Quad channel high-speed serial PMC; RoHS. PMC-HS-SERIAL is a single-wide PMC that provides 4 high-speed asynchronous or synchronous serial channels for space-constrained, high-performance communications applications. A maximum data rate of 10 Mb/s is supported for synchronous protocols using an external clock. Up to 2 Mb/s is supported for asynchronous protocols, with popular baud rates of up to 921.6 Kbaud available using the standard 14.745 MHz oscillator in RS-422 interface mode. Each of the four channels is fully programmable to support many high-performance serial communications protocols, such as synchronous, monosync, bisync, HDLC, SDLC, LAPB, LAPD, ISDN, and PPP.