutions for repair.
The BRX-VDSL2 products are intended for installation in Restricted Access Locations only whether
installed indoor or outdoor.

BRX-VDSL2 User Guide 5 180-0153-001-R02
Table of Contents
1General Description.........................................................................................................6
2BRX-VDSL2 Main Advantages.........................................................................................7
3Bandwidth Performance and Placement Flexibility ......................................................7
3.1 Expected Bandwidth Improvement with BRX-VDSL2 and BRX-VDSL2-X........................7
3.2 BRX-VDSL2 Placement Flexibility.......................................................................................9
3.3 Optimum Placement...........................................................................................................10
3.4 BRX-VDSL2 Calculator ...................................................................................................... 11
3.5 Miscellaneous Other Placement Guidelines ....................................................................12
4Technical Specifications................................................................................................14
5Packaging Information and Port Density .....................................................................15
5.1 BRX-VDSL2 1-pair & 2-pair packaging..............................................................................15
5.2 BRX-VDSL2 8-pair packaging............................................................................................15
5.3 BRX-VDSL2 24-pair packaging..........................................................................................16
6Installation and Operating Guidelines..........................................................................18
6.1 General Requirements for the Outside Plant (OSP).........................................................18
6.2 POTS / Voice Lines.............................................................................................................19
6.3 Equipment Connection Diagram.......................................................................................19
7Installation Procedure....................................................................................................21
7.1 Unpack................................................................................................................................21
7.2 Overview of the BRX-VDSL2 / BRX-VDSL2-X-2 enclosure..............................................21
7.3 Overview of the BRX-VDSL2-8 / BRX-VDSL2-X-8 enclosure...........................................22
7.4 Overview of the BRX-24S Chassis....................................................................................22
7.5 Step-by-step Installation Instructions ..............................................................................23
7.6 Splicing Pairs .....................................................................................................................27
8How to Mitigate the Impact of Disturbers.....................................................................27
8.1 Grounding and Bonding....................................................................................................27
8.2 Impulse Noise Protection ..................................................................................................29
9Troubleshooting Guidelines..........................................................................................30
10 Warranty and Customer Service...................................................................................36
11 Ordering Information .....................................................................................................37
Annex A.................................................................................................................................38
Annex B.................................................................................................................................41
Annex C.................................................................................................................................42

BRX-VDSL2 User Guide 6 180-0153-001-R02
1 General Description
The Broadband Reach eXtender –VDSL2 (BRX-VDSL2) is a fully integrated solution that increases
the bandwidth and/ or extends the reach of DSLAMs or MSANs to deliver higher bandwidth
services to underserved or unserved markets. For example, it extends the reach of a 25 Mbps
downstream / 3 Mbps upstream service from 4,000 feet (1.2 km) to 6,000 feet (1.8 km) on 24 AWG
/ 0.51mm gauge copper, an increase of almost 50%, and the same level of increase is achieved for
larger size cables. Furthermore, this 50% increase in reach results in an estimated 100% increase
in CSA (Customer Serving Area) since the area served is proportional to the square of the lineal
distance.
It is important to note that these benefits are obtained without the need to change the
DSLAM/MSAN or the user CPE. By significantly increasing the effective bandwidth and reach of
existing xDSL lines, operators can deliver true broadband speeds to each of their subscribers, even
those located in remote areas or currently located too far from the DSLAM to receive any service.
The BRX-VDSL2 comes in two (2) versions. While they perform the same amplification function
and can be used for most of the same applications, their design is optimized as per the following
table.
FEATURE
BRX-VDSL2
BRX-VDSL2-X
Amplification Range
4000-8500 feet (24 AWG)
4000 –10000 feet (24 AWG)
Max Loop Length for 25 / 3
Mbps on single pair (24
AWG)
6000 feet (Non-Vectored and
Vectored)
6500 feet (Non-Vectored and Vectored)
Max Distance for 50 / 8 Mbps
on bonded pairs (24 AWG)
6000 feet (Non-Vectored and
Vectored)
6500 feet (Non-Vectored) and Vectored)
VDSL2 range extension
Up to 1500 feet
Up to 2250 feet
CSA Expansion
77%
200%
Amplification ratio
Up to 1.2 Downstream / up to 4.0
Upstream
1.2 to 1.9 Downstream / up to 4.1
Upstream
Form Factor
Same form factor, each pair has 2 LEDs to indicate presence of current and loop
status
Enclosure Options
Available in 1, 2, 8, 24 and 48 pairs enclosures
Management
Manageable (Detection, Location, Alerting, Troubleshooting) with integration with
ASSIA DSL Expresse and with Nokia Network Analyzer Copper (NAC)
Operation over POTS pairs
100% compatible with presence of
active POTS line. Limited current
consumption to guarantee 100%
compliance with POTS devices
Requires BRX Power Injector to
guarantee 100% compliance with POTS
devices
Operation over Dry pairs
BRX Power Injector can be used to power the BRX-VDSL2 devices when
operating on dry pairs (no -48Vdc sealing current present)
Table 1: Summary feature comparison of BRX-VDSL2 and BRX-VDSL2-X

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2 BRX-VDSL2 Main Advantages
Extends the VDSL2 Customer Serving Area (CSA) by 77-200%.
Improve effective bandwidth of VDSL2 loops.
The BRX-VDSL2 uses the -48V sealing current of the POTS line. When deployed over
dry pairs (no POTS sealing current), it can be powered from the Positron BRX Power
Injector.
The BRX-VDSL2-X requires slightly more power than the BRX-VDSL2. It can operate
over standard POTS sealing current when there is no POTS (dial tone) service.
Otherwise, when operated jointly with a POTS service (dial tone) or when deployed over
a dry pair, it requires the use of the Positron BRX Power Injector
Flexible Shelf design allows more subscribers to be added in the future.
Turnkey pedestal option available.
Auto calibration, no software to configure or dip switch.
Easy to install, deploy, and maintain.
3 Bandwidth Performance and Placement Flexibility
3.1 Expected Bandwidth Improvement with BRX-VDSL2 and BRX-VDSL2-X
Both versions of the BRX-VDSL2 automatically adapt their operation to the actual line conditions to
optimize performance. They provide gain amplification of the signal in the downstream (D1 and D2
bands) and upstream (U0 and U1 bands) direction making sure that the amplified signal is always
within the acceptable spectrum mask and signal strength allowed by the VDSL2 standards. BRX-
VDSL2 devices significantly improve the signal to noise ratio seen by the CPE (in the downstream
direction) and the DSLAM (in the upstream direction).
The table below illustrates a few examples of the bandwidth increases one can expect with the
insertion of a BRX-VDSL2 or BRX-VDSL2-X:
BRX-VDSL2 Downstream Performance Increase (Typical Lines)
NO Vectoring
Total Loop Length
(24 AWG / 0.51 mm)
Not
Amplified
BRX-VDSL2
BRX-VDSL2-X
Feet
Meters
DS / US
(Mbps)
DS / US
(Mbps)
Improvement
Ratio
DS / US
(Mbps)
Improvement
Ratio
5000
1524
26.3 / 2.8
33.2 / 6.4
1.26 / 2.29
34.5 / 6.2
1.31 / 2.21
6000
1829
24.1 / 1.3
25.7 / 4.3
1.07 / 3.31
27.8 / 4.2
1.15 / 3.23
6500
1981
21.1 / 1.3
21.8 / 2.7
1.03 / 2.08
25.0 / 3.3
1.18 / 2.54
Table 2: Downstream Performance Increase Examples (Typical Lines) –NO Vectoring

BRX-VDSL2 User Guide 8 180-0153-001-R02
The graph below illustrates the amplified downstream bandwidth resulting from the use of BRX-
VDSL2 and BRX-VDSL2-X devices compared to the non-amplified (raw) bandwidth (24 AWG /
0.51mm copper gauge) with profile 17a in Non-Vectored mode. Profiles 8a, 8b and 8d achieve very
similar bandwidth amplification results.
Figure 1: Amplified Downstream VDSL2 Bandwidth vs non-amplified (raw) loops (distance in feet)
The amplified upstream bandwidth resulting from the use of BRX-VDSL2 and BRX-VDSL2-X devices
compared to the non-amplified (raw) bandwidth (24 AWG / 0.51mm copper gauge) with profile 17a in
Non-Vectored mode are shown below. Profiles 8a, 8b and 8d achieve very similar bandwidth
amplification results.
Figure 2: Amplified Upstream VDSL2 Bandwidth vs non-amplified (raw) loops (distance in feet)

BRX-VDSL2 User Guide 9 180-0153-001-R02
It should be noted that the Downstream and Upstream Bandwidth Performances above (both in the
graphs and in the table) are conservative as they are based on tests performed with traffic on the
other pairs of the cable binder (i.e. with crosstalk) and with otherwise typical copper line conditions.
Field experience has shown that the BRX-VDSL2 devices provide even better Improvement Ratios
(i.e. Bandwidth Enhancement) when faced with “less than ideal” line conditions where the bandwidth
is negatively impacted by bridge taps, influence from power lines and/or disturbances from other
pairs or the use of other protocols in the same binder such as T1/E1, HDSL, and G.SHDSL.
3.2 BRX-VDSL2 Placement Flexibility
Over and above the performance gains, one of the major advantages of the BRX-VDSL2 devices
over other products is that their placement along the loop is flexible and does not impose hard
constraints when choosing the location where they should be installed. For instance, on a 24 AWG
(0.51mm) loop of 6000 feet / 1.8 km, placing the BRX-VDSL2 anywhere between 3000 feet / 0.9 km
and 3750 feet / 1.15 km (2750 feet / 0.84 km and 3750 feet / 1.15 km) away from the DSLAM will
deliver a 25 / 4 Mbps service to the customer. The BRX-VDSL2-X will typically provide higher
performance in both the downstream and upstream when compared to the BRX-VDSL2 version.
Figure 3: Downstream Placement flexibility of BRX-VDSL2 on a 6000 feet loop

BRX-VDSL2 User Guide 10 180-0153-001-R02
Figure 4: Upstream Placement flexibility of BRX-VDSL2 on a 6000 feet loop
BRX-VDSL2 devices are designed to offer very similar performance gains whenever they are
deployed at a distance that ranges from 45-60% of the total loop distance (away from the DSLAM).
3.3 Optimum Placement
Although the placement of BRX-VDSL2 devices is flexible, the curves in section 3.2 above
demonstrate that there is value in properly planning the placement to optimize performance. The
following curve demonstrates the optimum placement of the BRX-VDSL2 relative to total loop length.
Figure 5: Optimum Downstream BRX-VDSL2 / BRX-VDSL2-X Placement vs Loop Length (feet)

BRX-VDSL2 User Guide 11 180-0153-001-R02
Figure 6: Optimum Upstream BRX-VDSL2 / BRX-VDSL2-X Placement vs Loop Length (feet)
As can be seen, there is a general trend that drives towards the midpoint of the loop as the total loop
length increases. Having said that, service providers have a finite amount of locations per loop
where they can install a BRX-VDSL2 device which will not always be at the optimum point. Positron
Access has designed the BRX-VDSL2 Calculator tool to assist in determining the optimum location
for any given loop along with many suggested alternative placements with predicted performances.
The BRX-VDSL2 calculator can also be used to select which version of the BRX-VDSL2 is best for a
specific application or loop length.
3.4 BRX-VDSL2 Calculator
To view the impact related to the installation of a BRX-VDSL2 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 Windows application tool is
available. You can request access to the Positron Customer Portal to download the BRX-VDSL2
Calculator. 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-VDSL2 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-VDSL2 device (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-VDSL2 device should be installed (usually a range of
distances from the DSLAM) to achieve the target bandwidth;
Calculate the best placement of a BRX-VDSL2 device to achieve a target bandwidth to
multiple subscribers over a total loop length from a single location. For instance, the BRX-
VDSL2-8 / BRX-VDSL2-X-8 is ideal to serve up to 8 subscribers on a single pair (or 4

BRX-VDSL2 User Guide 12 180-0153-001-R02
subscribers with pair bonding) from the recommended location. 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-VDSL2 Calculator User Guide (180-0171-001) for any
assistance with using this tool.
3.5 Miscellaneous Other Placement Guidelines
3.5.1 Bonded Pairs
For convenience, the BRX-VDSL2 Calculator does include an option (checkbox) for pair bonding.
This feature 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.
3.5.2 Vectoring and VDSL2 Profile Selection
The BRX-VDSL2 devices fully support vectoring. They also support the following VDSL2 profiles:
17a, 8a, 8b and 8d. When using the BRX-VDSL2 calculator, you should make sure to set the
vectoring and profile values that match the DSLAM settings for more accurate calculations.
3.5.3 Actual Raw Throughput is Different from Predicted Values
There will be times when actual raw throughput will be significantly different (>10%) from predicted
values from the Calculator. This may be caused by a number of factors. One of the most likely
reason is that the Target SNR default value in the BRX-VDSL2 Calculator (default set to 8 dB), is not
the same as the one provisioned in the DSLAM. If that is the case, change the value in the Target
SNR box to match the DSLAM setting. If this does not resolve the issue, then it may be because you
are faced with “less than ideal” line conditions where the bandwidth is negatively impacted by bridge
taps, influence from power lines and/or disturbances from other pairs or the use of other protocols in
the same binder such as T1/E1, HDSL, and G.SHDSL. As a result, it is difficult to predict what the
expected bandwidth will be but we recommend that you still follow the optimal placement
recommended by the BRX-VDSL2 Calculator for the actual loop length and gauge.
Note: In order to predict the expected bandwidth as accurately as possible, it is recommended to use
the “Optimized Bandwidth Analysis” button in the lower right corner of the Calculator and increase the
loop length (and recalculate) until the “Raw Downstream Bandwidth”in column 4 is equal to what you
are measuring. Once that is achieved, the amount indicated in column 6 entitled “With BRX-VDSL2
Downstream Bandwidth” should be a good estimate of what you can obtain.
Note: please refer to the BRX-VDSL2 Calculator User Guide (180-0171-001) for more details.

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3.5.4 Minimum and Maximum Distance Values for the BRX-VDSL2 Calculator
To facilitate the planning process, the BRX-VDSL2 Calculator will provide a warning in red whenever
a distance or loop length value entered does not meet the proper range of allowed values to ensure
proper and useful performance. These criteria, for 24 AWG (0.51 mm) cables, are:
1) Minimum Loop Length from DSLAM to BRX-VDSL2 (L1) should be no less than: 2,000 feet (600
meters).
2) Minimum Loop Length from CPE to BRX-VDSL2 (L2) should be no less than: 500 feet (150m).
In addition, a red warning will pop up if the Total Loop Length is less than 4000 feet (1.2 km) or more
than 8,000 feet (2.4 km) for the BRX-VDSL2 or 10,000 feet (3.0 km) for the BRX-VDSL2-X. It is
important to note that the product is still operational but the amplification results will not be optimal
outside of the recommended operating range.
1) Maximum distance for 25 / 4 Mbps service: 6000 feet (1.8 km) with BRX-VDSL2 or BRX-VDSL2-X
2) Maximum distance for 10 / 1 Mbps service: 8,000 feet (2.4 km) with BRX-VDSL2-X

BRX-VDSL2 User Guide 14 180-0153-001-R02
4 Technical Specifications
BRX-VDSL2-2
BRX-VDSL2-X-2
BRX-VDSL2-8
BRX-VDSL2-X-8
BRX-VDSL2-24
BRX-VDSL2-X-24
Subscribers
2
8
24
Dimensions
9.25” x 5.5” x 1.5”
235mm x 140mm x 38mm
11.5” x 5.5” x 4.7 “
(285 mm x 140 mm x 118 mm)
21.3” x 13.5” x 10.6”
(541 mm x 343 mm x 269 mm)
Weight
0.8 kg / 1.75 lbs.
2.15 kg / 4.7 lbs.
10.45 kg / 23 lbs.
Table 3: Dimensions and weight
Operating Temperature
-40°C to +65°C
Relative Humidity
5% to 95% (Non-condensing)
xDSL Standards
ITU-T G.993.2 VDSL2
ITU-T G.993.5 (G.Vector)
ITU-T G.997.1 (G.ploam)
ITU-T G.998.4 (G.INP)
ITU-T G.992.5 ADSL2+ Annex A
ITU-T G.992.3 ADSL2 Annex A
ITU-T G.992.1 ADSL Annex A
PSD Mask
Compliant with ANSI T1.413 and ETSI TS 101 830-1
Power Draw
BRX-VDSL2: Maximum is 250 mW per pair
BRX-VDSL2-X: Maximum is 650 mW per pair
Regulatory Compliance
UL/CSA, FCC part 15 Class A
Tip/Ring Over-voltage
Protection
2/10 μsec, 1 kA
8/20 μsec, 800A
10/160 μsec, 400A
10/700 μsec, 350A
10/560 μsec, 250A
10/1000 μsec, 200A
Table 4: Technical specifications

BRX-VDSL2 User Guide 15 180-0153-001-R02
5 Packaging Information and Port Density
The BRX-VDSL2 devices are available in 1, 2, 8 and 24 pair configurations.
5.1 BRX-VDSL2 1-pair & 2-pair packaging
The BRX-VDSL2-1 / BRX-VDSL2-2 and BRX-VDSL2–X-1 / BRX-VDSL2-X-2 share the same
enclosure and can easily be mounted on a pole, attached to a strand wire or even installed in an
existing cabinet or pedestal. These units share the following features:
Sealed (IP65 / NEMA 4) enclosure
Integrated Solid-State Primary Lightning Protection
#6 Lug for grounding
Gel-filled shielded cables
Status LEDs: 2 LEDs per pair (DS = downstream / US = upstream)
o(requires -48Vdc sealing current to turn on LEDs)
OFF
No power
RED: flashing
Power too low, card reboot
RED: on
Power present but no DSL signal
GREEN: flashing
Auto- calibration acquiring gain
GREEN: on
Gain acquired
End-plate incorporates Pole Mount Bracket (also used to attach the strand mounting fixture kit
Strand-Mount Fixture (Optional kit)
Figure 7: 1 and 2 pair BRX-VDSL2 devices. Figure 8: Strand-mount option
In areas where more than 2 pairs need amplification, an 8-pair and a 24-pair enclosure can be used.
5.2 BRX-VDSL2 8-pair packaging
The BRX-VDSL2-8 / BRX-VDSL2-X-8 comes equipped with an IP65 enclosure that houses four (4)
two-pair modules (as per image on the right below) for a total of eight (8) subscriber loops. Each
BRX-VDSL2-M / BRX-VDSL2-X-M card has solid-state primary lightning protection for both pairs. In

BRX-VDSL2 User Guide 16 180-0153-001-R02
cases where more than 2 but less than 8 pairs are required, it is possible to order an empty enclosure
(BRX-8C) and the required number of 2-pair modules (BRX-VDSL2-M / BRX-VDSL2-X-M) that are
required. Any empty slots in the BRX-8C may be filled with BRX-BYPASS-TEST modules to allow for
the pre-wiring of all the pairs in and out of the BRX-8C enclosure.
Figure 9: 8 pair BRX-VDSL2 enclosure. Figure 10: Opened 8-pair BRX-VDSL2 enclosure
The BRX-VDSL2 8-pair enclosure can be pole-mounted or strand-mounted using the same
accessories as with the 1-pair and 2-pair BRX-VDSL2 enclosures described above (figure 8).
5.3 BRX-VDSL2 24-pair packaging
The BRX-VDSL2-24 / BRX-VDSL2-X-24 comes equipped with an IP65 enclosure that houses up to
twelve (12) two-pair modules using the BRX-24S shelf (as per image on the right below) for a total of
twenty-four (24) subscriber loops. Each BRX-VDSL2-M / BRX-VDSL2-X-M card has solid-state
primary lightning protection for both pairs; where required, an optional 24-pairs IN and 24-pairs OUT
protection module that can house standard 5-pin protector modules can be inserted as per figure 12
when it is standard practice to always use on additional gas tube protection for any OSP device. In
cases where more than 2 but less than 24 pairs are required, it is possible to order an empty
enclosure (BRX-24CS) and the required number of 2-pair modules (BRX-VDSL2-M / BRX-VDSL2-X-
M) that are required. Any empty slots in the BRX-24CS may be filled with BRX-BYPASS-TEST
modules to allow for the pre-wiring of all the pairs in and out of the BRX-24CS enclosure.
Figure 11: 24 pair BRX-VDSL2 enclosure Figure 12: Opened 24-pair BRX-VDSL2 enclosure
Note: The BRX-24S can also be inserted in suitable 3rd party pedestal and enclosures with an IP65 or
higher environmental rating. For instance, you can order the BRX-VDSL2-24-1SXPF (or BRX-VDSL2-24-

BRX-VDSL2 User Guide 17 180-0153-001-R02
X-1SXPF) where an Emerson CAD-12 pedestal is factory installed with a BRX-24S, 12 BRX-VDSL2
modules and an optional cross-connect and protection module (figure 13). The Emerson CAD-12 pedestal
can also be fitted with two (2) BRX-24S to amplify up to 48 pairs when you select the BRX-VDSL2-48-
1SXPF (or BRX-VDSL2-X-48-1SXPF) version as per figure 14. Please refer to the BRX Product Selection
Guide for more details.
Figure 13: BRX-VDSL2-24-1SXPF. Figure 14: BRX-VDSL2-48-1SXPF

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6 Installation and Operating Guidelines
6.1 General Requirements for the Outside Plant (OSP)
The BRX-VDSL2 devices are designed to be installed and operated as per the same guidelines and
standard operating procedures used for typical VDSL2 loops.
Qualify/Condition the Line: the copper loops must be qualified and conditioned for VDSL2
installations according to standard operator guidelines
Loaded/Non-loaded Loops. Loops should be non-loaded although the BRX-VDSL2 device
can operate with VDSL2-compliant loading coils
Bridged Taps: all bridged taps should be removed for optimum performance
Insulation Resistance: Tip-Ring, Tip-Ground and Ring-Ground Insulation Resistance should
be greater than 5 Meg-Ohms
Longitudinal Balance. Longitudinal balance should be greater than or equal to 60 dB
System Ground: perform system ground per local company policies and practices
Loop Resistance: the actual loop resistance between the DSLAM and the BRX-VDSL2
device should be verified at the time of the splicing
No Split Pairs: ensure that the path does not have “split pairs” (tip on one pair and ring on the
other) as it will induce plenty of crosstalk.
You should follow established standards for pair validation. The following check list can also be used
to validate the pair(s).
Test & Pass / Fail Criteria
Results
Power Influence - < 80 dBrnC
Noise - < 20 dBrnC
Tip to Ground, ≤ |1.0 VDC
Tip to Ring: 0 VDC
Tip to Ground: < 5 VAC (should match Ring to Ground AC Voltage)
Ring to Ground: : < 5 VAC (should match Tip to Ground AC Voltage)
Tip to Ground Insulation Resistance Ohms ≥ 5 MΩ
Ring to Ground Insulation Resistance Ohms ≥ 5 MΩ
Tip to Ring Insulation Resistance Ohms ≥ 5 MΩ
Longitudinal Balance ≥ 60 dB
Load coils - If required, only use SMART Loading Coils
Bridge Tap: No bridge tap should be found
Important Note: Please make sure the Test Set is set to VDSL2 Mode
Table 5: Pre-installation checklist

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6.2 POTS / Voice Lines
Voice (POTS) signal, when present, is transparently handled by the BRX-VDSL2. The BRX-VDSL2
incorporates a POTS splitter function to allow the POTS traffic to flow normally while the VDSL2
signals is amplified to obtain the best possible performance over the Outside Plant (OSP). When
using a BRX-VDSL2-X version of the device, you will need to install a Positron BRX Power Injector to
allow for proper POTS (dial tone) operation on the pair amplified by the BRX-VDSL2-X device if
support for a POTS dial tone is required.
6.3 Equipment Connection Diagram
BRX-VDSL2 devices are typically deployed adjacent to a splice point facilitating the selection of the
VDSL2 pair(s) requiring bandwidth amplification.
The following diagram illustrates how a BRX-VDSL2 device can be inserted between a DSLAM or
MSAN and the subscribers it serves. Looking at the diagram below, the BRX-VDSL2 device is
typically installed at a distance of 2,000-4,000 feet (0.6 to 1.2 km) from the DSLAM and provides
increased bandwidth to a remote subscriber located up to 8,000 feet away (2.4 km) when using a
BRX-VDSL2 version and (10,000 feet away (3.0 km) when using a BRX-VDSL2-X) on a 24 AWG
(0.51 mm) copper loop.
Figure 15: inserting a BRX-VDSL2 device on a VDSL2 loop
Where L1: BRX-VDSL2 connection to the DSLAM and L2: BRX-VDSL2 connection to the CPE Modem.