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Related Manuals for Positron BRX-XLR Series
Summary of Contents for Positron BRX-XLR Series
- Page 1 BRX-XLR Broadband Reach eXtender – Extra Long Reach User Guide July 2019 BRX-XLR User Guide 180-0145-001-R05...
- Page 2 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-XLR User Guide...
- Page 3 Regulatory Compliance and Safety FCC Declaration of Conformance The BRX-XLR 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.
- Page 4 Always use a circuit that provides POTS sealing current to the copper pair to power the BRX-XLR models. Never use power injector devices not 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.
- Page 5 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-XLR products are intended for installation in Restricted Access Locations only whether installed indoor or outdoor.
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Page 6: Table Of Contents
Table of Contents General Description ......................6 BRX-XLR Main Advantages ..................... 6 Bandwidth Performance and Placement Flexibility ............6 Expected Bandwidth Improvement with BRX-XLR ............6 Typical Increases in Customer Serving Area ..............10 BRX-XLR Placement Flexibility ..................11 Optimum Placement......................13 BRX Cloud Calculator ...................... -
Page 7: General Description
General Description The Broadband Reach Extender – Extra Long Reach (BRX-XLR) is a fully integrated solution that extends the reach of deployed ADSL / ADSL2+ DSLAMs or MSANs to deliver higher bandwidth services to underserved or unserved markets. For example, it extends the reach of a 10 Mbps downstream service from 9,100 feet (2.8km) to 12,500 feet (3.8 km) on 26 AWG / 0.40mm gauge copper, an increase of almost 40%, and the same level of increase is achieved for larger size cables. - Page 8 The following chart illustrates how the performance gain increases over the length of copper loops. For clarity, we are using the notion of a Bandwidth Improvement Ratio to illustrate the benefits of installing a BRX-XLR device on a copper pair. The ratio is calculated as the bandwidth using the BRX-XLR divided by the RAW bandwidth (i.e.
- Page 9 Figure 2: Downstream Improvement Ratio vs Loop Length (meters) The table below illustrates a few examples of the bandwidth increases one can expect with the insertion of a BRX-XLR: BRX-XLR Downstream Performance Increase (Typical Lines) Loop Loop Gauge Without With Improvement Length Length...
- Page 10 Figure 3: Bandwidth vs. Loop Length (feet) with and without BRX-XLR Figure 4: Bandwidth vs. Loop Length (meters) with and without BRX-XLR BRX-XLR User Guide 180-0145-001-R05...
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Page 11: Typical Increases In Customer Serving Area
It should be noted that the 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. Our field experience has shown that the BRX-XLR provides even better Improvement Ratios (i.e. -
Page 12: Brx-Xlr Placement Flexibility
3.3 BRX-XLR Placement Flexibility Over and above the performance gains, one of the major advantages of the BRX-XLR over other products is that its placement along the loop is very flexible and does not impose hard constraints when choosing the location where it should be installed. For instance, on a 26 AWG (0.4mm) loop of 12,500 feet / 3.8 km, placing the BRX-XLR anywhere between 6,000 feet / 1.8 km and 9,000 feet / 2.7 km away from the DSLAM will deliver 10 Mbps to the customer. - Page 13 Figure 6: BRX-XLR Performance Improvement with Extended Placement Range (meters) Note: The above diagrams are based on 26 AWG (0.40mm) copper gauge. To convert to larger cables sizes, multiply the loop length by 1.374 for 24 AWG (0.51mm) and 1.844 for 22 AWG (0.64mm) cables.
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Page 14: Optimum Placement
3.4 Optimum Placement Although the placement of the BRX-XLR is very flexible, the curves in section 3.3 above demonstrate that there is value in properly planning the placement to optimize performance. The following curve demonstrates the optimum placement of the BRX-XLR relative to total loop length. Figure 7: Optimum BRX-XLR Placement vs Loop Length (feet) Figure 8: Optimum BRX-XLR Placement vs. -
Page 15: Brx Cloud Calculator
Having said that, service providers have a finite amount of locations per loop where they can install the BRX-XLR which will not always be at the optimum point. Positron Access has designed the BRX Cloud Calculator tool to assist in determining the optimum location for any given loop along with many suggested alternative placements with predicted performances. - Page 16 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”...
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Page 17: Technical Specifications
4 Technical Specifications BRX-XLR-2 BRX-XLR-8 BRX-XLR-24 Subscribers 9.25” x 5.5” x 1.5” 11.5” x 5.5” x 4.7 “ 21.3” x 13.5” x 10.6” Dimensions 235mm x 140mm x 38mm (285 mm x 140 mm x 118 mm) (541 mm x 343 mm x 269 mm) Weight 0.8 kg / 1.75 lbs. -
Page 18: Packaging Information And Port Density
5 Packaging Information and Port Density The BRX-XLR devices are available in 1, 2, 8 and 24 pair configurations. 5.1 BRX-XLR-1 and BRX-XLR-2 packaging The BRX-XLR-1 and BRX-XLR-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. -
Page 19: Brx-Xlr-24 Packaging
Figure 11: 8 pair BRX-XLR-8 enclosure. Figure 12: Opened BRX-XLR-8 enclosure The BRX-XLR-8 enclosure can be pole-mounted or strand-mounted using the same accessories as with the BRX-XLR-1 and BRX-XLR-2 enclosures described above (figure 10). 5.3 BRX-XLR-24 packaging The BRX-XLR-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. - Page 20 Figure 15: BRX-XLR-24-1SXPF. Figure 16: BRX-XLR-48-1SXPF BRX-XLR User Guide 180-0145-001-R05...
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Page 21: Installation And Operating Guidelines
6 Installation and Operating Guidelines General Requirements for the Outside Plant (OSP) The BRX-XLR is designed to be installed and operated as per the same guidelines and standard operating procedures used for typical ADSL and ADSL2+ lines. Qualify/Condition the Line: the copper loops must be qualified and conditioned for ADSL/ADSL2/ADSL2+ installations according to standard operator guidelines ... -
Page 22: Pots / Voice Lines
POTS / Voice Lines Voice (POTS) signal, when present, is transparently handled by the BRX-XLR. The BRX-XLR incorporates a POTS splitter function to allow the POTS traffic to flow normally while the ADSL2+/ADSL signals are amplified to obtain the best possible performance over the Outside Plant (OSP). - Page 23 The BRX-XLR needs to be powered from the POTS sealing current (-48V) originating from the DSLAM or the Central Office (CO). This is illustrated by Figure 18 below: Figure 18: Using Sealing Current to power the BRX-XLR BRX-XLR User Guide 180-0145-001-R05...
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Page 24: Installation Procedure
7 Installation Procedure Unpack When unpacking the equipment, be sure to check the contents of the packaging for completeness against your purchase order. Notify your supplier immediately if any items are missing. Note: Please save packing material. All equipment returned must be packed with the original packing material. -
Page 25: Overview Of The Brx-Xlr-8 Enclosure
Overview of the BRX-XLR-8 enclosure The BRX-XLR-8 supports up to 4 BRX-XLR-M modules enclosed in an IP65 / NEMA 4 weather resistant enclosure. Please refer to the diagram below for a summary of the device. All cables are Shielded, Gel- filled 24AWG/0.51mm cable Grounding Lug 8 pairs to the... -
Page 26: Step-By-Step Installation Instructions
Step-by-step Installation Instructions Step 1: select the location where the BRX-XLR device will be inserted as per the guidelines in this document. Step 2: connect the grounding lug of the unit to a proper ground (usually available near a splice point). Please refer to section 8.1 for more details about bonding and grounding considerations. - Page 27 The pin-out of the RJ21 (Amphenol) cables to be used with the BRX-24S is defined below. BRX-24S RJ21 PINOUT PIN NAME PIN# PIN# PIN NAME TIP1 RING1 TIP2 RING2 TIP3 RING3 TIP4 RING4 TIP5 RING5 TIP6 RING6 TIP7 RING7 TIP8 RING8 TIP9 RING9...
- Page 28 7.5.1 BRX-XLR-2 and BRX-XLR-8 Pole Mounting Option The BRX-XLR-2 and BRX-XLR-8 devices come with optional kits to facilitate mounting on a pole or to strand-mount the device (in-between 2 telephone poles). The BRX-XLR-2 and BRX-XR-8 enclosures can easily be screwed directly onto a standard telephone pole without the need for an additional mounting bracket.
- Page 29 7.5.2 BRX-XLR Strand Mounting Option When using the BRX-STRAND-K, use the supplied nuts and bolts to affix the strand mount bracket into the circular slots in the mounting flange at both ends of the 1-pair, 2-pair or 8-pair BRX-XLR enclosure as per the diagrams below. You can use any of the slots to adjust the strand mount bracket to clear any cables or devices already present.
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Page 30: Splicing Pairs
7.6 Splicing Pairs When installing a BRX-XLR device, it is important to follow the proper technique to ensure your safety and a good quality splice. You should follow the standard splicing Method and Procedure in place at your organization. 8 How to Mitigate the Impact of Disturbers A number of factors have a negative impact on xDSL performance and will disturb the performance and the quality of service that can be delivered to subscribers. - Page 31 Figure 26: Grounding and Bonding Whenever a telephone pedestal is placed within 2 meters (6 feet) of a power utility pole having a vertical multi-grounded neutral wire (MGNV) with impedance less than 25 Ohms, it is highly recommended to also bond the enclosure (cabinet or pedestal) to the multi-grounded neutral wire. Figure 27: Grounding and Bonding next to Power Utility Pole Each BRX-XLR unit mounted on a pole or installed directly on a strand are to have an effective ground.
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Page 32: Impulse Noise Protection
Figure 28: Grounding and Bonding Strand-Mount Units Impulse Noise Protection While the BRX-XLR is very effective at mitigating the impact of longer loops and the resulting higher signal attenuation, there are other factors that will negatively impact the performance of an xDSL loop. Let’s examine in this section how to mitigate the impact of noisy lines by leveraging the Impulse Noise Protection (INP) capabilities of the DSLAM and by providing proper grounding and bonding of the equipment in the copper Outside Plant (OSP). -
Page 33: Troubleshooting Guidelines
DSLAM, record the following information during synchronization events before contacting the support desk of Positron Access Solutions: - Downstream and Upstream SNR values - Line error status/counts (CES, ES, SES) - Any error messages from the DSLAM and/or the... - Page 34 3. The user CPE loses synchronization You should have the following equipment to help you with the DSLAM when the phone troubleshoot the problem: goes off-hook - Standard Telephone Test set and/or voltmeter Verify the following measurements: - Voltage in ON-HOOK state on the pair from the DSLAM and without the BRX-XLR installed should be -40VDC to -60VDC - Voltage in ON-HOOK state on the pair from the...
- Page 35 6. The DSLAM and CPE successfully Adjust the DSLAM configuration for the target establish synchronization but the and minimum SNR in the downstream and actual SNR is too low upstream directions 7. After inserting a BRX-XLR on a The BRX-XLR does impact adjacent copper pairs in copper loop, the performance of the same binder when some pairs downstream from other ADSL2+ / ADSL pairs in the...
- Page 36 DSLAM BRX-XLR pair is about 20VDC. If one of these two conditions is not met, the BRX-XLR is in fault. Please reach out to Positron Access Solutions customer support for assistance. Using the telephone test set, verify that the loop current at the CPE pair at NID location in the OFF-HOOK state is high enough (>...
- Page 37 Verify that the lightning protectors at the NID are in good working condition. Blown protectors would short the line making the POTS malfunction. Note the REN number for each phone connected to the line and sum them all. If the sum is higher than 5, the high number of phones is loading the line during ringing phase.
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Page 38: Warranty And Customer Service
10 Warranty and Customer Service Positron Access Solutions will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service. Warranty information can be found in your Positron Access customer web portal: http://www.positronaccess.com/Portal.php... -
Page 39: Ordering Information
11 Ordering Information Outdoor IP65 Assemblies BRX-XLR-1 BRX-XLR 1-pair module with solid state primary lightning protection enclosed in IP65 enclosure BRX-XLR-2 BRX-XLR 2-pair module with solid state primary lightning protection enclosed in IP65 enclosure BRX-XLR-8 BRX-XLR 8-pair enclosure for up to 4 BRX-XLR-M modules with solid state primary lightning protection enclosed in IP65 enclosure BRX-XLR-24 BRX-XLR 24-pair enclosure for up to 12 BRX-XLR-M modules with... -
Page 40: Annex A
Annex A Excerpt on Impulse Noise from Broadband Forum TR-176: ADSL2Plus Configuration Guidelines for IPTV Impulse noise is defined as electrical interference that occurs in short bursts. It may be caused by any number of sources, from large motors to arc welders, improper AC power and grounding to consumer electronic devices not performing to normal EMC design requirements. - Page 41 Changing the value of INP and/or Delay influences the error correction capability of the Reed- Solomon code. The ability to improve the line protection against impulsive noise has to be traded-off against increased FEC parity ratio and hence lower achievable net data rate. More specifically the INP (expressed in symbols) and Delay (in msec) are related to the FEC parity ratio by the following equation: FEC parity ratio = ½...
- Page 42 Extended Framing Parameters Table 14: Maximum Downstream Attainable Rate with 24K Interleaving and Extended Framing Parameters BRX-XLR User Guide 180-0145-001-R05...
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Page 43: Annex B
Annex B Positron Access Solutions – Pair Validation Guidelines Test & Pass / Fail Criteria Results Circuit and Pair ID Power Influence - < 80 dBrnC Noise - < 20 dBrnC Tip to Ground, ≤ |1.0 VDC Tip to Ring: 0 VDC Tip to Ground: <... -
Page 44: Annex C
Annex C Recommended ADSL and ADSL2+ Line Test Profile Parameters When using an ADSL tester, we recommend you set the device as per one of the following profile. Setting ADSL Line Test Profile Transmission System G.992-1 Trellis Coding Enabled Reed Solomon Enabled S=1/2 Enabled...
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