Cisco Interface Cards are classified according to the technologies they support. For example, WAN interface cards (WICs) support WAN technologies, such as Gigabit Ethernet; and voice interface cards (VICs) support voice technologies. Voice/WAN interface cards (VWICs) can support voice, data, and voice and data applications, depending on the capabilities of the router in which the VWIC is installed. Enhanced High-speed WAN interface cards (EHWIC) provide expanded LAN and WAN capabilities, such as Gigabit Ethernet and Ethernet switching.
Cisco WAN Interface Cards and Voice Interface Cards
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Cisco 2-Port FXS Voice Interface Card (VIC-2FXS)
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Cisco 4-Port FXO Voice Interface Card (VIC2-4FXO)
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Cisco T1 DSU CSU WAN Interface Card (CSOT1WANIC-REF)
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Cisco VIC3-2FXS/DID 2-Port Voice Interface Expansion Card
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Cisco VWIC3-1MFT T1/E1 Interface Card
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