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The 1-port and 2-port T1 Multi-Flex Trunk VWICs are not like the T1 channel service unit/data service unit (CSU/DSU) (WIC-1DSU-T1). The T1 Multi-Flex Trunk VWICs are can transmit either voice and data or both based on the network module they are installed in and whether Digital Signal Processors (DSPs) exist on the module.

This Multi-Flex Trunk can be used as a Voice Interface Card when combined with appropriate accompanying hardware (such as an NM-HDV, NM-HDV2, an NM-HD-2VE, or an AIM-VOICE-30 and AIM-ATM-VOICE-30 card), or as a WIC (in a WIC slot in the 2600 or 3600). Therefore, it is a Voice WAN Interface Card (VWIC).

The Multi-Flex Trunk provides physical layer T1 access. The capabilities of that T1 interface are determined by the host it is plugged into.

This Multi-Flex Trunk card does not support ISDN data or modem termination in a traditional Network Access Server (NAS) dial scenario. Under specific scenarios, ISDN data and modem connectivity can be possible when the VWIC is used for packet voice, such as in the case of Modem Pass-through and Modem Relay to a peer voice gateway. Such features are beyond the scope of this document.

Note: On the 2-port T1 Multiflex Trunk VWICs there is only one shared clocking domain between the two T1 controllers. This means that if both T1 controllers are configured to derive clocking from the line then the clock references received must be synchronous or timing slips occur on at least one of the controllers. If the clocking sources are pleisochronous and one controller is configured for clock source line primary and the other for clock source line, then it is likely the second controller will exhibit controlled slips in the output of the show controllers T1 command. This behavior is a hardware limitation of the 2-port T1 Multi-Flex Trunk VWIC product and is by design. However, independent clocking sources can be supported on the 2-port T1/E1 VWIC2 product when both controllers are used for data-only purposes.