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Configuring ATM-over-SHDSL Interfaces

The symmetric high-speed digital subscriber line (SHDSL) Physical Interface Module (PIM) is available for J-series Services Routers. The PIM supports multi-rate, high-speed, symmetrical digital subscriber line technology for data transfer between a single customer premises equipment (CPE) subscriber and a central office (CO). Unlike ADSL, which was designed for delivering more bandwidth downstream than upstream, SHDSL is symmetrical and delivers a bandwidth of 2.3 Mbps in both directions. The SHDSL PIM has 2 ports and supports ATM-over-SHDSL mode only.

SHDSL is defined in the following specifications from the ITU and the Internet Engineering Task Force (IETF):

J-series Services Routers with SHDSL Annex A or Annex B PIMs act as a primary WAN link. They use an ATM interface to send network traffic through a point-to-point connection to a DSL-access multiplexer (DSLAM). You can configure Point-to-Point Protocol over Ethernet (PPPoE) over ATM to connect through DSL lines. For more information about configuring PPPoE, see Configuring PPPoE.

ATM-over-SHDSL interfaces are not supported on J2300 Services Routers.

Note: You can configure J-series Services Routers with SHDSL PIMs for connections through SHDSL only, not for direct ATM connections.

To configure the ATM mode for SHDSL, include the pic-mode statement at the [edit chassis fpc fpc-number pic 0 shdsl] hierarchy level:

[edit chassis]
fpc fpc-number {
pic 0 {
shdsl {
pic-mode (1-port-atm | 2-port-atm);
}
}
}

For more information about configuring the ATM mode, see the JUNOS System Basics Configuration Guide and the J-series Services Router Advanced WAN Access Configuration Guide.

To configure SHDSL operating mode on the physical ATM interface and set the encapsulation, include the shdsl-options statement and the encapsulation statement at the [edit interfaces at-pim/0/port] hierarchy level:

[edit interfaces at-pim/0/port]
shdsl-options {
annex (annex-a | annex-b);
line-rate line-rate;
loopback (local remote);
snr-margin {
current margin;
snext margin;
}
encapsulation (atm-pvc | ethernet-over-atm)
}

To configure ATM virtual path identifier (VPI) options for the interface, include the vpi statement at the [edit interfaces interface-name atm-options] hierarchy level:

[edit interfaces interface-name]
atm-options {
vpi vpi-identifier {
maximum-vcs maximum-vcs;
oam-liveness {
up-count cells;
down-count cells;
}
oam-period (disable | seconds);
}
}

For more information about configuring ATM VPI options, see Configuring the Maximum Number of ATM1 VCs on a VP.

To configure logical interface properties, include the encapsulation statement, family statement, and vci statement:

unit logical-unit-number {
encapsulation type;
family inet {
vci vpi-identifier.vci-identifier;
}
}

You can include these statements at the following hierarchy levels:

This chapter includes the following topics:

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