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ATM-overSHDSL

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):

ITU G.991.2, Single-pair High-speed Digital Subscriber Line (SHDSL) Transceiver
ITU G.994.1, Handshake Procedures for Digital Subscriber Line (DSL) Transceivers
ITU G.997.1, Physical Layer Management for Digital Subscriber Line (DSL) Transceivers
RFC 3276, Definitions of Managed Objects for High Bit-Rate DSL - 2nd generation (HDSL2) and Single-Pair High-Speed Digital Subscriber Line (SHDSL) Lines

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.

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