Atm And Dsl Interface Configuration - 3Com MSR 50 Series Configuration Manual

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ATM and DSL Interface
ATM
AND
C
ONFIGURATION
When configuring ATM/DSL interface, go to these sections for information you are
interested in:
"ATM and DSL Interface" on page 71
■
"IMA-E1/T1 Interface Configuration" on page 72
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"ATM E3/T3 Interface Configuration" on page 76
■
"ATM OC-3c/STM-1 Interface Configuration" on page 76
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"ADSL Interface Configuration" on page 77
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"G.SHDSL Interface Configuration" on page 80
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"Displaying and Maintaining ATM and DSL Interfaces" on page 81
■
"Troubleshooting" on page 81
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This section covers these topics:
"ATM and DSL" on page 71
■
"ATM interfaces available for the low-end and mid-range routers" on page 72
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"ATM interface features" on page 72
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ATM and DSL
Asynchronous transfer mode (ATM) is a backbone network technology for
transmission of audio, video, and computer data. By virtue of its flexibility and
support to multimedia services, ATM is regarded as the core technology for
implementing broadband communications.
Digital subscriber line (DSL) is a technology providing high-speed data transmission
over the copper wire. It includes 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),
and symmetric digital subscriber line (SDSL). These DSL technologies are different
in signal transmission speed and distance and uplink/downlink rate symmetric
mode (that is, whether uplink and downlink rates are the same).
The ATM physical layer lies at the bottom of the ATM reference model. Though it
is concerned with transmission media, its functionality does not rely on the
transmission mechanism and speed of specific medium. Rather, 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, ATM E3/T3, and IMA-E1/T1.
Most DSL applications are ATM-based, combining the advantages of ATM with the
DSL I
NTERFACE