A Parallel Channel Port Adapter (PCPA) provides a single channel interface for Cisco 7200 series routers. In some situations, this interface can eliminate the need for a separate front-end processor (FEP). The PCPA contains a bus and tag (also called an original equipment manufacturer's interface [OEMI] and a parallel I/O interface) connector. The PCPA provides a single channel attachment interface for connecting Cisco 7200 series routers to a mainframe bus and tag channel.