Benefits; Restrictions - Cisco 2620 Configuration Manual

Configuring 1-Port ADSL WAN Interface Card
Note
ADSL is a last-mile access technology, which has an asymmetrical data rate running over a single copper
wire pair.

Benefits

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Restrictions

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Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
3-30
Enables business class broadband service with voice integration, scalable performance, flexibility,
and security.
Aggregates both ADSL and other transport options into a single box.
Provides both POTS and ADSL high-speed digital data transmissions between the customer
premises equipment (CPE) and the central office (CO).
Supports ITU G.992.1 (or G.DMT, which specifies full-rate ADSL).
Supports and complies with ANSI T1.413 issue 2, and ITU G.992.1 (G.DMT for full-rate ADSL).
Supports ATM AAL2 and AAL5 services on the Cisco 2600 series and Cisco 3600 series platforms.
Supports applications (including VoATM voice), ATM class of service, variable bit rate-nonreal
time [VBR-NRT], variable bit rate-real time [VBR-rt], and unspecified bit rate [UBR]) and up to
23 virtual circuits on a WIC.
Provides ATM traffic management to enable service providers to manage their core ATM network
infrastructures.
The ADSL WAN interface card does not support dual latency. When the ADSL link is intended to
support both voice and data traffic simultaneously, the link should be configured for either all
fast-path data or all interleave data with an interleave depth of zero to insure that latency is
minimized. In addition, the total supported data rate must be reduced to adjust for the reduced
coding gain, which is usually present with high-latency traffic.
The ADSL WAN interface card does not support available bit rate (ABR) class of service (CoS).
For the Cisco 2600 series routers, the ADSL WAN interface card should be inserted only into
on-board WIC slots or 2W network modules. This card does not function properly in older network
modules.
For the Cisco 3600 series routers, the ADSL WAN interface card should be inserted only into
onboard WIC slots or 2W, 1FE2W, 2FE2W, or 1FE1R2W network modules. This card does not
function properly in older network modules.
When using AAL2, analog voice is not supported. Voice calls should come through a digital voice
card, such as the NM-HDV.
VoATM is supported in both AAL2 and AAL5 modes on the Cisco 2600 series and Cisco 3600
series routers.
VoATM AAL2 and AAL5 are supported only if voice and data use separate permanent virtual
circuits (PVCs).
VoATM AAL2 supports digital voice (T1/E1) only, while VoATM AAL5 supports both analog and
digital voice.
VoIP is not supported unless the ADSL WIC carries only voice traffic (with no data). The QoS
features necessary for VoIP and data sharing the same PVC, or different PVCs on the same interface,
are not supported yet. These features include LLQ, LFI, and tx-ring tuning.
Chapter 3 Configuring with the Command-Line Interface
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