Positron BRX-VDSL2-24 User manual

Document 180-0179-001 R02
BRX-VDSL2-24
24-pair Sealed Enclosure
Quick Start Guide
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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-Blue / Black Orange
7 13 (left side), 14 (right side) Black-Green / Black-Brown
8 15 (left side), 16 (right side) Black-Slate / Yellow-Blue
9 17 (left side), 18 (right side) Yellow-Orange / Yellow-Green
10 19 (left side), 20 (right side) Yellow-Brown / Yellow-Slate
11 21 (left side), 22 (right side) Violet-Blue / Violet-Orange
12 (bottom slot) 23 (left side), 24 (right side) Violet-Green / Violet-Brown
24 pairs to the
subscriber (CPE) Grounding Lug 24 pairs to the DSLAM
* Shown with optional Gas Tube Protection Module

Document 180-0179-001 R02
IMPORTANT NOTE: The BRX-VDSL2 unit is powered from the Sealing Current
found on a standard POTS pair. Each pair of the BRX-VDSL2-24 is powered
independently with each pair requiring the presence of the -48Vdc sealing
current for proper operation. The BRX-VDSL2-24 will not operate on a dry pair
(line with no -48Vdc sealing current). You can use the Positron BRX Power
Injector to provide the -48Vdc sealing current when operating on dry pairs.
Connecting the BRX-VDSL2-24
Step 1: Select the location where the BRX-VDSL2-24 will be inserted using the BRX Cloud
Calculator for the longest loop that requires amplication.
Step 2: Connect the grounding lug of the unit to a proper ground (usually available near the
splice point).
Step 3: Insert a BRX-BYPASS-TEST module in slot 1 and ensure that both switches are in
BYPASS mode.
Step 4: Connect the rst two (2) pairs to be amplied to the rst two (2) pairs of the BRX-VDSL2-24.
Make sure to match the DSLAM pair color to the CPE pair color.
Step 5: Test for continuity between the DSLAM pair and CPE pair at the splice point. If a pair
is powered with a -48Vdc sealing current, the corresponding LED on the BRX-BYPASS-TEST
module will be ON. If either circuit is not powered, a continuity test will conrm that the pair is
spliced properly (no open, short or ground fault) but you will need to verify the DSLAM is able to
provide the current. If operating on a dry pair, you should use a BRX Power Injector.
Step 6: Replace the BRX-BYPASS-TEST module with a BRX-VDSL2-M module. The
correspondent DS LED will turn GREEN to conrm presence of -48Vdc sealing current and
proper operation. The US LED currently not used.
Step 7: The DSLAM and CPE will now retrain the circuit and bring up the ADSL2+ / ADSL link
with the amplied bandwidth. The performance may be limited (or capped) by a setting in the
DSLAM and/or BRAS conguration.
Step 8: Repeat steps 3 to 7 for the eleven (11) slots of the BRX-VDSL2-24
Placement Guidelines for BRX-VDSL2 Devices
The BRX-VDSL2 amplies VDSL2 loops and supports proles 17a, 8a, 8b and 8d. It is
designed to deliver solid amplication of the loops as long as the BRX-VDSL2 device is
installed within 45% to 60% of the total loop distance. It is recommended to install the
BRX-VDSL2 unit at an existing splice point that is within the recommended placement
range. When multiple splice points exist within that range, you should select the one
that is most convenient.
The BRX-VDSL2 installation should follow these simple rules:
1. L1 - Minimum Loop Length from DSLAM to BRX-VDSL2 should be no less than
2000 feet (0.6 km) for 24 AWG (0.5 mm) gauge or 1600 feet (0.5km) for 26 AWG
(0.4 mm) gauge.
2. L2 - Minimum Loop Length from CPE to BRX-VDSL2 should be no less than
650 feet (200m) for 24 AWG (0.5mm) gauge or 500 feet (150m) for 26 AWG (0.4
mm) gauge.
For a 25 / 3 Mbps service, the recommended range is as follows (single pair):
• Maximum total loop length: 6250 feet (1.9 km) for 24 AWG (0.5mm) gauge or
5000 feet (1.5 km) for 26 WG (0.4 mm) gauge.
• Recommended placement range: 3000 to 3600 feet (0.9 to 1.1 km) of 24 AWG
(0.5mm) gauge or 2400 to 2900 feet (0.7 to 0.9 km) of 26 AWG (0.4 mm) gauge.
For a 10 / 1 Mbps service in VDSL2 mode (useful when you want to limit the use of
ADSL2+ loops inside a binder mostly used for VDSL2 loops), the recommended range
is as follows (single pair):
• Maximum total loop length: 10000 feet (3 km) for 24 AWG (0.5mm) gauge or
8000 feet (2.4 km) for 26 WG (0.4 mm) gauge.
• Recommended placement range: 4500 to 5500 feet (1.4 to 1.7 km) of 24 AWG
(0.5mm) gauge or 3600 to 4400 feet (1.1 to 1.3 km) of 26 AWG (0.4 mm) gauge.
Recommended DSLAM Settings
Parameter Downstream Upstream
Maximum Bitrate 100 Mbps 50 Mbps
Maximum Delay 8 msec 8 msec
Path Latency Interleaved
Impulse Noise Protection (INP) 2 1
Target SNR Margin 8.0 dB 8.0 dB
In order to fully benet from the amplied VDSL2 signal, there are a few DSLAM
settings to be set as per the following recommendation:
You should also make sure that the DSLAM and/or the BRAS settings are not set at a
lower level than the target service offered to the subscriber for this loop.
NOTE: You should always follow your corporate guidelines for the DSLAM settings if
they differ from the Positron recommendation. If in doubt, you should check with the
Engineering or Operation team.
The BRX Cloud Calculator can help determine the optimal installation location for
each specic loop. To access the BRX Cloud Calculator, sign up on the Positron
Access Portal at www.positronaccess.com/Portal.php. You will get a username and
password to access the Portal.
Summary Diagram of Typical Installation
DSLAM BRX-VDSL2-24
L1
Distance from DSLAM to BRX-VDSL2-24
L2
Distance from BRX-VDSL2-24 to CPE
CPE