Cisco HWIC-1SER= interface cards/adapter

HWIC-1SER=, 1-Port Serial High-Speed WAN Interface Card Cisco serial HWICs provide serial WAN connectivity to remote sites using Cisco High-Level Data Link Control (HDLC), Point-to-Point Protocol (PPP), or Frame Relay encapsulation. These HWICs also support older protocol transport such as Systems Network Architecture (SNA), Synchronous Data Link Control (SDLC) Protocol, Binary Synchronous Communications Protocol (Bisync), and X.25.