close

keyboard_arrow_left

Table of Contents Expand all

play_arrow Overview
play_arrow Initial Configuration
- Initial Configuration on NFX150 Devices
- Zero Touch Provisioning on NFX Series Devices
play_arrow Generating YANG Files
- YANG files on NFX150 Devices
play_arrow Configuring Interfaces
play_arrow Configuring USB Pass-Through on NFX Series Devices
- Supporting File Transfer from USB on NFX Series Devices
- Installing Software on NFX Devices Using USB Autoinstallation
play_arrow Configuring Security
play_arrow Configuring VNFs
play_arrow Configuring Mapping of Address and Port with Encapsulation (MAP-E)
- Mapping of Address and Port with Encapsulation on NFX Series Devices
- Configuring MAP-E on NFX Series Devices
play_arrow Configuring High Availability
- Chassis Cluster on NFX150 Devices
- Upgrading or Disabling a Chassis Cluster on NFX150 Devices
play_arrow Configuring Service Chaining
play_arrow Monitoring and Troubleshooting
play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview

list Table of Contents

English

VDSL2 Interfaces on NFX150 Devices

date_range 24-Nov-23

arrow_backward

arrow_forward

VDSL Interface Overview

Very-high-bit-rate digital subscriber line (VDSL) technology is part of the xDSL family of modem technologies that provide faster data transmission over a single flat untwisted or twisted pair of copper wires. The VDSL lines connect service provider networks and customer sites to provide high bandwidth applications (triple-play services) such as high-speed Internet access, telephone services like VoIP, high-definition TV (HDTV), and interactive gaming services over a single connection.

VDSL2 is an enhancement to G.993.1 (VDSL) and permits the transmission of asymmetric (half-duplex) and symmetric (full-duplex) aggregate data rates up to 100 Mbps on short copper loops using a bandwidth up to 17 MHz. The VDSL2 technology is based on the ITU-T G.993.2 (VDSL2) standard, which is the International Telecommunication Union standard describing a data transmission method for VDSL2 transceivers.

The VDSL2 uses discrete multitone (DMT) modulation. DMT is a method of separating a digital subscriber line signal so that the usable frequency range is separated into 256 frequency bands (or channels) of 4.3125 KHz each. The DMT uses the Fast Fourier Transform (FFT) algorithm for demodulation or modulation for increased speed.

VDSL2 interface supports Packet Transfer Mode (PTM). The PTM mode transports packets (IP, PPP, Ethernet, MPLS, and so on) over DSL links as an alternative to using Asynchronous Transfer Mode (ATM). PTM is based on the Ethernet in the First Mile (EFM) IEEE802.3ah standard.

VDSL2 provides backward compatibility with ADSL2 and ADSL2+ because this technology is based on both the VDSL1-DMT and ADSL2/ADSL2+ recommendations.

VDSL2 Vectoring Overview

Vectoring is a transmission method that employs the coordination of line signals that reduce crosstalk levels and improve performance. It is based on the concept of noise cancellation, like noise-cancelling headphones. The ITU-T G.993.5 standard, "Self-FEXT Cancellation (Vectoring) for Use with VDSL2 Transceivers,” also known as G.vector, describes vectoring for VDSL2.

The scope of Recommendation ITU-T G.993.5 is specifically limited to the self-FEXT (far-end crosstalk) cancellation in the downstream and upstream directions. The FEXT generated by a group of near-end transceivers and interfering with the far-end transceivers of that same group is canceled. This cancellation takes place between VDSL2 transceivers, not necessarily of the same profile.

VDSL2 Network Deployment Topology

In standard telephone cables of copper wires, voice signals use only a fraction of the available bandwidth. Like any other DSL technology, the VDSL2 technology utilizes the remaining capacity to carry the data and multimedia on the wire without interrupting the line's ability to carry voice signals.

This example depicts the typical VDSL2 network topology deployed using NFX device.

A VDSL2 link between network devices is set up as follows:

Connect an end-user device such as a LAN, hub, or PC through an Ethernet interface to the customer premises equipment (CPE) (for example, an NFX device).
Connect the CPE to a DSLAM.
The VDSL2 interface uses either Gigabit Ethernet or fiber as second mile to connect to the Broadband Remote Access Server (B-RAS) as shown in Figure 1.
The ADSL interface uses either Gigabit Ethernet (in case of IP DSLAM] as the “second mile” to connect to the B-RAS or OC3/DS3 ATM as the second mile to connect the B-RAS as shown in Figure 2.

Note:
The VDSL2 technology is backward compatible with ADSL2 and ADSL2+. VDSL2 provides an ADSL2 and ADSL2+ interface in an ATM DSLAM topology and provides a VDSL2 interface in an IP or VDSL DSLAM topology.
The DSLAM accepts connections from many customers and aggregates them to a single, high-capacity connection to the Internet.

Figure 1 shows a typical VDSL2 network topology.

Figure 1: Typical VDSL2 End-to-End Connectivity and Topology Diagram

Figure 2 shows a backward-compatible ADSL topology using ATM DSLAM.

Figure 2: Backward-Compatible ADSL Topology (ATM DSLAM)

VDSL2 Interface Support on NFX Series Devices

The VDSL2 interface is supported on the NFX Series devices listed in Table 1. (Platform support depends on the Junos OS release in your installation.)

Table 1: VDSL2 Annex A and Annex B Features
Features	POTS
Devices	JNP-SFP-VDSL2
Supported annex operating modes	Annex A and Annex B*
Supported Bandplans	Annex A 998 Annex B 997 and 998
Supported standards	ITU-T G.993.2 and ITU-T G.993.5 (VDSL2)
Used in	North American network implementations
ADSL backward compatibility	G 992.3 (ADSL2) G 992.5 (ADSL2+)

Note:

Only one JNP-SFP-VDSL2 device is supported at a time.

VDSL2 Interface Compatibility with ADSL Interfaces
VDSL2 Interfaces Supported Profiles
VDSL2 Interfaces Supported Features

VDSL2 Interface Compatibility with ADSL Interfaces

VDSL2 interfaces on NFX Series devices are backward compatible with most ADSL2 and ADSL2+ interface standards. The VDSL2 interface uses Ethernet in the First Mile (EFM) mode or Packet Transfer Mode (PTM) and uses the named interface heth-0-4 and heth-0-5.

Note:

The VDSL2 interface has backward compatibility with ADSL2 and ADSL2+.
It requires around 60 seconds to switch from VDSL2 to ADSL2 and ADSL2+ or from ADSL2 and ADSL2+ to VDSL2 operating modes.

VDSL2 Interfaces Supported Profiles

A profile is a table that contains a list of pre-configured VDSL2 settings. Table 2 lists the different profiles supported on the VDSL2 interfaces and their properties.

Table 2: Supported Profiles on the VDSL2 Interfaces
Profiles	Data Rate
8a	50
8b	50
8c	50
8d	50
12a	68
12b	68
17a	100
Auto	Negotiated (based on operating mode)

VDSL2 Interfaces Supported Features

The following features are supported on the VDSL2 interfaces:

ADSL2 and ADSL2+ backward compatibility with Annex A, Annex M support
PTM or EFM (802.3ah) support
Operation, Administration, and Maintenance (OAM) support for ADSL2 and ADSL2+ modes
Multilink Point-to-Point Protocol (MLPPP) (supported only when the VDSL2 Mini-PIM is operating in ADSL2 mode)
MTU size of 1514 bytes (maximum) in VDSL2 mode and 1496 bytes in ADSL mode.
Support for maximum of 10 permanent virtual connections (PVCs) (only in ADSL2 and ADSL2+ mode)

Configuring VDSL SFP Interface Using VLANs on NFX150 Network Services Platform

Note:

Ensure that connectivity to the host is not lost during the configuration process.

To configure VDSL SFP interfaces on NFX150 devices:

Connect to the host.
```
user@host> configure
[edit]
user@host#
```

Configure the WAN side front panel port with vlan-tagging.

content_copy zoom_out_map
user@host# set interfaces virtual-interface-name vlan-tagging

content_copy zoom_out_map
user@host# set interfaces ge-1/0/1 vlan-tagging

Configure a VLAN for the WAN side front panel port.

content_copy zoom_out_map
user@host# set interfaces virtual-interface-name unit logical-unit-number vlan-id vlan-id

content_copy zoom_out_map
user@host# set interfaces ge-1/0/1 unit 0 vlan-id 151

Configure the WAN side front panel port with an IP address.

content_copy zoom_out_map
user@host# set interfaces virtual-interface-name unit logical-unit-number family inet address ip-address

content_copy zoom_out_map
user@host# set interfaces ge-1/0/1 unit 0 family inet address 151.1.1.151/24

Configure the physical (heth) interface with VDSL SFP options, VDSL profile, and carrier settings on the VDSL SFP interface.
```
user@host# vmhost interfaces physical-interface-name dsl-sfp-options vdsl-options profile profile carrier carrier 
```
```
user@host# set vmhost interfaces heth-0-4 dsl-sfp-options vdsl-options profile auto carrier auto
```
Note:
The default value for vdsl-options profile is auto. The value auto supports all profiles ranging from 8a to 17a.

The default value for vdsl-options carrier is auto. The value auto includes a43 and b43.

Map the physical (heth) interfaces to the virtual (ge) interfaces.

content_copy zoom_out_map
user@host# set vmhost virtualization-options interfaces virtual-interface-name mapping interface physical-interface-name

content_copy zoom_out_map
user@host# set vmhost virtualization-options interfaces ge-1/0/1 mapping interface heth-0-4

Commit the configuration.
```
user@host# commit and-quit
user@host> exit
```

To verify the configuration, enter the show interfaces heth-0-4 command.

content_copy zoom_out_map
[edit]
user@host# show interfaces heth-0-4
Physical interface: heth-0-4, Enabled, Physical link is Up
  Link-level type: Ethernet, Media type: Fiber, MTU: 9192, VDSL2 mode, Speed: 1Gbps, Duplex: Full-duplex, Auto-negotiation: Disabled
  VDSL status:
    Modem status  : Showtime (Auto)
    VDSL profile  : Profile-8b
  Device flags   : Present Running
  Current address: d8:b1:22:33:5e:51, Hardware address: d8:b1:22:33:5e:51

Configuring VDSL SFP Interface Without Using VLANs on NFX150 Network Services Platform

Note:

Ensure that connectivity to the host is not lost during the configuration process.

To configure VDSL SFP interfaces on NFX150 devices:

Connect to the host.
```
user@host> configure
[edit]
user@host#
```

Configure the WAN side front panel port with an IP address.

content_copy zoom_out_map
user@host# set interfaces virtual-interface-name unit logical-unit-number family inet address ip-address

content_copy zoom_out_map
user@host# set interfaces ge-1/0/1 unit 0 family inet address 151.1.1.151/24

Configure the physical (heth) interface with VDSL SFP options, VDSL profile, and carrier settings on the VDSL SFP interface.
```
user@host# vmhost interfaces physical-interface-name dsl-sfp-options vdsl-options profile profile carrier carrier 
```
```
user@host# set vmhost interfaces heth-0-4 dsl-sfp-options vdsl-options profile auto carrier auto
```
Note:
The default value for vdsl-options profile is auto. The value auto supports all profiles ranging from 8a to 17a.

The default value for vdsl-options carrier is auto. The value auto includes a43 and b43.

Map the physical (heth) interfaces to the virtual (ge) interfaces.

content_copy zoom_out_map
user@host# set vmhost virtualization-options interfaces virtual-interface-name mapping interface physical-interface-name

content_copy zoom_out_map
user@host# set vmhost virtualization-options interfaces ge-1/0/1 mapping interface heth-0-4

Commit the configuration.
```
user@host# commit and-quit
user@host> exit
```

To verify the configuration, enter the show interfaces heth-0-4 command.

content_copy zoom_out_map
[edit]
user@host# show interfaces heth-0-4
Physical interface: heth-0-4, Enabled, Physical link is Up
  Link-level type: Ethernet, Media type: Fiber, MTU: 9192, VDSL2 mode, Speed: 1Gbps, Duplex: Full-duplex, Auto-negotiation: Disabled
  VDSL status:
    Modem status  : Showtime (Auto)
    VDSL profile  : Profile-8b
  Device flags   : Present Running
  Current address: d8:b1:22:33:5e:51, Hardware address: d8:b1:22:33:5e:51

arrow_backward PREVIOUS ADSL2 and ADSL2+ Interfaces on NFX150 Devices

NEXT arrow_forward Configuring the LTE Module on NFX Devices

How to Configure the NFX150

ON THIS PAGE

VDSL2 Interfaces on NFX150 Devices

VDSL Interface Overview

VDSL2 Vectoring Overview

VDSL2 Network Deployment Topology

VDSL2 Interface Support on NFX Series Devices

VDSL2 Interface Compatibility with ADSL Interfaces

VDSL2 Interfaces Supported Profiles

VDSL2 Interfaces Supported Features

Configuring VDSL SFP Interface Using VLANs on NFX150 Network Services Platform

Configuring VDSL SFP Interface Without Using VLANs on NFX150 Network Services Platform

Stay in touch

Helped me install or use the product
Accelerated my deployment

Discuss the product with a co-worker
Make a purchase inquiry