Personal Computer-Based Tester for X.21 Networks
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15
The PCTEX is a tool for evaluating X.21 networks and devices. The PCTEX consists of a hardware card which plugs into a PC, PC-XT, or PC-AT and a group of software modules to exercise the hardware card. The hardware card is a standard PC prototype card and consists of 8 communications ports, clock generation logic, interrupt generation logic, and other various logic functions. The logic was built using standard TTL logic and vendor chips. The software consists of a network simulator program (XNS), a test case driver program (XPD), and diagnostics for the hardware. The XNS function simulates an X.21 switched data network. The user defines the network using the menus provided. Once the network has been defined, the user has up to 8 ports which can be used as a switched X.21 network.