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Configuring an ATM-over-SHDSL Interface with Quick Configuration

The ATM-over-SHDSL Quick Configuration pages allow you to configure ATM-over-SHDSL interfaces and SHDSL options.

To configure an ATM-over-SHDSL interface with Quick Configuration:

  1. In the J-Web interface, select Configure>Interfaces.

    A list of the network interfaces installed on the device is displayed. (For information about interface names, see the JUNOS Enhanced Services Interfaces and Routing Configuration Guide.)

  2. Select an at-pim/0/port interface from the list.

    The ATM-over-SHDSL Interface Quick Configuration page is displayed, as shown in Figure 17.

    Figure 17: ATM-over-SHDSL Interfaces Quick Configuration Main Page

    ATM-over-SHDSL Interfaces
Quick Configuration Main Page

  3. Enter information into the ATM-over-SHDSL Quick Configuration page, as described in Table 100.
  4. From the ATM-over-SHDSL Quick Configuration main page, click one of the following buttons:
  5. To verify the ATM-over-SHDSL interface properties, see the JUNOS Enhanced Services Interfaces and Routing Configuration Guide.

Table 100: ATM-over-SHDSL Interface Quick Configuration Pages Summary



Your Action

Configuring Logical Interfaces

Logical Interface Name

Lists the logical interfaces for the ATM-over-SHDSL physical interface.

If you have not added an at-pim/0/port interface, click Add and enter the information required in the Interfaces Quick Configuration fields.

If you have already configured a logical interface, select the interface name from the Logical Interface Name list.

To delete a logical interface, select the interface and click Delete.

Adding or Editing a Logical Interface

Add logical interfaces

Defines one or more logical units that you connect to this physical ADSL interface.

Click Add.

Logical Interface Description

(Optional) Describes the logical interface.

Type a text description of the logical interface to clearly identify it in monitoring displays.


Specifies the type of encapsulation on the SHDSL logical interface.

From the list, select one of the following types of encapsulations.

For ATM-over-SHDSL interfaces that use inet (IPv4) protocols only, select one of the following:

  • Cisco-compatible ATM NLPID—Use Cisco NLPID encapsulation.
  • ATM NLPID—Use ATM network layer protocol identifier (NLPID) encapsulation.
  • ATM PPP over AA5/LLC—Use AAL5 logical link control (LLC) encapsulation.
  • ATM PPP over raw AAL5—Use AAL5 multiplex encapsulation.
  • ATM LLC/SNAP—For interfaces that carry IPv4 traffic, use ATM over logical link control (LLC) encapsulation. You cannot configure multipoint interfaces if you use this type of encapsulation.
  • ATM VC multiplexing—Use ATM virtual circuit multiplex encapsulation.

For other encapsulation types on the ATM-over-SHDSL interfaces, select one of the following:

  • Ethernet over ATM (LLC/SNAP)—Use ATM subnetwork attachment point (SNAP) encapsulation.
  • PPPoE over ATM (LLC/SNAP)—Use PPP over Ethernet over ATM LLC encapsulation. When you use this encapsulation type, you cannot configure the interface address. Instead you configure the interface address on the PPP interface.


Configures the ATM virtual circuit identifier (VCI) for the interface.

In the VCI box, type the number for the VCI.

Add IPv4 address prefixes and destinations

Specifies one or more IPv4 addresses and destination addresses.

Click Add.

IPv4 Address Prefix

Specifies an IPv4 address for the interface.

Type an IPv4 address and prefix. For example:

Destination Address

Specifies the destination address.

  1. Type an IPv4 address for the destination.

  2. Click OK.
Configuring Physical Properties

Physical Interface Description

Describes the physical interface description information. (Optional)

Type a description of the interface.

MTU (bytes)

Specifies the maximum transmission unit (MTU) size, in bytes, of a packet on the ATM-over-SHDSL interface.

Type a value for the byte size—for example, 1500.


Selects the type of encapsulation for traffic on the physical interface.

Select one of the following types of encapsulation:

  • ATM permanent virtual circuits—Use this type of encapsulation for PPP over ATM (PPPoA) over SHDSL interfaces. This is the default encapsulation for ATM-over-SHDSL interfaces.
  • Ethernet over ATM encapsulation—Use this type of encapsulation for PPP over Ethernet (PPPoE) over ATM-over-SHDSL interfaces that carry IPv4 traffic.


Configures the ATM virtual path identifier (VPI) for the interface.

In the VPI field, type a number between 0 and 255—for example, 25.

Configuring SHDSL Options

PIC Mode

Specifies the mode on the ATM-over-SHDSL interface.

Select either of the following:

  • 1-port-atm—1-port four-wire mode
  • 2-port-atm—2-port two-wire mode


Specifies the type of annex for the interface.

Annex defines the System Reference Model for connecting DSL networks to the plain old telephone service (POTS).

Select one of the following:

  • Annex A—Used in North American network implementations.
  • Annex B—Used in European network implementations.

Line Rate

Specifies the available line rates, in kilobits per second, to use on an G.SHDSL interface.

Select the appropriate value.

For 2-port-atm mode only, you can select auto, which automatically selects a line rate.


Specifies the type of loopback testing for the interface.

Loopback testing is a diagnostic procedure in which a signal is transmitted and returned to the sending device after passing through all or a portion of a network or circuit. The returned signal is compared with the transmitted signal in order to evaluate the integrity of the equipment or transmission path. TEST

Select one of the following:

  • local—Used for testing the SHDSL equipment with local network devices.
  • payload—Used to command the remote configuration to send back the received payload.
  • remote—Used to test SHDSL with a remote network configuration.

Current SNR Margin



Specifies the signal-to-noise ratio (SNR) margin or disables SNR.

To disable Current SNR Margin, select Disable.

To configure a specific value, type a number from 0 to 10—for example, 5.

The range is 0 dB to 10 dB with a default value of 0.




Sets a value, from –10 dB to 10 dB, for the self-near-crosstalk (SNEXT) SNR margin, or disables SNEXT.

To disable SNEXT SNR Margin, select Disable.

To configure a specific value, type a number from –10 to 10—for example, 5.

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