X.25 over TCP/IP (XOT) RFC 1613 Cisco-XOT LayGO Client

Since branch offices are far more numerous than mainframe sites, the elimination of the X.25 hardware at these sites results in large cost savings and increased line speed. With the X.25 PLP data encapsulated into TCP/IP, the X.25 packets can be extracted and processed in an X.25 PLP module.

LayGO XOT Client

(Click to enlarge) LayGO XOT Client Protocol Stack Diagram

At the receiver, the X.25 packets are routed to the lower edge of the packet layer using the LayGO Return Layer. They are then decoded as if they had arrived from the LAPB or LAPD layer. At the transmitter, the X.25 packets are routed from the lower edge of the X.25 packet layer to the XOT client using the LayGO Return Layer. The XOT client also emulates the LCN0 traffic. The LayGO application is unaware that XOT is used. In addition to XOT, RPC can be used to support multiple local or remote simultaneous processes.