Configuring ATM interfaces
ATM interface features are applicable to routers installed with ATM-OC3, ADSL2+, G.shdsl, or
G.shdsl.Bis interface cards.
Overview
ATM and DSL
Asynchronous Transfer Mode (ATM) is a technology based on packet transmission mode and
incorporates the high-speed of circuit transmission mode. It is a backbone network technology for
transmission of audio, video, and data. Because of its flexibility and support for multimedia services,
ATM is regarded as a core technology for implementing broadband communications.
Digital Subscriber Line (DSL) is a technology providing high-speed data transmission over copper wires.
It includes the following technologies:
• Asymmetric Digital Subscriber Line (ADSL)
• High-bit-rate Digital Subscriber Line (HDSL)
• Very High-rate Digital Subscriber Line (VDSL)
• Single-pair high-speed DSL defined in ITU-T Standard G.991.2 (G.SHDSL)
• Symmetric Digital Subscriber Line (SDSL)
These DSL technologies are different in signal transmission speed and distance and link rate symmetric
mode (determined by the uplink and downlink rates).
The ATM physical layer is at the bottom of the ATM reference model. It primarily delivers valid cells and
the associated timing signals between the upper layer and transmission medium. The speeds of physical
access media are defined in international standards such as ATM OC-3c/STM-1. Most DSL applications
are ATM-based, combining the advantages of ATM with the low transmission cost feature of DSL. DSL
technologies have been widely adopted for broadband access.
ATM interface types
The device supports the following ATM interface types:
• ATM OC-3c/STM-1 based on SONET/SDH.
• ATM ADSL based on ADSL technology.
• ATM G.SHDSL based on G.SHDSL technology.
These interfaces support IPoA, IPoEoA, PPPoA, and PPPoEoA. For more information, see Layer 2—WAN
Configuration Guide.
ATM interface features
ATM interfaces support the following features:
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