Configuring ATM-over-SHDSL 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.

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.

Encapsulation

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.

VCI

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:

10.10.10.10/24

Destination Address

Specifies the destination address.

1. Type an IPv4 address for the destination.

2. Click OK.

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.

Encapsulation

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.

VPI

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

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

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

Annex

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.

Loopback

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

Disable

Value

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.

SNEXT SNR Margin

Disable

Value

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.

Navigate to the Chassis level in the configuration hierarchy.

1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
2. Next to Chassis, click Configure.

From the [edit] hierarchy level, enter

set chassis fpc 6 pic 0 shdsl pic-mode 1-port-atm

Set the ATM-over-SHDSL mode on the G.SHDSL interface, if required. By default, G.SHDSL interfaces are enabled in two-wire Annex B mode. To configure the four-wire mode on the G.SHDSL interface, follow the tasks in this table.

1. Next to Fpc, click Add new entry.
2. In the Slot box, type 6.
3. Next to Pic, click Add new entry.
4. In the Slot box, type 0.
5. Next to Shdsl, click Configure.
6. From the Pic mode menu, select 1-port-atm.
7. Click OK until you return to the main Configuration page.

Navigate to the Interfaces level in the configuration hierarchy.

On the main Configuration page next to Interfaces, click Edit.

From the [edit] hierarchy level, enter

edit interfaces at-2/0/0

Create the new interface—for example, at-2/0/0.

1. Next to Interface, click Add new entry.
2. In the Interface name box, type at-2/0/0.
3. Click OK.

Configure ATM virtual path identifier (VPI) options for the interface—for example, at-2/0/0.

• ATM VPI—A number between 0 and 255—for example, 25.
• Operation, Maintenance, and Administration (OAM) F5 loopback cell thresholds (“liveness”) on ATM virtual circuits. The range is between 1 and 255, and the default is 5 cells.
  • Down count—Number of consecutive OAM loopback cells an ATM virtual circuit must lose to be identified as unavailable—for example, 200.
  • Up count—Number of consecutive OAM loopback cells an ATM virtual interface must receive to be identified as operational—for example, 200.
• OAM period—Interval, in seconds, at which OAM cells are transmitted on ATM virtual circuits—for example, 100. The range is between 1 and 900 seconds.

1. In the Interface name box, select at-2/0/0.
2. Next to Atm options, click Configure.
3. Next to Vpi, click Add new entry.
4. In the Vpi number box, type 25.
5. Click OK.
6. In the Actions box, click Edit.
7. Next to Oam liveness, click Configure.
8. In the Down count box, type 200.
9. In the Up count box, type 200.
10. Click OK.
11. Next to Oam period, click Configure.
12. From the Oam period choices list, select Oam period.
13. In the Oam period box, type 100.
14. Click OK until you return to the Interface page.

1. To configure the VPI value, enter

   set atm-options vpi 25

2. To configure OAM liveness values on a VPI, enter

   set atm-options vpi 25 oam-liveness up-count 200 down-count 200

3. To configure the OAM period, enter

   set atm-options vpi 25 oam-period 100

Configure the encapsulation type—for example, ethernet-over-atm.

• atm-pvc—ATM permanent virtual circuits is the default encapsulation for ATM-over-SHDSL interfaces.

  For PPP over ATM (PPPoA) over SHDSL interfaces, use this type of encapsulation.

• ethernet-over-atm—Ethernet over ATM encapsulation.

  For PPP over Ethernet (PPPoE) over ATM-over-SHDSL interfaces that carry IPv4 traffic, use this type of encapsulation.

From the Encapsulation list, select ethernet-over-atm.

Enter

set encapsulation ethernet-over-atm

Set the annex type.

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

1. Next to Shdsl options, click Configure.
2. From the Annex list, select Annex-a.

Enter

set shdsl-options annex annex-a

Configure the SHDSL line rate for the ATM-over-SHDSL interface–for example, automatic selection of the line rate.

The following values are available:

• auto—Automatically selects a line rate. This option is available only in two-wire mode and is the default value.
• 192 Kbps or higher—Speed of transmission of data on the SHDSL connection.

In the four-wire mode, the default line rate is 4608 Kbps.

From the Line Rate list, select auto.

Enter

set shdsl-options line-rate auto

Configure the loopback option for testing the SHDSL connection integrity–for example, local loopback.

The following values are available:

• 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.

From the Loopback list, select local.

Enter

set shdsl-options loopback local

Configure the signal-to-noise ratio (SNR) margin—for example, 5 dB for either or both of the following thresholds:

• current—Line trains at higher than current noise margin plus SNR threshold. The range is 0 to 10 dB. The default value is 0.
• snext—Line trains at higher than self-near-end crosstalk (SNEXT) threshold. The default value is disabled.

Setting the SNR creates a more stable SHDSL connection by making the line train at a SNR margin higher than the threshold. If any external noise below the threshold is applied to the line, the line remains stable. You can also disable the SNR margin thresholds.

1. Next to Snr margin, select Yes, then click Configure.
2. From the Current list, select Enter Specific Value.
3. In the Value box, type 5.
4. From the Snext list, select Enter Specific Value.
5. In the Value box, type 5.
6. Click OK until you return to the Interface page.

1. Enter

   set shdsl-options snr-margin current 5

2. Enter

   set shdsl-options snr-margin snext 5

Add the logical interface.

Set a value from 0 and 16385—for example, 3.

Add other values if required by your network.

1. Scroll down the page to Unit, and click Add new entry.
2. In the Interface unit number box, type 3.
3. Enter other values in the fields required by your network.

Enter

set unit 3

Configure encapsulation for the ATM-for-SHDSL logical unit—for example, atm-nlpid.

The following encapsulations are supported on the ATM-over-SHDSL interfaces that use inet (IP) protocols only:

• atm-vc-mux—Use ATM virtual circuit multiplex encapsulation.
• atm-nlpid—Use ATM network layer protocol identifier (NLPID) encapsulation.
• atm-cisco-nlpid—Use Cisco NLPID encapsulation.
• ether-over-atm-llc—For interfaces that carry IPv4 traffic, use Ethernet over LLC encapsulation. You cannot configure multipoint interfaces if you use this type of encapsulation.

The following encapsulations are supported on the ATM-over-SHDSL for PPP-over-ATM (PPPoA) interfaces only. (For a sample PPPoA configuration, see Verifying Interface Configuration.)

• atm-ppp-llc—AAL5 logical link control (LLC) encapsulation.
• atm-ppp-vc-mux—Use AAL5 multiplex encapsulation.

Other encapsulation types supported on the ATM-over-SHDSL interfaces:

• ppp-over-ether-over-atm-llc—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.
• atm-snap—Use ATM subnetwork attachment point (SNAP) encapsulation.

From the Encapsulation list, select atm-nlpid.

Enter

set unit 3 encapsulation atm-nlpid

Configure Operation, Maintenance, and Administration (OAM) options for ATM virtual circuits:

• OAM F5 loopback cell thresholds (“liveness”) on ATM virtual circuits. The range is between 1 and 255, and the default is 5 cells.
  • Down count—Number of consecutive OAM loopback cells an ATM virtual circuit must lose to be identified as unavailable—for example, 200.
  • Up count—Number of consecutive OAM loopback cells an ATM virtual interface must receive to be identified as operational—for example, 200.
• OAM period—Interval, in seconds, at which OAM cells are transmitted on ATM virtual circuits—for example, 100. The range is between 1 and 900 seconds.

1. Next to Oam liveness, click Configure.
2. In the Down count box, type 200.
3. In the Up count box, type 200.
4. Click OK.
5. Next to Oam period, click Configure.
6. From the Oam period choices list, select Oam period.
7. In the Oam period box, type 100.
8. Click OK.

1. To configure OAM liveness values for an ATM virtual circuit, enter

   set unit 3 oam-liveness up-count 200 down-count 200

2. To configure the OAM period, enter

   set unit 3 oam-period 100

Add the Family protocol type—for example, inet.

1. In the Inet box, select Yes and click Configure.
2. Enter the values in the fields required by your network.
3. Click OK.

Enter

set unit 3 family inet

Commands vary depending on the protocol type.

Configure ATM virtual channel identifier (VCI) options for the interface.

• ATM VCI type—vci.
• ATM VCI value—A number between 0 and 4089—for example, 35—with VCIs 0 through 31 reserved.

1. From the Vci type list, select vci.
2. In the Vci box, type 35.
3. Click OK until you return to the Interfaces page.

1. To configure the VCI value, enter

   set unit 3 vci 35