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BRX-VDSL2 User Guide

180-0153-001-R02

Annex C

Recommended VDSL2 Line Test Profile Parameters

When using a VDSL2 tester, we recommend you set the device as per one of the following profile.

Setting

VDSL2 Line Test Profile

Transmission System

G.993.2

Trellis Coding

Enabled

Reed Solomon

Enabled

S=1/2

Enabled

SRA

Enabled

SRA Downshift Interval

30 seconds

SRA Upshift Interval

30 seconds

Parameter

DOWNSTREAM

UPSTREAM

Maximum Bitrate

100 Mbps

50 Mbps

Minimum Bitrate

32 Kbps

Maximum Delay

8 msec

Impulse Noise Protection (INP)

Maximum SNR Margin

16.0 dB

Target SNR Margin

8.0 dB

Minimum SNR Margin

2.0 dB

SNR Margin Upshift

9.0 dB

SNR Margin Downshift

5.0 dB

Bit Swapping

Enabled

Table 15: Recommended VDSL2 Test Set Profile

Summary of Contents for BRX-VDSL2

Page 1: ...BRX VDSL2 User Guide 180 0153 001 R02 BRX VDSL2 Broadband Reach eXtender VDSL2 User Guide March 2018 ...

Page 2: ...orporation 5101 Buchan Street Suite 220 Montreal Quebec Canada H4P 2R9 Telephone US and Canada 1 888 577 5254 International 1 514 345 2220 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 herei...

Page 3: ...s 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 Indus...

Page 4: ... 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 Po...

Page 5: ...he 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 i...

Page 6: ...r packaging 15 5 3 BRX VDSL2 24 pair packaging 16 6 Installation 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 7 Installation 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...

Page 7: ...ion 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 a...

Page 8: ...d 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 d...

Page 9: ...imilar 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 ...

Page 10: ...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 5...

Page 11: ...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 B...

Page 12: ...r 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 us...

Page 13: ... 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 ...

Page 14: ...1 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 r...

Page 15: ...erature 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...

Page 16: ...am 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 mou...

Page 17: ...ht 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 devi...

Page 18: ...nal 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 ...

Page 19: ...rform 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 foll...

Page 20: ...nt 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 ...

Page 21: ...is is illustrated by Figure 16 below Figure 16 Using Sealing Current to power the BRX VDSL2 The BRX VDSL2 devices can also be powered from a Positron BRX Power Injector providing the required 48Vdc sealing current via the POTS combiner circuitry of the DSLAM This is illustrated by Figure 17 below Figure 17 Using a Positron BRX Power Injector to power a BRX VDSL2 device ...

Page 22: ...d broken connectors If the equipment appears to have been damaged in transit please contact your delivery company 7 2 Overview of the BRX VDSL2 BRX VDSL2 X 2 enclosure The BRX VDSL2 2 BRX VDSL2 X 2 is a standalone unit enclosed in an IP65 NEMA 4 weather resistant enclosure Please refer to the diagram below for a summary of the device Note the BRX VDSL2 1 BRX VDSL2 X 1 shares the same enclosure and...

Page 23: ...modules BRX VDSL2 M and BRX VDSL2 X M The BRX 24S chassis is designed to be installed into an IP65 or better compliant outdoor enclosure such as the BRX 24C or BRX 1 Emerson CAD 12 pedestal Please refer to the diagram below for a summary of the chassis Figure 20 BRX 24S Chassis with cover and without cover Grounding Lug Shielded gel filled 24AWG 0 51mm cable 8 pairs to the subscriber CPE Mounting ...

Page 24: ... numbered from the top to the bottom as per the following table Slot Number Pair Assignment Pair Color 1 topmost slot 1 left side 2 right side White Blue White Orange 2 3 left side 4 right side White Green White Brown 3 5 left side 6 right side White Slate Red Blue 4 7 left side 8 right side Red Orange Red Green 5 9 left side 10 right side Red Brown Red Slate 6 11 left side 12 right side Black Blu...

Page 25: ...9 RING4 TIP5 5 30 RING5 TIP6 6 31 RING6 TIP7 7 32 RING7 TIP8 8 33 RING8 TIP9 9 34 RING9 TIP10 10 35 RING10 TIP11 11 36 RING11 TIP12 12 37 RING12 TIP13 13 38 RING13 TIP14 14 39 RING14 TIP15 15 40 RING15 TIP16 16 41 RING16 TIP17 17 42 RING17 TIP18 18 43 RING18 TIP19 19 44 RING19 TIP20 20 45 RING20 TIP21 21 46 RING21 TIP22 22 47 RING22 TIP23 23 48 RING23 TIP24 24 49 RING24 TIP25 25 50 RING25 Table 8 ...

Page 26: ...0 8 5 mm by 20 3 mm in the mounting flange at both ends of the BRX VDSL2 enclosure and secure around the pole as per the diagrams below Figure 21 Pole Mount installation for BRX VDSL2 1 pair and 2 pair enclosures Figure 22 Pole Mount installation for BRX VDSL2 8 pair enclosures When using the BRX XLR POLE KIT insert a metallic or plastic strap into the rectangular slot in the mounting flange at bo...

Page 27: ...tween the strand and the BRX VDSL2 enclosure can vary from 3 9 76 228 mm Strand Diameter can range from 6 6 mm to 3 8 10 mm Bracket Material stamped from 5052 H34 Aluminum Mounting Bolt Grade 2 steel and hot dip galvanized as per ASTM A153 Figure 23 Strand Mount Kit option for 1 pair and 2 pair BRX VDSL2 enclosures Figure 24 Strand Mount Kit option for 8 pair BRX VDSL2 enclosures Secure the strand...

Page 28: ... may help to reduce the impact of these disturbers 8 1 Grounding and Bonding Although grounding is usually observed within the cabinets or pedestal at the splice point other sections of the cable pairs or binder may not be grounded Grounding of the sheath also needs to be done properly Grounding the BRX VDSL2 devices is not sufficient to mitigate against power induction problems if the cable binde...

Page 29: ...than 25 Ohms it is highly recommended to also bond the enclosure cabinet or pedestal to the multi grounded neutral wire Figure 26 Grounding and Bonding next to Power Utility Pole Each BRX VDSL2 device mounted on a pole or installed directly on a strand are to have an effective ground It is highly recommended to bond all lead sheathed cable and the shields of plastic sheathed cable together and bon...

Page 30: ...fluence is when AC voltage appears on Tip Ring or Ring Ground or Tip Ground Another potential problem is that copper pairs may not have been properly balanced An unbalanced pair is more susceptible to Power induction and noise Based on the extensive field testing of the BRX VDSL2 performed with Operators in very different regions markets and countries it has become obvious that the Impulse Noise P...

Page 31: ...easured between TIP and RING on the DSLAM pair at the BRX VDSL2 should be greater than 35Vdc If any of these measurements are not met you should make the corrections as per your corporate standard procedure and re verify 2 The user CPE loses synchronization with the DSLAM after the link was stable for at least several minutes You should have the following equipment to help you troubleshoot the pro...

Page 32: ...se note that the BRX VDSL2 X series of VDSL2 amplifiers require the use of the Positron BRX Power Injector to properly support concurrent operation with a POTS service 4 The user CPE loses synchronization with the DSLAM when the phone goes on hook When going on hook it may cause a small impulse on the line make sure you have INP enable in the DSLAM Recommendation US 1 symbol DS 2 symbols B Perform...

Page 33: ...nce of other VDSL2 pairs in the same binder is negatively impacted The BRX VDSL2 does impact adjacent copper pairs in the same binder when some pairs downstream from the location of the BRX VDSL2 are not amplified Although the amplified signal from the BRX VDSL2 is fully compliant with the allowed spectrum mask defined for VDSL2 the interference is the result of the amplified signal impacting the ...

Page 34: ...h downstream and or upstream Verify the DSLAM settings for each pair in the bonding group and make sure they are the same Verify the loop length of each pair Significant differences between pairs will induce jitter latency which will impact the achievable total bandwidth All pairs in the bonding group need to be amplified by a BRX VDSL2 module device at the same location If any of these measuremen...

Page 35: ...may be issue in the cabling from the BRX VDSL2 to the NID Note please note that the BRX VDSL2 X series of VDSL2 amplifiers require the use of the Positron BRX Power Injector to properly support concurrent operation with a POTS service If any of the above measurements are not met you should make the corrections as per your corporate standard procedure and re verify 13 The telephone POTS does not ri...

Page 36: ...ot common 60Hz noise may convert as audible noise on the line Verify that the longitudinal balance is greater than 60dB Verify that the Power Noise measured on the line is lower than 80dBrnc Verify that the Circuit Noise measured on the line is lower than 20dBrnc Verify that the BRX VDSL2 chassis grounding is properly made Bad grounding may reduce unit shielding efficiency and translate into highe...

Page 37: ...formation can be found in your Positron Access customer web portal http www positronaccess com Portal php Positron Access Solutions Sales Pricing Availability and Technical Support US and Canada 1 888 577 5254 International 1 514 345 2220 customerservice positronaccess com Repair and Return Address Contact Customer Service prior to returning equipment to Positron Telephone US and Canada 1 888 577 ...

Page 38: ...h solid state primary lightning protection enclosed in IP65 enclosure BRX VDSL2 24 BRX VDSL2 24 pair enclosure for up to 12 BRX VDSL2 M modules with solid state primary lightning protection enclosed in IP65 enclosure BRX VDSL2 X 1 BRX VDSL2 X high power 1 pair module with solid state primary lightning protection enclosed in IP65 enclosure BRX VDSL2 X 2 BRX VDSL2 X high power 2 pair module with sol...

Page 39: ...e is a direct relation between INPMin and symbol rate such that higher values of INPMin will restrict the DSL circuit to a lower maximum bit rate This relationship is dependent in part on the interleaving capabilities of the DSL chipsets at both ends of the DSL line S D framing parameters and interleaving memory There is also a relationship between INPMin and the delay incurred as higher INPMin va...

Page 40: ...ad that will exist on the line The tables below from ITU T G 992 5 Annex K illustrate how the net data rate is affected as the INP Min and Max delay are varied The bitrates in these tables represent theoretical maximums which are not necessarily achievable with real DSL equipment but rather provide guidance to theoretical ceilings in bitrates for the corresponding parameters Service Providers are ...

Page 41: ...BRX VDSL2 User Guide 40 180 0153 001 R02 Table 13 Maximum Downstream Attainable Rate with 24K Interleaving and Extended Framing Parameters ...

Page 42: ...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 ...

Page 43: ...led S 1 2 Enabled SRA Enabled SRA Downshift Interval 30 seconds SRA Upshift Interval 30 seconds Parameter DOWNSTREAM UPSTREAM Maximum Bitrate 100 Mbps 50 Mbps Minimum Bitrate 32 Kbps 32 Kbps Maximum Delay 8 msec 8 msec Impulse Noise Protection INP 2 1 Maximum SNR Margin 16 0 dB 16 0 dB Target SNR Margin 8 0 dB 8 0 dB Minimum SNR Margin 2 0 dB 2 0 dB SNR Margin Upshift 9 0 dB 9 0 dB SNR Margin Down...

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