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Third-generation 1-, 2-port and 4-port T1/E1 Multiflex Trunk Voice/WAN Interface (MFT VWIC3s) support data and voice applications on the Cisco 1921, 1941 and 1941W (data only), and the Cisco 2901, 2911, 2921, 2951, 3925, 3945, 3925E and 3945E Integrated Services Routers. The Cisco MFT VWIC3 combines WAN-interface-card (WIC) and voice-interface-card (VIC) functions to provide unparalleled flexibility, versatility, and investment protection through its many uses. Customers who choose to integrate data and voice in multiple steps preserve their investment in a T1/E1 WAN interface because the Cisco MFT VWIC3 cards can be reused in packet voice applications. The 2 port T1/E1 MFT VWIC3 is shown below.
The Cisco MFT VWIC3 cards are offered in single-, dual- and quadruple-port versions, which can be used and then redeployed as network requirements change, thereby addressing several applications:
The Cisco 1-, 2- and 4-port T1/E1 MFT VWIC3 versions act as a WIC, supporting T1, fractional T1, E1, (including structured G.703 with G.704 framing), fractional E1, and E1structured G.703 applications. To simplify remote management, these MFT VWIC3 cards integrate a fully managed DSU/CSU for T1 deployments and a fully managed DSU for E1 deployments.
Reduces Networking Lifecycle Costs
• Enables graceful migration from data-only to multiplexed data and voice to packetized voice applications
• Reduces training, deployment, management, and sparing inventory over single-purpose interfaces
• Maximizes investment protection
• Simplifies network configuration and sparing through the support of both T1 and E1 on the same card
• Offers multifunction support for LAN-to-LAN routing, multiplexed data and voice, and packetized voice
• Offers ability to share modules among Cisco 1900, 2900 and 3900 Series routers
• Increases configuration flexibility and reduces cost for data applications by allowing individual ports to be clocked from independent clock sources (not supported for voice applications, since all voice enabled ports must be clocked from a single clock source)
• Supports E1 configurations for both balanced and unbalanced modes
• Supports (G.703 models) unstructured E1 (G.703) for using the full 2.048 Mbps
• Eliminates costly external third-party CSUs/DSUs and drop-and-insert multiplexers
• Simplifies remote network management by allowing a single management tool such as CiscoView or CiscoWorks to support router, CSU/DSU, or drop-and-insert multiplexer
Maximizes System Resources
• Increases T1/E1 port density on the supported Cisco 2911, 2921, 2951, 3925, 3945, 3925E and 3945E integrated services routers-up to four T1/E1 connections with an integrated CSU/DSU in a single EHWIC slot
• Offers easy migration to bandwidth-efficient packet voice, enabling new services
Customers can choose to integrate data and voice in stages to preserve their investment in WAN interfaces. For example, the Cisco MFT VWIC3 can support data-only applications as a WAN interface, and then be reused to integrate data and voice with the drop-and-insert multiplexer function or configured to support packetized voice (voice over IP [VoIP] or voice over Frame Relay [VoFR]).
Packet Voice Solutions: PBX and Central-Office Connectivity
The Cisco MFT VWIC3 interface cards, through its digital T1/E1 ports, supply PBX and public-switched-telephone-network (PSTN) connectivity for integrated services routers with the on-board EHWIC slots. The integrated services routers support H.323-, Session Initiation Protocol (SIP)-, Media Gateway Control Protocol (MGCP)-, and Skinny Client Control Protocol (SCCP)-based VoIP.
Data Solutions: 1- , 2- and 4-Port T1/E1 WIC with Integrated DSU/CSU
The Cisco MFT VWIC3 interface cards simplify branch-office connectivity by integrating the functions of a router, T1/E1, and fractional T1/E1 serial interface with a fully managed DSU/CSU.
When used for "data-only" WAN connectivity, the Cisco MFT VWIC3 cards support numerous functions, including Cisco IOS
Software Command-Line Interface (CLI)-initiated loopback control, similar to the popular 1 Port T1/Fractional T1 DSU/CSU WAN Interface Card (part number HWIC-1DSU-T1. Additionally, the MFT VWIC3 is also offered in quadruple-port versions, enabling increased WAN port density in Cisco 2911, 2921, 2951 and Cisco 3900 Series routers. The T1/E1 MFT VWIC3 versions include integrated DSU functions for E1 deployments and integrated CSU and DSU functions for T1 deployments, simplifying remote network management.
The Cisco 4-port MFT VWIC3 interface cards increase configuration flexibility on Cisco Systems
integrated services routers, eliminating the need for two dual-port T1/E1 HWICs. Increasing the T1/E1 port density in a single EHWIC slot helps enable applications such as local serial aggregation with the 2-port high-speed serial WAN Interface Card (part number HWIC-2T ), or ISDN backup with the 4 Port ISDN BRI S/T WAN Interface Card (part number HWIC-4B-S/T) or the 1 port ISDN with NT-1 WAN Interface Card (part number HWIC-1B-U).
The Cisco MFT VWIC3 cards also support a channelized capability where the T1 or E1 service can be flexibly split into one or two fractional channel groups. Thus a single physical port can provide connection to multiple sites.
The Third-generation 1- and 2-port G.703 Multiflex Trunk voice/WAN Interface Cards (product numbers VWIC3-1MFT-G703 and VWIC3-2MFT-G703) support not only unstructured E1 (G.703) but also all the features of the other Cisco MFT VWIC3 cards, including drop and insert. Additional flexibility is provided on the 2 port G.703 Multiflex Trunk voice/WAN Interface Cards with the capability to configure one port for unstructured E1 (G.703) while configuring the other for standard framed E1.
Multiplexed Data and Voice Solutions: 2- and 4-Port T1/E1 Drop-and-Insert Multiplexer with Integrated DSU/CSU
The Cisco 1-, 2- and 4-port MFT VWIC3 interface cards simplify branch-office connectivity by helping enable Cisco 2900 and 3900 routers to consolidate the functions of a router, a fully managed drop-and-insert multiplexer, and a fully managed DSU/CSU into a single box. (It is possible to use two Cisco 1-port MFT VWIC3 interface cards for supporting the drop-and-insert feature. Generally, a Cisco 2- or 4-port MFT VWIC3 is more appropriate because at least 2 ports are required.) Typically a drop-and-insert multiplexer is used for channelized (that is, TDM) integration of data and voice onto a single T1, fractional T1, E1, or fractional E1 connection to the central office. Sharing a line can significantly reduce costs over those of two separate physical lines to the central office. Although the normal use is for data and voice sharing of a T1 or E1 service, the drop-and-insert capability also can be used for video and data, or data and data sharing of the service.
Moreover, the integrated drop-and-insert capability enhances system availability by allowing the Cisco IOS Software to be reloaded while maintaining TDM switching.
Figure 2. Drop and Insert to Share a T1/FT1 or E1/FE1 Service between Data and TDM
To illustrate, consider the example of a PBX with a T1 interface that needs to support a maximum of 10 simultaneous calls. With 24 DS-0 channels in a T1 service (1.544 Mbps), this leaves 14 DS-0 channels or 896 kbps of bandwidth for data from the router (14 x 64 kbps). The number of DS-0 channels assigned for PBX calls and the remainder that are available for use with router data are fully configurable (statically, not dynamically). In the case of an E1 service, 30 DS-0 channels are available for division between voice and router data.
In this example one port of the Cisco 2-port T1/E1 MFT VWIC3 is connected to the PBX and the other port is connected to the central office. The 10 DS-0 channels from the PBX are TDM switched to the "central-office port," and this switching is done on the MFT VWIC3 itself. The configuration of this TDM switching is flexible so that DS-0 channels on the "PBX port" do not have to be mapped to DS-0 channels with the same time slots on the central-office port. The remaining 14 DS-0 channels on the MFT VWIC3 central-office port terminate through the backplane connector of the VWIC3 on the router as a single aggregate channel group. The 14 DS-0 channels are not individually addressable by the router as a channelized service, but can be split into one or two channel groups.
The drop-and-insert function is included in all the Cisco MFT VWIC3 interface cards. The term "drop and insert" is normally used when router data (or data from another data device) is multiplexed with voice calls. A more generic term for "drop and insert" is "digital cross-connect." For example, a single T1 connection from a PBX to the PBX port on the MFT VWIC3 can be divided between DS-0 channels that are packetized (for example, VoIP) and DS-0 channels that are TDM switched to the central-office port of the MFT VWIC3 for standard circuit-switched voice connectivity.
Cisco 1900 Chassis EHWIC Slots
15.0(1)M3, 15.1(1)T1, 15.1(2)T
Table 2. Cisco MFT VWIC3 Card Feature Comparison
Number of Ports
Unstructured E1 (G.703) Support
Data Support WIC Mode
Voice Support VIC*
Table 4. Part Number and Descriptions of Cisco MFT VWIC3 Cards