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The dual Asynchronuous/Synchronous serial port interface card provides higher levels of serial port density for a single WAN interface card and is supported on the Cisco 2600 and 1720 series. The low serial speed interface card supports up to 128Kbps synchronous or 115.2 Kbps asynchronous serial links. Each port can be configured independent of the other allowing support for different physical interfaces (protocol and DTE/DCE). The card supports mixed asynchronous and synchronous operation as well.
The dual-serial port WAN interface card features Cisco's new, compact, Smart Serial connectors to support a wide variety of electrical interfaces when used with the appropriate transition cable. This includes: V.35, RS-232, RS-449, RS-530, RS-530A in male and female versions for both DCE and DTE devices. This feature provides easy configuration and re-configuration as network requirements change without the need of purchasing a different serial interface card. Two cables are required to support the two ports on the WIC.