Table Of Contents
Integrated Voice/Data/Video Broadband Access
Basic Voice Transport Services
Regulatory and Tandem Feature Support
Integrated Routing Functionality
Electrical, Safety, and Standards Compliance
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Data Sheet
Cisco MGX 8000 Series
Carrier Voice Gateways
The Cisco MGX® 8000 Series Carrier Voice Gateways are high capacity carrier-class voice gateways that offer standards-based support for voice over IP (VoIP) and voice over ATM (VoATM) services. The Cisco MGX 8000 Series Carrier Voice Gateways consist of the Voice Interworking Service Module (VISM) deployed in the Cisco MGX 8230, 8830, 8250, and 8850 Advanced ATM Multiservice Switches. The Cisco MGX 8000 Series Carrier Voice Gateways combine the industry's highest quality packet voice with the extensible architecture and the proven network availability of the Cisco MGX 8000 Advanced ATM Multiservice Portfolio (AAMP).
Figure 1
The Cisco MGX 8000 Series Carrier Voice Gateways
Key FeaturesThe Cisco MGX 8000 Series Carrier Voice Gateway incorporates high-performance switching, full Layer 2 and Layer 3 networking capabilities, narrowband interfaces, broadband interfaces, and integrated voice modules. Some of the key features that support these capabilities include:
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Support for standards-based Voice over IP (VoIP) and Voice over ATM (VoATM)
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Key ApplicationsVoice Trunking for Mobile Wireless NetworksMobile wireless service providers worldwide have generally been using expensive leased lines for interconnecting their Mobile Switching Centers (MSCs), but the Cisco MGX 8000 Series Carrier Voice Gateway can provide a more cost-effective alternative. With its standards-based ATM adaption layer 2 (AAL2) capabilities for VoATM networks, the Cisco MGX 8000 Series Carrier Voice Gateway enables mobile wireless service providers to move all their inter-MSC voice traffic onto a packet network. Such a migration will reduce cost by up to 80 percent of their current rate through use of compression, voice activity detection (VAD), and AAL2 subcell multiplexing, while guaranteeing the transparency of existing voice services. With the addition of a softswitch, service providers can migrate to switched voice and further reduce the complexities associated with provisioning voice transport services.
Integrated Voice/Data/Video Broadband Access
Service providers can offer enterprise customers integrated voice-and-data services on a single line (T1/E1, n x T1, or n x E1) with an integrated architecture anchored by the high-density Cisco MGX 8000 Series Carrier Voice Gateway and the unparalleled range of Cisco customer premises equipment (CPE). With Cisco, service providers can build a single network that will enable them to deliver today's voice and data services and eliminate the high cost of disparate voice and data networks.
Basic Voice Transport Services
Service providers with access points spread throughout the world incur huge expenses in interconnecting their points of presence (POPs) using traditional TDM-based voice networks. The Cisco MGX 8000 Series Carrier Voice Gateway utilizes packet-based VoATM AAL2 capabilities to backhaul voice traffic over an ATM network to substantially reduce transport costs.
Wholesale Voice over Packet Call Transport ServicesThe Cisco MGX 8000 Series Carrier Voice Gateways enable service providers to invest in the next generation of voice and data services while providing seamless integration with legacy TDM systems. The Cisco MGX 8000 Series Carrier Voice Gateway, coupled with a softswitch, allows service providers to enjoy a wide range of interconnection protocol options:
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Service providers with existing H.323 and SIP networks can seamlessly expand by incorporating a Cisco MGX 8000 Series Carrier Voice Gateway to serve as a Public Switched Telephone Network (PSTN) gateway for SS7 and PRI interconnections.
Key FeaturesVoice Compression•
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The Cisco MGX 8000 Series Carrier Voice Gateway support for a range of compression techniques allows service providers to select the compression quality and bandwidth savings appropriate for their applications. ADPCM and CS-ACELP compression schemes provide very high-quality, low-bit-rate voice while reducing total bandwidth requirements.
DSP Features
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comfort-noise generation (CNG)•
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(fax and modem up-speeding to G.711 for reliable transfer)•
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Voice Activity Detection
Voice activity detection (VAD) uses the latest DSP techniques to distinguish between silence and speech on a voice connection.
VAD reduces the bandwidth requirements of a voice connection by not generating traffic during periods of silence in an active voice connection. When combined with compression, VAD achieves significant bandwidth savings. Comfort Noise Generation (CNG) is supported on the far end for toll-quality voice.Onboard Echo Cancellation
The Cisco MGX 8000 Series Carrier Voice Gateway uses DSP-based echo cancellation to provide near-end echo cancellation on a per-connection basis. Up to 128 ms of user-configurable near-end delay can be canceled. Onboard echo cancellation reduces equipment cost and potential points of failure, and facilitates high-quality voice connections. The echo canceller complies with ITU-T standards G.164, G.165, and G.168.
Fax and Modem Detection
The Cisco MGX 8000 Series Carrier Voice Gateway continually monitors and detects fax and modem carrier tones. When a carrier tone is detected from a modem or a fax, the channel is upgraded to pulse code modulation (PCM) to ensure transparent connectivity. Fax and modem tone detection ensures compatibility with all voice-grade data connections. The Cisco MGX 8000 Series Voice Gateway also supports standards-based T.38 fax relay.
Regulatory and Tandem Feature Support
The Cisco MGX 8000 Series Carrier Voice Gateway supports the Communications Assistance for Law Enforcement Act (CALEA) requirements, as set forth by the U.S. government. Additionally, support for E-911 and operator services is provided.
Integrated Routing Functionality
The Cisco Route Processor Module (RPM) for the Cisco MGX 8000 Series Carrier Voice Gateway provides support for a wide range of routing protocols and quality of service (QoS) mechanisms that are in use in today's service provider networks. For MPLS-based networks, the RPM provides edge label switch router functionality.
QoS
Cisco voice over packet (VoP) QoS provides a key set of capabilities required by service providers to offer VoP services and to enhance the efficiency of their networks. Cisco also provides a network architecture that has the scalability and performance to operate these services in large-scale IP networks running at very high speeds. This is accomplished via functionality distributed between policy application at the edge of the network and policy enforcement at the core of the network. At the edge, highly granular policies that "color" the customers' packets according to the appropriate business/network policy are defined and applied. At the same time, bandwidth management policies that determine and control how much bandwidth (and for what type of applications) the customers can inject into the network for traffic also are applied. Then, the core becomes responsible for policy enforcement as well as high-speed switching and transport, including tasks such as queuing and congestion control at very high speeds. Cisco also provides the measurements needed for flexible billing, monitoring, and planning for QoS-enabled networks via NetFlow and the various feature Management Information Bases (MIBs). Wrapping up the package together delivers a services platform that can be used by the service providers to both enhance the efficiency of their networks and offer premium, differentiated services tailored to meet market initiatives and customer requirements. Specific VoIP QoS mechanisms available include:
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For VoATM, the Cisco MGX 8000 Series Carrier Voice Gateway supports the following ATM classes of service (CoS):•
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Softswitch Control
The Cisco MGX 8000 Series Carrier Voice Gateway provides open, standards-based interfaces for softswitch control, and can be integrated with both Cisco and third-party softswitches to support a broad array of solutions used without a softswitch for applications such as voice over AAL2 (VoAAL2) trunking.
Network Management
Pure Play Voice SolutionsFor Operation, Administration, Maintenance and Provisioning (OAM&P) functions in a VoIP network, the Cisco Media Gateway Manager (MGM) provides integrated element management for the MGX 8000 Series Carrier Voice Gateways and associated Media Gateway Controllers. The Cisco MGM provides a single element manager that allows the MGX Voice Gateway and Cisco or Partner Media Gateway Controllers to be deployed, operated and maintained as a single system. Based on the Cisco Element Management Framework, Cisco MGM also facilitates CEMF-EMS co-residency with the Cisco MGC Node Manager and Universal Gateway manager. Cisco MGM also provides open northbound interfaces (SNMP and CORBA) for seamless integration with operations support system (OSS) and Network Management Layer applications.
Multiservice, Voice over ATM SolutionsFor Operation, Administration, Maintenance and Provisioning (OAM&P) of the Cisco MGX 8000 Series Carrier Voice Gateway for Multiservice, including VoATM applications, Cisco offers the Cisco WAN Manager. Cisco WAN Manager is a standards-based telecommunications management network and element management system, which also provides open interfaces for seamless integration with operations support systems (OSSs) and third-party management systems.
Technical SpecificationsMechanical ConfigurationCisco MGX 8250 and 8850 Voice Gateways•
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Cisco MGX 8230 Voice Gateway•
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· Two single-height slots reserved for service resource module (SRM)Cisco MGX 8830 Voice GatewaySeven double-height function module slots can also be converted to single-height slots with the addition of mid-rail dividers while the unit is in service:•
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Switching Fabric
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Network Interfaces
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Redundancy
All core components can be configured for 100-percent system redundancy, including the control processor, switching fabric, network interfaces, critical backplane signals, service interfaces, power supplies, and power modules.
Node Synchronization
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Physical Specifications
Cisco MGX 8250 and 8850 Voice Gateways•
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Electrical Specifications
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Electromagnetic Compatibility
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Electrical, Safety, and Standards Compliance
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For additional information on the Cisco MGX 8000 Series Carrier Voice Gateway, please visit:
