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Many customers require IP QoS to differentiate between high- and low-priority traffic. The Cisco 1700 with G.shdsl WIC
supports VoIP over DSL with IP QoS map to ATM CoS. These enhanced QoS features enable data and voice traffic to be
transmitted on the same virtual circuit, thus allowing for further reduction of monthly recurring WAN charges.
Support for Analog and Digital Voice Interfaces
Cisco 175x (1750 and 1751) routers feature one voice-interface-card (VIC) slot and two WAN/voice-interface-card (WIC/
VIC)slots. Cisco1751 VICsinclude dual-portforeign exchangestation (FXS),foreign exchangeoffice (FXO),ear andmouth
(E&M),and direct inward dial (DID), all of which provide the analog voice interface to legacy telephony equipment(phones,
fax, private branch exchange [PBX], and key telephone system [KTS]) and the Public Switched Telephone Network (PSTN).
It provides users a cost-effective way to migrate toward a packet-based multiservice infrastructure without deeming legacy
telephonyequipment obsolete. Cisco 1751 supportsdigital voice with dual-port ISDN Basic Rate Interface(BRI) NT/TE VIC
(network and user-side Q.931 BRI). This enables users to easily connect ISDN PBXs and KTSs to a multiservice network
with a minimum of configuration changes on the PBX. In addition, users can immediately take full advantage of multiservice
capabilities, such as telephony toll-bypass applications and full gateway integration within Cisco AVVID (Architecture for
Voice, Video and Integrated Data). The Cisco 1750 does not support digital voice interfaces (BRI) or analog DID, but does
support the other voice interfaces referenced in this section.
Standards-Based Voice Technology
The voice functionality of the Cisco 1700 with the G.shdsl WIC, which is based on H.323 standards, enables third parties
to develop applications to a standard protocol. This results in an ecosystem of compatible voice applications such as
enhanced call control via gatekeepers, service billing, and network management. Such an ecosystem provides a complete
solution for rapid deployment of intranet voice services for branch offices and enterprise teleworkers.
DSLAM Interoperability
The G.shdsl is based on the Globespan chipset and operates either back to back or connected to a Cisco 6160 and 6260
DSLAM. Interoperability testing with third-party vendors’ DSLAMs is likely to be conducted on an ongoing basis.
Additional information on this will be provided when testing is completed.
Customers can deploy G.shdsl WICs in a back-to-back configuration to take advantage of existing copper wiring in a
building, campus, or neighborhood whereDSLAM aggregation equipment is either not needed or not financially justified. In
back-to-back mode, one side of the connection is configured in server mode and provides functionality similar to that of a
DSLAM.
Quality of Service
IP QoS
The Cisco 1700 with the G.shdsl WIC supports the integration of voice and data over the same G.shdsl circuit using VoIP,
thusallowing for further reduction of monthly recurring WAN charges. EnhancedQoS is offered through mapping of IP QoS
to ATM CoS features. Table 1 lists the QoS features and their benefits.