... : HWIC-1T Data Link Protocol: RS-232, RS-530, X.21, V.35, RS-449, RS-530A Serial and asynchronous High-Speed WAN Interface Cards ... dial-modem access, low-density WAN aggregation, legacy protocol transport, and high-port-density support.Device Type Expansion module Form Factor ... (Bus) Type HWIC Data Link Protocol RS-232, RS-530, X.21, V.35, RS-449, RS-530A Data Transfer Rate 8 Mbpsyou can ...